Sony hcd-gtx88

1
Ver. 1.0 2007. 06
Model Name Using Similar Mechanism NEW
CD
CD Mechanism Type CDM74KF-K6BD91UR-WOD//M
Section
Optical Pick-up Name KSM-213DCP/C2NP
Tape Deck
Model Name Using Similar Machanism HCD-GN1100D
Section
SERVICE MANUAL E Model
Australian Model
HCD-GTX88
Amplifier section
Brazil model only
The following are measured at
AC 127 V or 220 V, 50/60 Hz
Front/Surround speaker
RMS output power: 205 W + 205 W
(at 8 Ω, 1 kHz, 10% THD)
Subwoofer
RMS output power: 130 W + 130 W
(at 6 Ω, 100 Hz, 10% THD)
Other models
The following are measured at
Mexican model: AC 127 V, 60 Hz
Other models: AC 120, 220, 240 V, 50/60 Hz
Front/Surround speaker
Power Output (rated): 175 W + 175 W
(at 8 Ω, 1 kHz, 1% THD)
RMS output power (reference):
255 W + 255 W
(per channel at 8 Ω, 1 kHz,
10% THD)
Subwoofer
RMS output power (reference):
130 W + 130 W
(at 6 Ω, 100 Hz, 10% THD)
SPECIFICATIONS
Inputs
VIDEO (AUDIO IN) L/R:
Voltage 250 mV,
impedance 47 kilohms
AUDIO (AUDIO IN) L/R:
Voltage 450 mV,
MIC: Sensitivity 1 mV,
(USB) port: Type A
Outputs
PHONES: accepts headphones of
8 ohms or more
Disc player section
System Compact disc and digital
audio system
Laser Semiconductor laser
(λ=770 – 810 nm)
Emission duration:
continuous
Laser Output Max. 44.6 µW*
* This output is the value measured
at a distance of 200 mm from the
objective lens surface on the Optical
Pick-up Block with 7 mm aperture.
Sony Corporation
Personal Audio Division
Published by Sony Techno Create Corporation
9-887-753-01
2007F04-1
© 2007. 06
– Continued on next page –
CD DECK RECEIVER
• HCD-GTX88 is the tuner, deck,
CD and amplifier section in
MHC-GTX88.

2
HCD-GTX88
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
Frequency response 20 Hz – 20 kHz
Wave length 770 – 810 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 88 dB
Tape deck section
Recording system 4-track 2-channel stereo
Frequency response 50 – 13,000 Hz (±3 dB),
using Sony TYPE I tape
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
Brazil model: 87.5 – 108.0 MHz
(100 kHz step)
Other models: 87.5 – 108.0 MHz
(50 kHz step)
Antenna FM lead antenna
Antenna terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
Latin American and Oceanian models:
530 – 1,710 kHz (with the
interval set at 10 kHz)
Other models: 531 – 1,602 kHz (with the
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
USB section
Supported bit rate MP3 (MPEG 1 Audio Layer 3):
32 – 320 kbps, VBR
Sampling frequencies MP3 (MPEG 1 Audio Layer 3):
32/44.1/48 kHz
Transfer speed Full-Speed
Supported USB device Mass Storage Class
Maximum current 500 mA
General
Power requirements
Mexican model: 127 V AC, 60 Hz
Brazil model: 127 V or 220 V AC, 50/60 Hz,
Adjustable with voltage
selector
Oceanian model: 230 – 240 V AC, 50/60 Hz
Argentina model: 220 V AC, 50/60 Hz
Other models: 120 V, 220 V or 230 – 240 V AC,
50/60 Hz, adjustable with
voltage selector
Power consumption 430 W
Dimensions (w/h/d) (Approx.)
281 × 361 × 417 mm
Mass (Approx.) 14.2 kg
Design and specifications are subject to change without
notice.

3
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
HCD-GTX88
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
Notes on Chip Component Replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270°C during
repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to about
350 °C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may also
be added to ordinary solder.
This appliance is
claassified as a CLASS 1
LASER product. This
label is located on the
rear exterior.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.

4
HCD-GTX88
MODEL IDENTIFICATION
– MODEL NUMBER LABEL –
MODEL PARTS No.
GTX88: E2 3-113-126-0s
GTX88: E51 3-198-009-0s
GTX88: AUS 3-197-997-0s
GTX88: AR 3-198-001-0s
• Abbreviation
E2 : 120V AC area in E model
E51 : Chilean and Peruvian model
AR : Argentina model
AUS : Australian model
PART No.

5
TABLE OF CONTENTS
HCD-GTX88
1. GENERAL
Guide to parts and controls ...................................................... 6
2. DISASSEMBLY
2-1. Case (Top) ......................................................................... 13
2-2. Loading Panel.................................................................... 13
2-3. Tuner Pack ......................................................................... 14
2-4. CD Block Section.............................................................. 14
2-5. Front Panel Section ........................................................... 15
2-6. Tape Mechanism Deck, Mic Board,
USB Connector Board ....................................................... 15
2-7. Panel Board, Function Board, Jog Board .......................... 16
2-8. CD-SW Board ................................................................... 16
2-9. Cover (CDM) .................................................................... 17
2-10. Back Panel Section ............................................................ 17
2-11. Power Board Section ......................................................... 18
2-12. Main Board ....................................................................... 18
2-13. Subwoofer Board, Power Board........................................ 19
2-14. Power Transformer (T1200) .............................................. 19
2-15. BD91 Board ...................................................................... 20
2-16. Driver Board, SW Board, USB Board .............................. 20
2-17. Optical Pick-up ................................................................. 21
2-18. Sensor Board ..................................................................... 21
2-19. Motor (TB) Board ............................................................. 22
2-20. Motor (LD) Board ............................................................. 22
3. TEST MODE ..................................................................... 23
4. MECHANICAL ADJUSTMENTS ............................... 27
5. ELECTRICAL ADJUSTMENTS................................. 28
6. DIAGRAMS
6-1. Block Diagram — RF/Servo Section — ........................... 31
6-2. Block Diagram — Tape/Tuner Section — ........................ 32
6-3. Block Diagram — Main Section — .................................. 33
6-4. Block Diagram — USB Section — .................................. 34
6-5. Block Diagram — AMP/Subwoofer Section — ............... 35
6-6. Block Diagram — Display/Power Section — .................. 36
6-7. Circuit Boards Location .................................................... 37
6-8. Printed Wiring Board — BD91 Section — ....................... 40
6-9. Schematic Diagram — BD91 Section —.......................... 41
6-10. Printed Wiring Boards — Driver Section —..................... 42
6-11. Schematic Diagram — Driver Section — ......................... 43
6-12. Schematic Diagram — Main Section (1/4) — .................. 44
6-16. Printed Wiring Board — Main Section — ........................ 48
6-17. Printed Wiring Board — USB Connector Section — ....... 49
6-18. Schematic Diagram — USB Connector Section — .......... 49
6-19. Printed Wiring Board — USB Section —......................... 50
6-20. Schematic Diagram — USB Section — ........................... 51
6-21. Printed Wiring Board — Effector Section — ................... 52
6-22. Schematic Diagram — Effector Section — ...................... 53
6-23. Printed Wiring Board — Panel Section —........................ 54
6-24. Schematic Diagram — Panel Section — .......................... 55
6-25. Printed Wiring Boards — Function Section —................. 56
6-26. Schematic Diagram — Function Section — ..................... 57
6-27. Printed Wiring Board — Power Amp Section — ............. 58
6-28. Schematic Diagram — Power Amp Section — ................ 59
6-29. Printed Wiring Board — Subwoofer Section — ............... 60
6-30. Schematic Diagram — Subwoofer Section —.................. 61
6-31. Printed Wiring Boards — Trans Section — ...................... 62
6-32. Schematic Diagram — Trans Section — .......................... 63
7. EXPLODED VIEWS
7-1. Main Section ..................................................................... 78
7-2. Front Panel Section (1)...................................................... 79
7-5. Chassis Section ................................................................. 82
7-6. CD Mechanism Section (1) ............................................... 83
7-7. CD Mechanism Section (2) ............................................... 84
8. ELECTRICAL PARTS LIST ........................................ 85

6
HCD-GTX88
SECTION 1
GENERAL This section is extracted
from instruction manual.
6GB
Guide to parts and controls
This manual mainly explains operations using the buttons on the unit, but the same
operations can also be performed using the buttons on the remote having the same or
similar names.
Unit
– Front view
– Top view
qdqfqgqh
1 2 3 4
5
6
qj
qk
ql
w;
wa
ws
wd
wf
7
8
9
q;
qa
qs
wkwj wgwh

7
HCD-GTX88
7GB
Guidetopartsandcontrols
1 FLANGER (pages 35, 43, 48)
DELAY (pages 35, 43, 48)
CHORUS (pages 36, 43, 48)
SOUND FLASH (page 35)
Press to create a party atmosphere.
B Display (pages 9, 38, 39, 48)
C SURROUND SPEAKER MODE
(MHC-GTX88 only) (page 34)
Press to select the sound system.
SURROUND
(MHC-GTX77/MHC-GTX66 only)
(page 34)
Press to select the surround effect.
D Disc tray (pages 9, 17, 44, 48)
E AMP MENU (page 38)
Press to change the spectrum
analyser display or to adjust the
brightness of the display.
F RETURN (pages 17, 25)
Press to return to the parent folder.
G NX (play/pause) (pages 17, 22,
24, 30, 44)
Press to start or pause playback.
x (stop) (pages 17, 23, 25, 28,
29, 30, 32, 44)
Press to stop playback or recording.
./> (go forward/go
backward) (pages 17, 20, 23, 25,
27, 31, 48)
Press to select a track.
TUNING +/– (pages 28, 29)
Press to tune in a radio station.
+/– (pages 17, 20, 23, 25, 27,
31)
Press to select a folder.
m/M (rewind/fast forward)
(page 30)
Press to fast forward or rewind.
H CD- SYNC/REC 1 (page 22)
Press to record from a disc onto the
connected optional USB device
(Digital music player or USB storage
media).
CD-TAPE SYNC (page 31)
TAPE REC PAUSE/START
(page 31)
Press to record onto a tape.
I PUSH OPEN/CLOSE Z (Deck B)
(page 30)
Press to insert or eject a tape.
Deck B (pages 30, 31, 37, 48)
J ENTER (pages 23, 29, 33, 48)
Press to enter the selection.
K ERASE (page 23)
Press to erase MP3 audio tracks or
folders on the connected optional
USB device (Digital music player or
USB storage media).
L MASTER VOLUME (pages 17,
24, 39, 43)
Turn to adjust the volume.
M MIC (jack) (pages 36, 43, 52)
Connect an optional microphone.
MIC LEVEL (pages 32, 36, 43)
Turn to adjust the microphone
volume.
USB
Continued l

8
HCD-GTX88
8GB
N REC/ERASE (indicator)
(pages 23, 25)
Lights up when recording from a disc
onto the connected optional USB
device (Digital music player or USB
storage media).
Lights up when erasing MP3 audio
tracks from the connected optional
USB device (Digital music player or
USB storage media).
O (USB) port (pages 22, 23,
24, 41, 52)
Connect an optional USB device
(Digital music player or USB storage
media).
P PHONES (jack) (pages 43, 52)
Connect the headphones.
Q Power illuminator (pages 35, 39)
R PRESET EQ (page 33)
Press to select a preset sound effect.
S Z PUSH OPEN/CLOSE (Deck A)
(page 30)
Press to insert or eject a tape.
Deck A (pages 30, 48)
T Function buttons:
CD (pages 14, 17, 22, 29, 31, 38)
TUNER/BAND (pages 29, 38)
TAPE A/B (pages 30, 38)
AUDIO (pages 38, 41)
VIDEO (pages 38, 41)
(pages 23, 24, 26, 38)
Press to select a function.
U "/1 (on/standby) (pages 13, 14,
29, 43, 48)
Press to turn the system on or off.
V GROOVE (page 33)
Press to reinforce the bass.
W IR Receptor (page 43)
X EQ BAND/MEMORY (page 33)
Press to select a frequency band
when adjusting the graphic
equalizer.
Y DISPLAY (pages 38, 39, 40)
Press to change the information in
the display.
Z OPERATION DIAL (pages 17,
25, 33, 35, 38)
Turn to select a track or folder.
Turn to select a setting.
wj ILLUMINATION (page 39)
Press to change the power
illuminator pattern.
wk DISC SKIP/EX-CHANGE
(pages 14, 17, 18, 20)
Press to skip a disc.
Press to exchange other discs during
playback.
Z OPEN/CLOSE (pages 14, 17,
44)
Press to load or eject a disc.
DISC 1 ~ 3 (pages 18, 20)
Press to select a disc.
Press to switch to CD function from
other function.
USB

9
HCD-GTX88
9GB
– Display
A Lights up when the USB function is
selected (page 24).
B “MP3” lights up when an MP3 audio
track is recognized. “CD” lights up
when a disc is recognized.
C Indicates the type of MP3 audio track
information that displayed (page 39).
“ ” lights up when a track name is
displayed. “ ” lights up when an
artist name is displayed. “ ” lights
up when a folder name is displayed.
D Indicates the tuner band (page 28).
E Lights up when the MP3 audio track
contains ID3 tag information.
F Displays the current status and
information (page 39).
G Indicators for the TUNER function
(page 28).
H Lights up when the Play Timer or
Recording Timer is set (page 37).
I Lights up when the Sleep Timer is
activated (page 37).
J Lights up during recording (pages 22,
31).
K Indicators for the TAPE function
(page 30).
“ ” and “ ” lights up when the
system is turned on.
“ ” lights up when there is a tape in
the deck.
L Lights up when an optional USB
device (Digital music player or USB
storage media) is recognized
(page 22).
M Indicates the selected play mode
(pages 19, 26).
N Indicators for the disc tray (page 17).
“ ” lights up when the disc is
selected. “ ” lights up when there is
a disc on the disc tray. “1”, “2” and
“3” light up when the system is turned
on.
O Indicates the activated sound effect
(pages 33, 35).
Note
“LINK”, “MATRIX SUR 1” and
“MATRIX SUR 2” light up for
MHC-GTX88 only.
FM AM ID3 AUTO PRESET ST
MONO
MHz
kHz
TUNED
REC
PLAY
SLEEP
CD
USB
MP3 BOOSTER
SUR
FLANGER CHORUS DELAY
MATRIX SUR 12
LINK
Z GROOVE
SHUF TAPE USB
USB MEMORY
PGM
ALL 1 DISCS
REP 1
SYNC
A B1 2 3
qa q;qs
432 5 6 7 81
9qdqfqg
MP3
REC
A B
Continued l

10
HCD-GTX88
10GB
Subwoofer A (SS-WG88A)
1 SUBWOOFER ON/OFF
(page 13)
Press to turn the subwoofer on or off.
2 SUBWOOFER LEVEL (page 13)
Turn to adjust the subwoofer level.
Remote
1 "/1 (on/standby) (pages 13, 16,
43)
Press to turn the system on or off.
B CLOCK/TIMER SELECT
(page 38)
CLOCK/TIMER SET (pages 16,
37)
Press to set the clock and the timers.
C REPEAT/FM MODE (pages 21,
27, 29, 47)
Press to change the Repeat Play
setting.
Press to select the FM monaural or
stereo reception.
D USB (page 24)
Press to select the USB function.
CD (page 17)
Press to select the CD function.
TUNER/BAND (page 28)
Press to select the TUNER function.
Press to select FM or AM band.
FUNCTION (pages 30, 41)
Press to select a function.
2
1
q;
qa
qs
qd 3
4
5
2
6
7
9
8
qf
1qg

11
HCD-GTX88
11GB
E ./> (go forward/go
backward) (pages 17, 20, 23, 25,
27, 31, 37, 48)
Press to select a track.
+/– (tuning) (pages 28, 29)
Press to tune in a radio station.
m/M (rewind/fast forward)
(pages 17, 25, 30)
Press to find a point in a track.
(play) (pages 17, 24, 30, 44)
X (pause) (pages 17, 30)
x (stop) (pages 17, 25, 28, 30,
32)
Press to start, pause or stop playback.
F ENTER (pages 16, 23, 28, 33,
37)
Press to enter the selection.
G DISC SKIP (pages 18, 20)
Press to skip a disc.
H +/– (pages 17, 20, 23, 25, 27,
31)
Press to select a folder.
I VOLUME +/–* (pages 17, 24, 39,
43)
Press to adjust the volume.
* The VOLUME + button has a tactile dot.
Use the tactile dot as a reference when
operating the system.
J EQ (page 33)
Press to select a preset sound effect.
K CLEAR (pages 21, 27)
Press to delete a pre-programmed
track.
L PLAY MODE/TUNING MODE
(pages 19, 26, 28, 29, 44)
Press to select the play mode of CD
or USB function.
Press to select the tuning mode.
qd TUNER MEMORY (page 28)
Press to preset a radio station.
qf DISPLAY (pages 38, 39, 40)
Press to change the information on
the display.
qg SLEEP (page 37)
Press to activate the Sleep Timer.

12
HCD-GTX88
SECTION 2
DISASSEMBLY
Note : Disassemble the unit in the order as shown below.
2-19. MOTOR (TB) BOARD
(Page 22)
2-20. MOTOR (LD) BOARD
(Page 22)
2-1. CASE (TOP)
(Page 13)
2-2. LOADING PANEL
(Page 13)
SET
2-3. TUNER PACK
(Page 14)
2-16. DRIVER BOARD,
SW BOARD,
USB BOARD
(Page 20)
2-15. BD91 BOARD
(Page 20)
2-17. OPTICAL PICK-UP
(Page 21)
2-4. CD BLOCK SECTION
(Page 14)
2-10. BACK PANEL SECTION
(Page 17)
2-5. FRONT PANEL SECTION
(Page 15)
2-18. SENSOR BOARD
(Page 21)
2-9. COVER (CDM)
(Page 17)
2-11. POWER BOARD SECTION
(Page 18)
2-13. SUBWOOFER BOARD,
POWER BOARD
(Page 19)
2-14. POWER TRANSFORMER
(T1200)
(Page 19)
2-12. MAIN BOARD
(Page 18)
2-6. TAPE MECHANISM DECK,
MIC BOARD,
USB CONNECTOR BOARD
(Page 15)
2-8. CD-SW BOARD
(Page 16)
2-7. PANEL BOARD,
FUNCTION BOARD,
JOG BOARD
(Page 16)

13
HCD-GTX88
2-2. LOADING PANEL
Note : Follow the disassembly procedure in the numerical order given.
2-1. CASE (TOP)
1 screw
(case 3 TP2)
6 screw
(case 3 TP2)
2 two screws
(case 3 TP2)
7 two screws
(case 3 TP2)
4
9
qs
3 two screws
(+BVTP 3 × 10)
8 two screws
(+BVTP 3 × 10) qa two screws
(+BVTP 3 × 10)
qd case (top)
5 panel (side-R)
0 panel (side-L)
3 loading panel
2 Pull-out the disc tray.
1 Turn the pulley to the direction of the arrow.
pulley
Front panel side
CD mechanism deck (CDM74KF)

14
HCD-GTX88
2-3. TUNER PACK
2-4. CD BLOCK SECTION
3 tuner pack
2 wire (flat type) (9 core)
(CN1)
1 two screws
(+BVTP 3 × 8)
1 screw
(+BVTP 3 × 8)
5 three screws
(+BVTP 3 × 12)
2 lug
3 tapping screw
4 tapping screw
(CN701)
qs CD block section
7
(CN5053)
0 CN903 (5P)
qa CN901 (2P)
(CN5051)

15
HCD-GTX88
2-6. TAPE MECHANISM DECK, MIC BOARD, USB CONNECTOR BOARD
2-5. FRONT PANEL SECTION
0 front panel section
3
2 three screws
(+BVTP 3 × 8)1 three screws
(+BVTP 3 × 8)
(CN508)
(CN509)
7 CN503 (3P)
8 CN507 (8P)
9 CN903 (3P)
6 CN100 (4P)
1 three screws
(+BVTP 2.6 (3CR))
2 three screws
(+BVTP 2.6 (3CR))
5 two screws
(+BVTP 2.6 (3CR))
7 two screws
(+BVTP 2.6 (3CR))
9 two screws
(+BVTP 2.6 (3CR))
0 USB CONNECTOR board
bracket (MIC shield)
8 MIC board
6
3 tape mechanism deck
4 knob (MIC)

16
HCD-GTX88
2-7. PANEL BOARD, FUNCTION BOARD, JOG BOARD
2-8. CD-SW BOARD
2 two screws
(+BVTP 2.6 (3CR))
3 two screws
(+BVTP 2.6 (3CR))
8 five screws
(+BVTP 2.6 (3CR))
9 four screws
(+BVTP 2.6 (3CR))
0 six screws
(+BVTP 2.6 (3CR))
qj three screws
(+BVTP 2.6 (3CR))
4 PANEL board
qa PANEL board
qs knob (volume)
qd nut
qf holder (jog)
qg knob jog assy
qh gear (encoder)
qk JOG board
1 CN956 (2P) 6 CN905 (2P)
7 CN904 (3P)
(CN900)
2
1 two screws
(+BVTP 2.6 (3CR))
3 two screws
(+BTTP (M2.6))
4 three screws
(+BTTP (M2.6))
5 CD-SW board
6 escucheon (CD)

17
HCD-GTX88
2-10. BACK PANEL SECTION
2-9. COVER (CDM)
1 two screws
(+BVTP 3 × 10)
3 cover (CDM)
CD mechanism deck
2 screw
(+BVTP 3 × 10)
5 four screws
(+BVTP 3 × 10)
7 two screws
(+BVTP 3 × 10)
8 three screws
(+BVTP 3 × 10)
6 two screws
(+BVTP 3 × 10)
(CN1502)
1 CN1200 (3P)
2 CN1204 (4P)
3 CN1202 (2P)
9 CN580 (3P)
0 back panel section

18
HCD-GTX88
2-11. POWER BOARD SECTION
2-12. MAIN BOARD
2 two screws
(+BV3 (3-CR))
7 two screws
(+BV3 (3-CR))
8 screw
(+BV3 (3-CR))
9 screw
(+BV3 (3-CR))
3 DC fan(M892)
6 three screws
(+BVTP 3 × 10)
0 two screws
(+BVTP 3 × 10)
qa POWER board section
1 CN581 (3P)
4 CN1214 (6P)
5 CN1212 (7P)
1 screw
(+BVTP 3 × 10)
2 MAIN board
POWER board assy
CN600
CN601
CN700

19
HCD-GTX88
2-14. POWER TRANSFORMER (T1200)
2-13. SUBWOOFER BOARD, POWER BOARD
1 two screws
(transistor)
9 two screws
(transistor)
qd screw
(+BVTP 3 × 10)
qf bracket
qg POWER board
qs heat sink assy
6 two screws
(+BVTP 3 × 8)
7 holder
2 two screws
(+BVTP 3 × 10)
8 two screws
(+BVTP 3 × 10)0 two screws
(+BVTP 3 × 10)
qa
5 CN607 (5P)
4 SUBWOOFER board
3 screw
(+BV3 (3-CR))
2 two screws
(+BV3 (3-CR))
7 three screws
8 power transfomer (T1200)
TRANS board
6 three screws
3 DC fan(M892)
4 CN1214 (6P)
5 CN1212 (7P)
1 CN581 (3P)

20
HCD-GTX88
2-15. BD91 BOARD
2-16. DRIVER BOARD, SW BOARD, USB BOARD
3 BD91 board
2 Remove the four solders.
(CN301)
2 CN703 (4P)
3 CN704 (2P)
5 DRIVER board
7 SW board
1 two screws
(+BVTT (M2.6))
6 screw
(+BVTT (M2.6))
8 two screws
(+BVTP2.6 (3CR))
9 USB board
(CN702)

21
HCD-GTX88
2-17. OPTICAL PICK-UP
2-18. SENSOR BOARD
3 two coil springs
(insulator)5 two coil springs
(insulator)
4 two insulators
6 two insulators
7 optical pick-up
(BU-K6BD91UR)
1 two floating screws
(+PTPWH M2.6)
2 two floating screws
(+PTPWH M2.6)
2 tray
3 belt (table)
5 pulley (table)
8 screw
(+BTTP (M2.6))
0 SENSOR board
7 gear (geneva)
9 CN731
(3P)
1 floating screw
(+PTPWH M2.6)
6 floating screw
(+PTPWH M2.6)
4 floating screw
(+PTPWH M2.6)

22
HCD-GTX88
2-19. MOTOR (TB) BOARD
2-20. MOTOR (LD) BOARD
6 Remove the two solderings of motor.
8 MOTOR (TB) board
7 table motor assy (M741)
5 two screws
(+BTTP (M2.6))
4
1 stopper
2 stopper
table
(CN742)
2 Remove the two solderings of motor.
4 MOTOR (LD) board
1 belt (loading)
5 loading motor assy (M751)
3 two screws
(+BTTP (M2.6))

23
HCD-GTX88
SECTION 3
TEST MODE
4. When the [MASTER VOLUME] knob is turned clockwise even
slightly, the sound volume increases to its maximum and a
message “VOLUME MAX” appears on the fluorescent indicator
tube.
5. When the [MASTER VOLUME] knob is turned counter-clockwise
even slightly, the sound volume decreases to its minimum and a
message “VOLUME MIN” appears on the fluorescent indicator
tube.
* Tape function
1. Insert a tape in dack B. The function is changed to VIDEO
automatically when the recording is started by pressing [CD-
TAPE SYNC] then press [TAPE REC PAUSE/START] button.
During recording theALC (Automatic Logic Control) is turned
on.
2. During recording, press m button will stop the recording
and the function is changed to TAPE B and rewind the tape in
Deck B until the recording start position and playback of the
tape in Deck B is started. If the [TAPE REC PAUSE/ START]
button is pressed for a pause and pressed again to resume
recording during recording time, when the tape is rewind, the
tape will be rewind until the position where the pause is applied.
* To release from MC Test mode
1. To release from this mode, press ?/1 button.
2. The cold reset is enforced at the same time.
[COLD RESET]
• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
1. Press ?/1 button to turn on the system.
2. Press x button, [ENTER] button and ?/1 button
simultaneously.
3. The message “COLD RESET” appears on the fluorescent
indicator tube. Then, the fluorescent indicator tube becomes
blank for while, and the set is reset.
[VACS ON/OFF]
• This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
2. Press x button and [ILLUMINATION] button simultaneously.
The message “VACS OFF” or “VACS ON” appears on the
fluorescent indicator tube.
[TUNER STEP CHANGE]
• The step interval of AM channels can be toggled between 9 kHz
and 10 kHz.
This mode is not available for Saudi Arabia model.
Procedure:
2. Press [TUNER/BAND] button repeatedly to select the “AM”.
3. Press ?/1 button to turn off the system.
4. Press [ENTER] button and ?/1 button simultaneously. The
system will turn on automatically. The message “AM 9K STEP”
or “AM 10K STEP” appears on the fluorescent indicator tube
and thus the channel step is changed.
[GC TEST MODE]
• This mode is used to check the fluorescent indicator tube, LEDs,
buttons, MASTER VOLUME knob, OPERATION DIAL knob,
model, destination, software version.
Procedure:
1. Press x button, [ENTER] button and [DISC 2] button
simultaneously.
2. All LEDs and segments in fluorescent indicator tube are lighted
up.
All LEDs are lighted up in red color except for NX LED
where the LED is lighted up in green color.
3. When you want to enter to the model version and destination
display mode, press [DISC 1] button. The model information
appears on the fluorescent indicator tube.
4. Each time [DISC 1] button is pressed, the display changes to
display software version and date of the software creation. The
sequence is MC version, GC version, SYS version, CD version,
CDDM version, CDMA version, CDMB version, BDA version,
BDB version, ST version, TC version, TA version, TM version,
MM1 version and MM2 version in this order, and returns to the
model version display.
5. Press [DISC 2] button, the key check mode is activated.
6. In the key check mode, the fluorescent indicator tube displays
“K 0 J0 V0”.
Turn the [OPERATIONAL DIAL] clockwise; “J” value increases
by one. Turn the [OPERATIONAL DIAL] counterclockwise; “J”
value decreases by one. Each time a button is pressed, “K” value
increases. Press other keys on main unit to check whether the
key is detected. However, once a button has been pressed, it is
no longer taken into account.
“V” value increases in the manner of 0, 1, 2, 3 ... if [MASTER
VOLUME] knob is turned clockwise, or it decreases in the manner
of 0, 9, 8, 7 ... if [MASTER VOLUME] knob is turned
counterclockwise.
7. When [DISC SKIP/EX-CHANGE] button is pressed after all LEDs
and segments in fluorescent indicator tube light up, alternate
segments in fluorescent indicator tube and LED would light up.
If you press [DISC SKIP/EX-CHANGE] button again, another half
of alternate segments in fluorescent indicator tube and LEDs
would light up. Pressing [DISC SKIP/EX-CHANGE] button again
would cause all LED and segments lights up.
8. To release from this mode, press three buttons in the same
manner as step 1, or disconnect the power cord.
[MC TEST MODE]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner and Tape.
Procedure:
• To enter MC Test Mode
simultaneously.
2. The CD ring indicators and TAPE A and B indicators flash on
the fluorescent indicator tube. The function is changed to
VIDEO.
* Check of Amplifier
1. Press [EQ BAND/MEMORY] button repeatedly until a message
“GEQ MAX” appears on the fluorescent indicator tube. GEQ
increases to its maximum.
“GEQ MIN” appears on the fluorescent indicator tube. GEQ
decreases to its minimum.
“GEQ FLAT” appears on the fluorescent indicator tube. GEQ
is set to flat.

24
HCD-GTX88
[CD SERVICE MODE]
• This mode let you move the CD sled motor freely. Use this mode
when you want to clean the optical pick-up.
Procedure:
2. Select CD function.
3. Press x button, [ENTER] button and [OPEN/CLOSE] button
simultaneously.
4. The CD service mode is activated. The message “SERVICE
MODE” appears on the fluorescent indicator tube.
5. With the CD in stop status, press M to move the optical
pick-up to outside track, or turn m to move to inside track.
The message “SLED OUT” or “SLED IN” appears on the
6. To turn on or off the laser, press [FLANGER] button. The message
“LD ON” or “LD OFF” appears on the fluorescent indicator
tube.
7. To release from this mode, press ?/1 button to turn off the
system.
[CD AGING MODE]
• This mode can be used for operation check of CD section. If an
error occurs, the aging operation would stops and the status is
displayed. If there were no error occurs, the aging operation
would continue repeatedly.
Procedure:
3. Load three discs on disc tray.
4. Press [PLAY MODE/TUNING MODE] button on the remote control
repeatedly to select the “ALL DISCS” mode, and press the
[REPEAT/FM MODE] button on the remode control repeatedly
to select repeat mode off.
5. Press x button, [ENTER] button and [DISC SKIP/EX-CHANGE]
button simultaneously.
6. Aging operation is started.
7. To release from this mode, press ?/1 button or disconnect the
power cord to turn the power OFF.
• Aging mode sequence:
DISC CHUCKING
TOC READING
PLAY FIRST TRACK FOR 2
SECONDS
OPEN THE DISC TRAY
DISC SKIP
CLOSE THE DISC TRAY
START
PLAY LAST TRACK FOR 2
SECONDS
EX-CHANGE OPEN/CLOSE
CHANGE THE NEXT DISC

25
HCD-GTX88
[CD ERROR CODE MODE]
• Display the CD error code when an error occurred.
Procedure:
simultaneously to enter the error code display mode.
2. The fluorescent indicator tube display the number of total error.
3. Each time m button and M button are turned, display
change as below.
%% : The process when trouble occurs
01 : Process ejecting DISC
02 : Process waiting for inserting DISC
03 : Process sending request to insert a disc to upper
layer.
04 : Process sending request to eject a disc to upper
layer.
05 : Process pulling a DISC in.
06 : Chucking process
07 : Re-chucking process
08 : Process cancelling chucking
&& : The operation when trouble occurs
00 : Waiting for operation.
10/11/12/13: During eject operation
20 : While pulling a disc in
30 : While cancelling chucking
40/41/42/43: During eject operation due to error.
0000 : Not used (Value is fixed to 0000).
• Display of BD error. It is shown with “D” and 11 digits
number.
DISPLAY OF
TOTAL ERROR
DISPLAY OF
MECHANICAL
ERRORS
BUTTONM m BUTTON
DISPLAY OF
NO DISC
ERRORS
BUTTONM m BUTTON
M
M
M
M
4. To clear the error record, operate the cold reset. (Refer to the
“MC COLD RESET”.)
5. To release from this mode, press the ?/1 button or disconnect
the power OFF.
• Display of total error
Em** : The number of times for CDM (mechanical) errors.
Ed** : The number of times for BD error (after chucking the
disc.).
• Display of CDM (mechanical) error. It is show with “M” and
11 digit number.
Em**Ed**
M*$$%%&&0–
000
M* : The number of history error for mechanical. (“0” is
latest one) (Turn > button to display next error.)
$$ : Mechanical errors occur in the operation.
FF : Mechanical error during normal operation.
Other: Mechanical error during initializing operation.
D*$$%%&&#–
#00
D* : The number of error history (“0” is latest one)
(Press > button to display next error.)
$$ : The detail of trouble
01 : Can not focus
02 : GFS error
03 : Start-up time over
04 : Continuously out of focus
05 : Q code is not input for certain time
06 : Tracking on is impossible
07 : Blank disc
%% : The process when trouble occurs
01 : While SHIP process is performed
02 : While POWER OFF is processed
03 : While INITIALIZE (POWER ON) is processed.
04 : While oscillation stops
05 : From stopping oscillation to start oscillation
06 : During stop
07 : During STOP operation
08 : While start-up is processed
09 : While TOC reading is processed
0a : During search operation
0b : During PLAY operation
0c : During pause operation
0d : During PLAY manual search operation
0e : During PAUSE manual search operation
&& : Processing operation when trouble occurs
Show each STEP mentioned in %% digits.
## : Disc speed when trouble occurs.
01 : x1 speed
02 : x2 speed (for models which support x2 speed)
04 : x4 speed
00 : Not used (value is fixed to 00).

26
HCD-GTX88
[CD REPEAT 5 LIMIT OFF MODE]
• The number of repeat for CD playback is 5 times when the re-
peat mode is “REPEAT ALL”. This mode enables CD to repeat
playback for limitless times.
Procedure:
3. Press x button, [CD] button and [DISC 1] button simultaneously
to enter the CD repeat 5 limit off mode and the fluorescent
indicator tube displays “LIMIT OFF”.
• To release from this mode, operate the cold reset.
(Refer to the “MC COLD RESET”.)
[CD SHIP MODE (WITH MEMORY CLEAR)]
• This mode moves the optical pick-up to the position durable to
vibration and clears all data including preset data stored in the
RAM to initial conditions. Use this mode when returning the set
to the customer after repair.
Procedure:
3. Press x button, [SOUND FLASH] button and ?/1 button
simultaneously. The system will turn off automatically.
4. After the “STANDBY” blinking display finishes, a message
“MECHA LOCK” is displayed on the fluorescent indicator tube
and the CD ship mode is set.
5. The Memory is clear after AC Power OFF.
[CD SHIP MODE (WITHOUT MEMORY CLEAR)]
• This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.
Procedure:
3. Press [CD] button and ?/1 button button simultaneously. The
system will turn off automatically.
4. After the “STANDBY” blinking display finishes, a message
“MECHA LOCK” is displayed on the fluorescent indicator tube
and the CD ship mode is set.
[CD/USB POWER MANAGE]
• This mode let you switch on or off power supply to the BU and
USB Micom during TUNER function.
• When CD and USB POWER is set to OFF, the power supply to
the BU and USB Micom is cut off during TUNER function. It
will increase the time taken to access CD and USB when function
change from TUNER to CD or USB but it will improve tuner
reception.
• When CD and USB POWER is set to ON, the power supply to
the BU and USB Micom is not cut off during TUNER function.
It will reduce the time taken to access CD or USB when function
change from TUNER to CD or USB but it will decrease tuner
reception performance.
Procedure:
2. Select CD section.
3. Press ?/1 button to turn off the system.
4. When demonstration appear, press x button and ?/1 button
simultaneously. The set will power on automatically.
5. The message “CD/USB POWER ON” or “CD/USB POWER
OFF” will be displayed on the fluorescent indicator tube.
[CD TRAY LOCK MODE]
• This mode let you lock the disc tray.When this mode is activated,
the disc tray will not open when [OPEN/CLOSE] button or [DISC
SKIP/EX-CHANGE] button is pressed. The message “LOCKED”
will be displayed on the fluorescent indicator tube.
Procedure:
3. Press x button, [OPEN/CLOSE] button simultaneously and
hold down until “LOCKED” or “UNLOCKED” displayed on
the fluorescent indicator tube (around 5 seconds).
[TCM OFFLINE MODE]
• This mode is used to prevent the system from turning off auto-
matically when TCM is not connected. Therefore, measurements
can be done even when TCM is not connected during produc-
tion.
Procedure:
1. When the system is turned off, press [EQ BAND/MEMORY]
button, [TAPE A/B] button and ?/1 button simultaneously. The
system will turn on automatically.
2. The message “TCM OFFLINE” will be displayed on the
• To release from TCM Offline Mode, perform “COLD RESET”
or turn off the power supply.
[VACS DISPLAY]
• This mode is used to check the VACS level.
Procedure:
2. Press x button, [CHORUS] button and [DISC SKIP/EX-
CHANGE] button simultaneously.
3. TheVACS Level Display, the fluorescent indicator tube displays
“VATB F APC”. “V” represent VACS, A represent VACS level
which is triggered by signal level, “T” represent ThermalVACS
NEO, B representVACS level which is triggered by temperature,
“F” represent FAN is triggered by software to turn in to high
speed, “AP” represent APVACS (Abuse Protection VACS) and
“C” represent APVACS level which is triggered.

27
HCD-GTX88
[ERROR MESSAGE]
1. GC error message
• Display
Display on fluorescent indicator tube,
GC ERR01
When “GC ERR01” message appears, all LEDs lights up and
set becomes hang.
Set does not respond to any main unit keys or remote controller
keys.
• What to do
1. Please check the model resistor value and replace with correct
parts.
2. Plug in the set. The error message shall not be appear.
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
2.9m N • m to 6.9m N • m
FWD CQ-102C 30 to 70 g • cm
(0.42 – 0.97 oz • inch)
FWD
0.15m N • m to 0.59m N • m
back tension
CQ-102C 2 to 6 g • cm
(0.03 – 0.08 oz • inch)
2.9m N • m to 6.9m N • m
REV CQ-102RC 30 to 70 g • cm
(0.42 – 0.97 oz • inch)
0.15m N • m to 0.59m N • mREV
CQ-102RC 2 to 6 g • cmback tension
(0.03 – 0.08 oz • inch)
4.8m N • m to 16.7m N • m
FF/REW CQ-201B 49 to 170 g • cm
(0.68 – 2.36 oz • inch)
Mode Torque meter Meter reading
SECTION 4
MECHANICAL ADJUSTMENTS

28
HCD-GTX88
[FM Tune Level Check]
Procedure:
1. Turn the power on.
2. Input the following signal from Signal Generator to FM
antenna input directly.
* Carrier Freq: A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note: Please use 75 ohm “coaxial cable” to connect SG and the set. You
cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confirm “TUNED” is lit on the display forA, B and C signals.
The mark of “TUNED” means “The selected station signal is
received in good condition.”
FM signal generator
OUT (75 Ω)
SET
SECTION 5
ELECTRICAL ADJUSTMENTS
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit
adjustment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
[RECORD/PLAYBACK HEAD AZIMUTH
ADJUST-MENT]
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
set
MAIN board
CN510
Pin 1 (L-CH)
Pin 3 (R-CH)
MAIN board
CN510
Pin 2 (GND)
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
screw
position
L-CH
peak
within
1dB
output
level
L-CH
peak
R-CH
peak
within
1dB
screw
position
R-CH
peak
TUNER SECTION 0 dB = 1 µV DECK SECTION 0 dB = 0.775 V

29
HCD-GTX88
CD SECTION
[TEST DISC LIST]
Use the following test disc on test mode.
• CD: YEDS-18 (PART No. 3-702-101-01)
or
PATD-012 (PART No. 4-225-203-01)
Note:
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MW impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
[S-CURVE CHECK]
Procedure :
1. Connect an oscilloscope to TP106 (FE) and TP124 (VC).
3. Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
4. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 3 ± 0.5 Vp-p.
Note: • Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
MAIN
board
CN510
test tape
P-4-A100
(10 kHz, –10 dB)
pin 3
oscilloscope
L-CH
R-CH
V H
waveform of oscilloscope
in phase 45° 90° 135° 180°
good wrong
pin 2
pin 1
L
R
forward
reverse
+
–
TP106(FE)
TP124(VC)
oscilloscope
BD91 board
symmetry
S-curve waveform
within 3 ±0.5Vp-p
A
B

30
HCD-GTX88
[RF LEVEL CHECK]
Procedure :
1. Connect an oscilloscope to TP123 (RFO) and TP124 (VC).
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
Note: Clear RF signal waveform means that the shape “ ◊ ” can be
clearly distinguished at the center of the waveform.
Connecting Location: CD board
+
–
TP123(RFO)
TP124(VC)
oscilloscope
BD91 board
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
RF signal waveform
level: 1.3 ± 0.3 Vp-p
IC401
– BD91 Board (SIDE B) –
TP124
(VC)
TP123
(RFO)
TP106
(FE)
IC101
1
1
14
1528
25
26
50
5175
76
100

31 31
HCD-GTX88
HCD-GTX88
6-1. BLOCK DIAGRAM — RF/SERVO SECTION —
(Page 34)
SECTION 6
DIAGRAMS
DETECTOR
97
95
94
96
98
100
FNI1
FPI1
FNI2
FPI2
TPI
TNI
LD0
MDI
CD RF AMP,
FOCUS/TRACKING ERROR AMP,
DIGITAL SIGNAL PROCESSOR,
DIGITAL SERVO PROCESSOR,
DIGITAL FILTER,D/A CONVERTER
IC101
OPTICAL PICK-UP
BLOCK
(KSM-213DCP)
2AXIS
DEVICE
FOCUS/
TRACKING
COIL
91
92
26
27
24
AUTOMATIC
POWER
CONTROL
Q301
LASER
DIODE
FOCUS COIL
DRIVE
18
17
20
TRACKING COIL
DRIVE
12
9
13
10
FOCUS/TRACKING COIL DRIVER,
SPINDLE, SLED MOTOR DRIVER
IC401
2
1
SPINDLE MOTOR
DRIVEMM
M401
(SPINDLE)
MM
M402
(SLED)
FMO
FOO
DND
TRO
23 XI
24 XO
VREF
FOO
B
C
D
F
E
LD
PD
FCS+
FCS–
SL–
SL+
SP+
SP–
TRK+
TRK–
VC
VREF
VREF11
PREF77
VRO84
SLED MOTOR
DRIVE
23
7
XRST1 24
SBSY19
BIAS
MUTE
MMUTE2
4I/O11
TRO
FMO
FOO
DMO
TRO
FMO
DMO
30
27
CD+1.5V REG
IC201
DVDD+3.3VCD+1.5V
LO
RO
CD LCH
CD RCH
47AOUT2(PO5) DATA
63BCK(PO8) CLK
51PIO3 GATE
49PIO1 ST REQ
65AIN(PI4) AIN
66BCKI(PI5) BCKIN
67LRCKI(PI6)
SELECT112
1B3
1Y
4C
3C
2C
1C
4
2Y 7
1A2
2A5
2B6
3A11
6
5
13
4O/I
3I/O
3O/I
2I/O
2O/I
1I/O
1O/I
10
23
22
21
6
39
3
5
38BUS0
9
8
39BUS1
3
4
40BUS2 (SO)
1
2
11
10
9
8
3
4
1
2
41BUS3 (SI)
48PIO1
LRCKIN
BUS3
BUS2
BUS1
BUS0
3Y 9
4Y 12
REQ
CCE
3B10
4A14
4B13
BUCK
VM+7V
20 IO0(/HSO)
USB
SECTIONB
MAIN
SECTIONA
• Signal Path
11
12
9
3
93CCE
BUS0
BUS1
BUS2
BUS3
SEL SW
CDCLK
CDCCE
MP3IREQ
42BUCK
37RST
54SBSY
4I/O 124C
3C
2C
1C
6
5
13
4O/I
3I/O
3O/I
2I/O
2O/I
1I/O
1O/I
21
•
22
X102
16.934MHz
S201
(LIMIT)
DVDD+3.3V
SYSTEM CONTROL
IC401 (1/6)
SELECT SWITCH
IC567
SELECT SWITCH
IC566
SELECT SWITCH
IC568
SELECT
SWITCH
Q602
A
: CD PLAY
: DIGITAL
: USB
(Page 33)

3232
HCD-GTX88
HCD-GTX88
6-2. BLOCK DIAGRAM — TAPE/TUNER SECTION —
(Page 33)
(Page 33)
(Page 33)
ST-L E
MAIN
SECTION
REC-OUT-L
REC-OUT-L
D
MAIN
SECTION
TAPE
MECHANISM
BLOCK
32
A TRIGGER DRIVE
Q340,343
R-CH
TU901
FM/AM TUNER UNIT
ANTENNA
ST-L
FM ANT
AM ANT
AM ANT
ST-R
ST-DIN/MC-DOUT
ST-DOUT
ST-CLK
ST-CE
FM 75
COAXIAL
CAP M+
BTRGM+
ATRGM+
AHALF
BHALF
B SHUT
A SHUT
REC(FWD)
CAPM-CONT
B-TRIG
A-TRIG
TC-RELAY
A-HALF
B-HALF
B-SHUT
A-SHUT
REC BIAS
PB-A/B
ALC
REC-MUTE
TC-MUTE
AM
EQ OUT1A
B
ST-DIN/MC-OUT
SY-DOUT/MC-DIN
ST-CLK
ST-CE
34
28 27 26
2421
55
57
58
59
60
42 3
90
89
91
52
56
51
54
53
E-1 45
E-2 44
E-3 43
86
84
85
87
13 11 15 14
PB OUT1TAI1
REC IN1
AIN1
BIN1
A/B
ALCON/OFF
RECMUTEON/OFF
MUTEON/OFF
DECK A/B SELECT,
PB/REC EQUALIZER AMP
IC301
SYSTEM CONTROL
(TAPE MECHANISM CONTROL)
IC401 (2/6)
REC-OUT1
EQ
TC-PB-L
TEST
CONNECTOR
CN510
R-CH R
L
C
MAIN
SECTION
PB
HEAD
DECK-A
DECK-B
BIAS OSC
Q370
BIAS
TRAP
MUTE CONTROL
SWITCH
Q377, 379
TC PB MUTE
CONTROL SWITCH
Q382.383
R-CH
R-CH
Q376
Q373,374
Q381
L – CH
R – CH
R-CH
BIAS+9V
REC/PB
HEAD
ERASE
HEAD Q378,380
T301
L – CH
R – CH
• R-CH is omitted due to same as L-CH.
A TRIGGER DRIVE
Q342,345
CAPSTAN MOTOR DRIVE
Q341,344
4
1
2
TABLE ADDRESS SENSOR
IC731
LD MOTOR DRIVER
IC701
TBL MOTOR DRIVER
IC712
M+9V
Q731
MOTOR
DRIVE
M751
(TABLE LOADING)
M
RE701
ROTARY ENCODER
DISC TRAY
ADDRESS DETECT
S751
OPEN/CLOSE
DETECT
LM-F
TBL SENS
FIN
RIN
48
OPENSW 41
LM-R 49
7
9
OUT2
OUT1
2
4
MOTOR
DRIVE
M741
(TABLE)
M
TM-F FIN
RIN
46
TM-R 47
7
9
OUT2
OUT1
2
4
: TAPE PLAY (DECK B)
: TAPE PLAY (DECK A)
: TUNER
: RECORD (DECK B)
• Signal Path
: AUDIO

33 33
HCD-GTX88
HCD-GTX88
6-3. BLOCK DIAGRAM — MAIN SECTION —
(Page 31)
(Page 35)
(Page 32)
(Page 35)
(Page 32)
(Page 36)
(Page 32)
(Page 35)J101
RCH
L
CD LCH
CD RCH
R
AUDIO
IN
CD RCH
11
10
9
3
RCH
MIXER
IC1500
MULTIPLEXER
IC1503
DIGITAL DELAY
IC1501
SIGNAL SELECTER
IC564
SURROUND VOLUME CONTROL
IC201
INPUT SELECT SWITCH,
GRAPHIC EQUALIZER CONTROL,
ELECTRICAL VOLUME
IC101
SIGNAL SELECTER
IC563
MIC AMP
IC1100
(1/2)
MIC AMP
IC1100
(2/2)
RV1150
MIC
LEVEL
LPF1IN
A
B
C
COM
CD
A-MUTE
SOURCE
SEL 2
SOURCE
SEL 1
CTRL
1
CTRL
3
DATA CLK Z
GROOVE
FREQ
LINE
MUTE
EFFECTOR
SYSTEM CONTROL
IC401 (3/6)
S0
S1
S2
SEL
9LPF2OUT
19SAOUT
A+9V
L+R
SPEANA
J1100 (2/2)
10LPF2IN
11OP2OUT
12OP2IN
LPF1OUT
CLOCK14
3
2
25 26 2771865 28 78 77 81 82 75 80 79 66
RCH
L
R
VIDEO
IN
MIXER
IC1505
BUFFER
Q1513
MUTE
Q250
CD MUTE
Q540
DBFB
SWITCH
Q101SELECT
SWITCH
Q596
SELECT
SWITCH
Q597
BUFFER
Q1509
EFFECTOR
SELECT
SWITCH
Q598
XRF/SERVO
SECTION
A
ST L
TC PB L
XTAPE/TUNER
SECTION
TAPE/TUNER
SECTION
E
X DISPLAY/POWER
SECTION
G
X AMP/SUBWOOFER
SECTION
I
REC OUT L X TAPE/TUNER
SECTION
D
X AMP/SUBWOOFER
SECTION
F
X AMP/SUBWOOFER
SECTION
H
XC
4 IMB1
DBFB F/B
SWITCH
Q608
SWITCH
Q591
3 INA1
6 IND1
14 LFE VOL IN
2 MIC
8RECB1
F–L18OUT1
24SWOUT
16BB A1
17BB B1
11TCA1
21DATA
22CLOCK
12TCB1
SW OUT34FL OUT
17DATA
18CLOCK
MUTE
Q180
D+4V REG
Q325
MUTE
Q607
LINE MUTE
Q544
1
5
3
10
Y0
Y1
Y
A
D101,102
J103
EXCEPT AUS MODEL
D-LIGHT
SYNC OUT
3
2
9
10
Y1
Y2
Y3
A
B
Y
5
4
J1100
(1/2)
MIC
Q1500
Q1508
Q1506
Q1502
RCH
M61529
DATACLK
M61530
7
13
5
3
: AUDIO
: CD PLAY
: TAPE PLAY (DECK A)
: TAPE PLAY (DECK B)
: MIC
: TUNER
• Signal Path
• Abbreviation

3434
HCD-GTX88
HCD-GTX88
6-4. BLOCK DIAGRAM — USB SECTION —
(Page 31)
77
78
3
45
VBUS+5V
USB CONTROL
IC901
VBUS
POWER ON/OFF
SWITCH
IC915
SYSTEM CONTROL
IC401 (4/6)
S-RAM
IC921
CN952
1
4
(USB)
VBUS
D–
D+
GND
OUT
P75/USBOC
P76/USBPON
D–
OE
A0
I
A2
A3
I
A6
A7
I
A10
A11
I
A15
WE
LB
UB
CE
D+
IN
FLG
EN 1
80
79
PF1/RXDODATA 85
PF2/SCLK0/CTSO/CLK/TB0OUT0CLK 86
PN5/HSS1/SCL1GATE 94
PN4/HSS0/SDA1A IN 93
PN3/HSCLKBCK IN 92
P83/CS3/WAIT/TA5OUTLRCKIN 71
P64/A20
P63/A19
P62/A18
P61/A17
USBRST
USB SERIAL TXDO
USB SERIAL RXDO
USB SERIAL RTSO
USB SERIAL CTSO
BUS3 58
BUS2 57
BUS1 56
BUS0 55
P66/A22CCE 60
P65/A21BUCK 59
PG3REQ 96
PG2ST REQ 97
P70/RD
P71/SRWR
18
I
25
•
28
I
35
64 41
1765
P72/SRLLB
P73/SRLUB
66 39
4067
P82/CS2 70 16
RESET
PC0/INT0
1 31
382
PF0/TXD0
PF4/RXD1/SPDI
84 34
3588
PF3/TXD1/SPD0 87
X1 75
X2 73
36
P00/D0
I
P07/D7
P10/D8
I
P17/D15
37
I
43
•
46
I
54
44
I
42
•
27
I
24
•
21
I
18
•
5
I
1
I/O0
I
I/O3
I/O4
I
I/O7
I/O8
I
I/O11
I/O12
I
I/O15
7
I
10
•
13
I
16
•
29
I
32
•
35
I
38
P41/A1
I
P47/A7
P50/A8
I
P60/A16
RF/SERVO
SECTION
B
X901
9kHz
• Signal Path
: USB
: DIGITAL

35 35
HCD-GTX88
HCD-GTX88
6-5. BLOCK DIAGRAM — AMP/SUBWOOFER SECTION —
(Page 33)
(Page 33)
(Page 36)
(Page 36)
(Page 33)
MUTING
Q604, 606, 610
F-R
DBFB F/B
F-L
67
STKMUTE
12
OVER LOAD
DETECT
Q668, 618
+ + +
MUTE
Q640, 641
MUTE
CONTROL
Q634,682,684
71
LINKRELAY
88
FANHISPEED
97
SWVOLLED
100
HPDET
95
SWVOLIN
RELAY DRIVE
Q644, 647
+VL
–VL
IN1
ST BY
+RE1
–RE1
+RE2
–RE2
+VCC
–VCC
SW OUT
+
-
-
+
FRONT SPEAKER
SUB WOOFER
OUT
L
R
PHONES
J1101
RY646
RY862
+
-
-
+
L
R
FAN MOTOR
DRIVE
Q579, 585 DC FAN
M891
M
M
FAN MOTOR
DRIVE
Q586–588
FAN CONTROL
SWITCH
Q584
FAN DETECT
Q580–582
DC FAN
M892
TH629
THERMAL
DETECT
Q628, 630
94
THERMALVACS
TB001
TM600
D624
D550
18 11
10
9
14 8
• SIGNAL PATH
POWER AMP
IC601
69
PROTECTOR
70
FRONTRELAY
68
HPMUTE
H
MAIN
SECTION
FMAIN
SECTION
MAIN
SECTION I
DISPLAY
/POWER
SECTION
K
DISPLAY/
POWER
SECTION
J
TH630
11
4
5
6
7
3
2
13
OCP CT
OUT
VL(AC)
1
VP2
4
3
STK MUTE
Q812
SUBWOOFER POWER AMP
IC800
SYSTEM CONTROL
IC401 (5/6)
OVER CURRENT
PROTECTOR
IC550
OVERLOAD
DETECT
Q850
AC OUT
DETECT
Q815
UNDER VOLTAGE
DETECT SWITCH
Q506
RELAY
DRIVE
Q814
OVERLOAD
DETECT
Q800
OVERLOAD
DETECT
SWITCH
Q648
RY665
FAN CONTROL
HI SPEED
SWITCH
Q581
SYSTEM
CONTROL
+9V
CN102
+
-
-
+
SURROUND SPEAKER
L
R
TM601
RELAY DRIVE
Q666
72
SWSPKRELAY
61
UNDERVOLTAGEDET
: AUDIO

3636
HCD-GTX88
HCD-GTX88
6-6. BLOCK DIAGRAM — DISPLAY/POWER SECTION —
USB +5V
ND900
VACUUM
FLUORESCENT
DISPLAY
9,10,12–22,
24–41,43–47
1–6,87-100
P1–36G2–21
64–66
7,8,86
BF4
1
SPECTRUM
ANALYZER
IC902
67
6816
2
15 69
71
48
80
ALL BAND
BF3
BF1
IN2
IN1
VKK
LED SELECTOR
G1,22,23
G1,22,23
G2-21
13
17
73 VOLUMEMASTER
VOLUME
SPEANA
P1 – 36
VF1
VF2
D900
–VG
(–32V)
FUN CONTROL
X900
4MHz
83 XI
82 XO
52–59,
75,76,78,79
LED DRIVE
Q906–911, 913–916
920,921
D906, 908, 910, 913, 917,
921, 929, 923, 925, 927
D905, 907, 909, 912, 914,
916, 922, 924, 926.955
LED+9V
Q903
Q902
Q901
Q900
D904
(R)
D930
(G)
KEY2
|
KEY0
S901 – 914,
916 –933
60I2C DATA
61I2C CLK
77RESET
30 IIC-DATA
29 IIC-CLK
IIC-DATA
IIC-CLK
37 GC-RESET
74 POWER-KEY
73 DISPLAY-KEY
S934
S900
DISPLAY
33 STBY-LED/FAN CONTROL
4 SIRCS RESET
X402
5MHz
15 X-IN
13 X-OUT
X401
32.768kHz
10 XC-IN
11 XC-OUT
SYSTEM CONTROL
IC401 (6/6)
50STBY-RELAY
12RESET
20AC-CUT
D671
D402
D501,504
POWER
SWITCHING
LED DRIVE
Q904,905
RECT
D658
RECT
D656
+VL
VL(AC)
F1261 VL
VL
VH
VH
VP
VF
VF
GNDF1271
F1241
F1251
R1292
–VL
+VH
–VH
– 33V
REGULATOR
Q1264
POWER ON/OFF
RELAY DRIVE
Q1200
– VG
(-32V) D1292
RECT
VF1
VF2
ND900
VACUUM
FRUORESCENT
DISPLAY
RY1200
AC IN
T1200
POWER
TRANSFORMER
RESET
SWITCH
Q501
REMOTE CONTROL
SIGNAL RECEIVER
IC901
EVER +4V
D+3.3V
DISPLAY CONTROL,
KEY CONTROL
IC900
BUFFER
Q917, 918, 919
70 BF214
72 OPERATION DIALROTARY
ENCODER
ROTARY
ENCODER
OPERATION
DIAL
NO402
(FOR CHECK)
CN402
(3/3)
(FOR CHECK)
40USB-POWER
63OVER VOLTAGE DET
32CD POWER
USB POWER
CONTROL
SWITCH
Q590,603
RECT
D540
M +9V
VM +7V
LED +9V
A +9V
ST +9V
OVER VOLTAGE
DETECT SWITCH
Q550
AC3
AC3F1281
AUDIO +9V
BIAS +9V
UNREG
S1200
S1200
230 – 240V
|
220V
|
120V
VOLTAGE
SELECTOR
AUS,AR MODEL
E2,E51 MODEL
S936
S935
XMAIN
SECTION
G
XAMP/SUBWOOFER
SECTION K
XAMP/SUBWOOFER
SECTION
J
LEVEL
DETECT
IC402
USB+5V REG
IC565
+9V REG
IC560
+9V REG
IC561
DVDD+3.3V
REG
IC562
D592
D561,
562
D590,594
E2,E51
MODEL
D593
DVSS +3.3V
D +3.3V
AVDD +3.3V
DVDD +3.3V
USB POWER
CONTROL
SWITCH
Q604–606
CD POWER
CONTROL
SWITCH
Q560,561
USB+9V REG
IC570
D+4V REG
IC569
• Abbreviation
(Page 33)
(Page 35)
(Page 35)

37
HCD-GTX88
6-7. CIRCUIT BOARDS LOCATION
MOTOR (LD) board
SENSOR board
SW board
MOTOR (TB) board
DRIVER board
MAIN board
MIC board
JOG board
FUNCTION board
PANEL board
BD91 board
USB board
USB CONNECTOR board
POWER board
TRANS board
PRIMARY board
CD-SW board
TUNER PACK
EFFECTOR board
SWITCHING POWER
SUBWOOFER board

38
HCD-GTX88
• Note For Printed Wiring Boards And Schematic Diagrams
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• : Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
• Indication of transistor.
• A : B+ Line.
• B : B– Line.
• Voltage and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• BD91 and Driver sections.
no mark : CD PLAY
• Except BD91 and Driver sections.
no mark : FM
( ) : CD PLAY
< > : TAPE PLAY
[ ] : TAPE REC
∗ : Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F : AUDIO
f : TUNER
E : TAPE PLAY (DECK A)
d : TAPE PLAY (DECK B)
G : TAPE REC (DECK B)
N : MIC
J : CD PLAY
c : DIGITAL
I : USB
• Abbreviation
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to about
350 °C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may also
be added to ordinary solder.
C
B
These are omitted.
E
Q
B
These are omitted.
C E
Q
B
These are omitted.
C E
Q
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1
/4 W or less unless otherwise
specified.
• 2 : nonflammable resistor.
• C : panel designation.

39 39
HCD-GTX88
HCD-GTX88
• Waveforms
— BD91 BOARD — (CD PLAY)
— USB BOARD —
— MAIN BOARD —
— PANEL BOARD —
1.4 Vp-p
9 MHz
1 IC901 ug
1 V/DIV, 0.1 µsec/DIV
(X1)
3.1 Vp-p
1V/DIV, 0.2 µsec/DIV
4MHz
1 IC900 is XO
1 Vp-p
32.768 kHz
1 IC401 q; (XC-IN)
0.5 V/DIV, 0.1 µsec/DIV
1.5 Vp-p
5 MHz
2 IC401 qg (X IN)
1 IC101 5 (FEI)
2 IC101 6 (TEI)
100 mV/DIV, 0.2 msec/DIV
50 mV/DIV, 0.1 µsec/DIV
3 IC101 wf (XO)
100 mV/DIV, 5 msec/DIV
2.4 Vp-p
4 IC101 og(FNI1(A))
Approx.
150 mVp-p
16.934 MHz
Approx.
200 mVp-p
Approx.
200 mVp-p

4040
HCD-GTX88
HCD-GTX88
6-8. PRINTED WIRING BOARD — BD91 SECTION — • Refer to page 37 for Circuit Boards Location. : Uses unleaded solder.
(Page 48)
1
A
B
C
D
E
F
G
H
I
2 3 4 5 6 7 8 9 10 11 12 13 14
MAIN
BOARD
CN5051
A
R216
R214
R213
R155
C128
C106
C201
R304
R302
C309
C205
C207
C307
X102
R201
R303
C133
R111
R112
C115
R211
Q301
R301
C204
C202
C206
C306
R212
C401
C405
C130
IC201
X102
R119
R121
R114
C153
R118
R415
C112
C108
M401
(SPINDLE)
M402
(SLED)
C428
R150
R149
R148
R154
R153
C148
C110
C109
C301
C303
C302
C104
R110
C116
C404
R203
R204
R205
R206
R207
R208
R209
R210
R219
R223
R222
R147 R221
R218
R146 R145
C150
C403
R202
C151
C105
C147
C146
C145
C152
C118
C117
C144
C101
C125
TP124
(VC)
TP123 (RFO)
TP106
(FE)
C143
C120
R144
R157
C142
C141C140
C100
C107
R408
R156
C124
IC401
C127
C126
CN301
OPTICAL PICK-UP BLOCK
R101
C119
C102
IC101
C103
R405
C113
R102
R402
R105
R106
C132
C138
C137
R135
R134
R136
R128
R129
R143
R142
R139
C136
C149
C139
R140
R151
C122
C123
R220
R104
R224
R109 R108
CN202
R414
S201
(LIMIT)
M
M
1-872-620- (12)
12
1-872-620- (12)
12
1
3 4
5

41 41
HCD-GTX88
HCD-GTX88
(Page 45)
• Refer to page 39 for Waveforms.
• Refer to page 64 IC Block Diagrams.
6-9. SCHEMATIC DIAGRAM — BD91 SECTION — • Refer to page 70 for IC Pin Description of IC101.
IC B/D
IC B/D
Q301
R304
R303
IC201
C202
R140
R144
R110
R101
R157
R156
R114
C201 R201
R202
R211
R203
R204
R205
R206
R207
R208
R209
R210
R212
R213
R214
R216
TP205
TP211
TP212
TP213
TP214
TP215
TP216
TP217
TP218
TP219
TP208
TP209
TP204
TP203
TP202
TP201
TP221
TP222
TP108
TP109
TP110
TP111
TP112
TP113
TP226
TP225
TP224
TP210
TP220
TP206
TP207
TP119
TP117
TP118
TP121
TP116
TP115
TP114
R301
R111
TP104
TP223
TP103
TP101
TP102
R151
TP315
R223
R222
R221
R220
R219
R218
TP124
R145
R146
R147
R148
R149
R150
TP125
TP228
TP227R224
R109
R143
R139
C106
C401R415
R129
R142
R153
R154
R155
CN202
TP305
TP304
TP301
TP302
TP303
TP306
TP307
TP313
TP308
TP310
TP311
TP309
C307
C309
C301
C100
C140
C141
C142
C105
C143 C144
C146
C145C148
C147
C149
C104
C150
C118
C117
C120
C119
C102
C127
C126
C103
C113
C101
C132
C128 C130
C110
C133
C153
C151
C152
C205
C204
C403C404
C405
C115
C116
R112
C206
C109
C207
R121
TP120
TP122
TP123
C139
TP312
C302
C303
TP314
C306
R302
C137 C138
R118 C108
R119
C112
R134
R135R136
C136
R130
R128
C107
IC101
R104
R105 R106
R102
TP107
TP106
TP105
C122
C123
C125
C124
R405
R402
R408R414
TP407
TP408
TP409
TP410
X102
S201
M401
M402
CN301
IC401
R108

4242
HCD-GTX88
HCD-GTX88
6-10. PRINTED WIRING BOARDS — DRIVER SECTION — • Refer to page 37 for Circuit Boards Location. : Uses unleaded solder.
1
A
B
C
D
E
F
G
H
2 3 4 5 6 7 8 9 10 11 12 13 14
(OPEN/CLOSE DETECT)
(DISC TRAY ADDRESS DETECT)
1
9
1
9
1
4
1
2
1 2
CN751
S751
IC731
CN731
CN741
CN742
CN721
MAIN
BOARD
CN511
B
C715
C731
C735
C736
R701
R711
R731
R721
R722
R723
R736
R732
R733
R734
D701
D711
C751
IC712IC701
CN704
C737
R713
R712
C741
R702
JW702
JW703
JW704
JW705
JW706
JW707
JW708
JW711
CN703
CN702 CN705
R751
C752
JW712
JW701
JW709
JW710
JW713
JW714
CN701
Q731
B E
(Page 48)

43 43
HCD-GTX88
HCD-GTX88
6-11. SCHEMATIC DIAGRAM — DRIVER SECTION — • Refer to page 64 for IC Block Diagrams.
(Page 44)
IC B/D
IC B/D
MAIN
BOARD
(1/4)
CN511
B
390
R751
C752CN705
CN704CN721
CN751
C751
IC701
IC712
R701
R713
R711
R723 R721R722
C735C736C737
R736
R733
R731
C731
Q731
C741
CN703
IC731
CN731 CN741
CN742
C715
R702
R712
R732R734
D711
M751
M741
S751
CN701
D701
CN702
CN711
RE701

4444
HCD-GTX88
HCD-GTX88
6-12. SCHEMATIC DIAGRAM — MAIN SECTION (1/4) — • Refer to page 72 for IC Pin Description of IC401.
(Page 57)
(Page 63)
(Page 46) (Page 47)
(Page 45)
(Page 45)
(Page 43)
1312
B
754 11
E
10
I
H
D
9
G
6
A
14
F
2
J
C
31 8
IC B/D
3.2
0
3.7
3.7
4 15 1515
6.2
3.2
0.1
15 3.3
1.9
1.3
1.3
3.2
2.5
3.2
0.2
-0.2
3.1
3.4
3.3
3.2
3.2
3.2
3.3
3.2
3.3
3.3
3.2
3.2
3.4
3.4
3.4
0
0
0(3.2)
0(3.2)
0
0
3.2
0.1
3.3
3.4
3.3
3.1
3.1
2.8
0.8
3.4[0]
3.4[ ]
3.4< >
2.9
3.2
0.1
0
0
0
0
0
3.4<0>
0<3.2>
0
0[3.2]
0[3.2]
3.3
3.3
0[3.3]
3.3<0>
0.1
3.3
3.4
0(3.3)
3.3
3.2
2.7
3.4
3.2
3.2
3.2
3.4
3.4
3.2
3.2
3.2
0
0
9.1
9.1
9.1
0
0
0 9.1
9.1
9.1
0
9.1
0<3.2>
[3.2]
0.9<9.1>
[9.1]
9.1<0.1>[0.1]
9.1<8.3>[8.3]
0(3.2)
3.2
3.2(-6.8)
3.3
3.2
-6.6
0.1
1.3
3.4
0<3.4>[3.4]
3.2
0
0
0
0
0
0
0
3.7
0
3.2
3.3
3.3
1.5
1.8
3.2
1.3
0.6
0
3.2(0)
0
3.3
3.3
3.3
0(3.3)
3.3
2
(AUS)
(EXCEPT AUS)
3
(E2,E51)
(AUS)
2 2
(AR)
E2,E51
MODEL
AUS,AR
MODEL
(EXCEPT E2)
(E2)
1
1
1
E2
MODEL
MAIN BOARD
1
2
3
4
5
6
7
8
9
10
11
12
13
13P
CN511
OPEN SW
D+3.3V
TBL ADD SW
E-3
E-2
E-1
TM-F
TM-R
LMF
LMR
MGND
MGND
M+9V
123456789101112131415161718192021222324252627282930
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
IC401
M30622MGP-A57FPU0
XRST
MMUTE
CDCCE
SIRCS
CDCLK
MP3IREQ
SOURCESEL1
BYTE
CNVss
XC-IN
XC-OUT
RESET
X-OUT
VSS
X-IN
VCC
NMI
SOURCESEL2
SBSY
AC-CUT
BUS3
BUS2
BUS1
BUS0
EFFECTOR-S0
EFFECTOR-S1
EFFECTOR-S2
EFFECTORSEL
IIC-CLK
IIC-DATA
USBRST
CD-POWER
STBY LED/ FAN CONTROL
USB SERIAL CTS0
USB SERIAL TxD0
USB SERIAL RxD0
GC RESET
USB SERIAL RTS0
SEL_SW
USB PWR
OPEN-SW
TBL-SENSE
E-3
E-2
E-1
TMF
TMR
LMF
LMR
STBY RELAY
ATRIG
A-HALF
CAPM+
BTRIG
RECBIAS
TC-RELAY
PB-AB
ALC
RECMUTE
TCMUTE
UNDERVOLTAGEDET
VCC
OVERVOLTAGEDET
VSS
CDUSBMUTE
LINEMUTE
STKMUTE
HPMUTE
PORTECTOR
FRONTRELAY
LINKRELAY
SW-SPK-RELAY
DISPLAY-KEY
POWER-KEY
ZGROOVEFREQ
NOUSE
CTRL3
CTRL1M61530-DATA
M61530-CLK
M61529-DATA
M61529-CLK
NO USE
ST-CE
ST-DIN/MC-DOUT
ST-CLK
ST-DOUT/MC-DIN
FAN HI SPEED
A SHUT
B SHUT
B-HALF
MODEL-IN
DEST-IN
THERMAL VACS
SW VOL IN
AVSS
SW-VOL-LED
VREF
AVCC
HP DET
1
2
3
4
5
6
7
8
9
10
11
11P
CN509
ATRGM+
A SHUT
AHALF
CAPM+
REC(FWD)
TCM MGND
TC DGND
B SHUT
BHALF
NC
BTRGM+
10kR273
22kR272
4.7kR294
3.3kR297
4.7kR296
47kR293
3.3kR295
2SB1132-T100-QR
Q340
2SB1132-T100-QR
Q341
2SB1132-T100-QR
Q342
2.2k
R343
2.2k
R347
2.2k
R340
2.2k
R342
3.3k
R345
3.3k
R349
3.3k
R341
4700p
C341
4700p
C340
1k
R502
0
R503
220
R501
50V
22
C501
0.1
C503 TP502
100
R430
100R429
100R428
100R421
100R422
100R423
100R424
100R425
100R426
100R427
100R419
100R400
100R401
100R402
100R403
100R404
100R405
100R406
100R40710k
R409
330k
R411
0R413
10kR417
220R418
100kR412
1kR420
32.768kHzX401
22pC411
22pC410
6.3V2200C416
0.1
C412
0.1C417
100R432
100R433
100R436
100R438
100R439
100R440
100
R441
100R442
100R443
100R444
100R445
100R446
100R448
100R449
100R435
100R478
100R477
100R47510k
R574
10k
R573
100R468
100R469
100R470
100R472
100R473
100R474
10V
100
C462
0.1
C464
10kR463
10kR500
0.1C499
0.1
C497
50V
10
C498
4.7k
R592
R593
1.5kR492
R493
100R490
100R489
100R488
100R486
100R485
100R484
1kR497
RT1P137P-TP-1
Q560
2.7k
R560
2.7k
R562
2.7k
R563
R561
1k
0.1
C567
6.3V1000
C568
I O
G
TA78033LS
IC562
0.1
C539
R581
15k
R531
1k
1
2
3
4
4P
CN100
MIC GND
MIC SIG
A+9V
HP DET
0.1
C149
1
2
3
4
5
6
7
8
9
10
10P
CN402
D-GND
TXD1
RTS1
NC
MCU VCC
CLK1
RXD1
CN VSS
RESET
GND
1
2
3
4
4P
NO402
D-GND
D+3.3V
11C-CLK
11C-DATA
10k
R508
10k
R509
1
2
3
3P
NO401
STBY RLY
D-GND
EVER+4V0.1
C405
0.1
C502
JR131
TP501
6.3V470
C584
1
2
3
4
5
6
7
8
9
9P
CN506
ST-L
ST+9V
ST-R
GND
TUNED
ST-CE
ST-DIN
ST-CLK
ST-DOUT
150k
R548
150k
R542
2.2k
R547
22k
R546
22k
R540
MC2836
D402
MC2836
D585
100R491
10kR586
10k
R537
100R447
100R471
100R467
R495
1k
100R431
100R434
MA111-TX
D340
MA111-TX
D342
MA111-TX
D504
MA111-TX
D501
MA111-TX
D502
IO
G
TA7804LS
IC569
0.1
C614
MA111-TX
D503
MA111-TX
D593
10EDB40-TB3
D592
10EDB40-TB3
D594
10EDB40-TB3
D590
10k
R663
1k
R660
22k
R661
10k
R662
C608
0.1
JW570
JW561
JW568
10k
R541
10k
R672
2.2k
R673
10k
R344
10k
R348
10k
R346
2SB1690TL
Q604
100R487
R582
R532
10kR587
50V4.7
C545
50V4.7
C544
5.6k
R510
50V10
C511
RT1N430C-TP-1
Q506
RT1P241C-TP-1
Q544
RT1P241C-TP-1
Q540
RT1N141C-TP-1
Q344
RT1N141C-TP-1
Q345
RT1N141C-TP-1
Q343
RT1N141C-TP-1
Q606
RT1N141C-TP-1
Q561
Q605
2SC2712-YG-TE85L
RT1N241C-TP-1
Q501
RESET SWITCH
RT1P241C-TP-1
Q583
STANDBY LED/FAN CONTROL
SWITCH
1M
R595
50V4.7
C540
50V4.7
C541
4.7k
R529
4.7k
R530
A1
A2
A5
A6
A7
A8
A9
A10
A11
A12
A14
A15
A16
A3
A4
A13
B2
B1
A17
E2
E3
E4
E5
E6
E7
E8
E9
E10
E1
5MHz
X402
5 4
321
BD4929G-TR
IC402
54
51
41
42
43
44
45
46
68
66
58
57
56
55
54
53
65
82
12
9
32
33
34
31
73
74
80
79
81
66
65
47
49
48
47
46
45
44
43
42
41
48
49
91
90
89
59
52
51
70
71
72
67
69
38
35
28
27
26
25
39
24
23
22
21
5
3
2
1
4
7
18
95
87
86
85
84
85
86
87
77
78
75
37
32 32
53
34
34
36
19
6
60
88
31
31
40
40
3301
30
29
29
33
33
94
97
9
84
40
32
12
89
90
91
52
29
30
DVDD+3.3V REG
IC562
D+4V REG
IC569
LEVEL DETECT
IC402
SYSTEM CONTROL
IC401
(1/4)
2 1
TAPE
MECHANISM
DECK
FM/AM
TUNER
PACK
B
DRIVER
BOARD
CN701
TEST
PIN
PIN
TEST
Q341,344
CAPSTAN MOTOR DRIVE
Q342,345
B TRIGGER DRIVE
Q340,343
A TRIGGER DRIVE
CD MUTE
Q540
LINE MUTE
Q544
UNDER VOLTAGE DETECT SWITCH
Q506
CD POWER CONTROL SWITCH
Q560,561
USB POWER CONTROL SWITCH
Q604-606
ANTENNA
FM 75Ω
COAXIAL
AM
TU901
BOARD
MAIN
(2/4)
1
BOARD
MIC
CN902G
BOARD
PRIMARY
CN1200
J
BOARD
MAIN
(2/4)
2
MAIN BOARD (4/4)
4
MAIN BOARD (3/4)
3
R493
1.5k
4.7k
R593
1k
4.7k
680
0
R532,582
680
3
2
11
2
3

45 45
HCD-GTX88
HCD-GTX88
6-13. SCHEMATIC DIAGRAM — MAIN SECTION (2/4) — • Refer to page 64 for IC Block Diagrams.
(Page 51)
(Page 46) (Page 47)
(Page 41) (Page 53)
(Page 44)
(Page 44)
12
K
3 4
A
6
D
9
J
F
E
2
C
51
G
I
138
B
157 141110
H
16
1BOARD
(1/4)
MAIN
2BOARD
(1/4)
MAIN
USB BOARD
D
CN907
BD91 BOARD
A
CN202
EFFECTOR BOARD
E
CN1502
5
MAIN BOARD (3/4)
6
MAIN BOARD (4/4)
IC B/D IC B/D IC B/D
IC B/D
IC B/D
IC B/D
IC B/D
3.2 3.2 3.2 0 0 0 0
0 0 0 0 3.2 3.2 0 0.1 0 0.1 0 0
3.2 0 0 0 0 0 0.1 3.2 0.1 3.3 3.2 0.1 3.3 3.2
3.2 0 0 0 0 0 0
0 0
0.60.6
3.2
3.2
(0)
00(9)
9 4.5 4.5 4.5 4.5 4.5 0(9) 0
4.5 4.5 4.5 4.5 4.5
9 4.4 4.5 4.4 4.5 4.4 0
4.5 4.4 4.5 4.5 4.5
0
3.2
4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 0
4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.2 9 0
4.5
0
0
4.54.5
4.1
0
4.5
0
4.1
3.2
04.5
4.5
4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6
4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.6 9 0 0 4.6
3.2
0
100k
RT1N141C-TP-1
G
L1
R1
L2
R2
J101
220p
C263
220p
C260
220p
C261
220p
C262
0
R261
0
R262
42 41 37383940
1 2 3 4 5
343536
6 7 8 9
30313233
10 11 12 13
29 28 27
14 15 16
26 25
17 18
24 23 22
19 20 21
M61530FP-D60G
IC201
FRLPFOUT
FRLPFIN
SLEXTIN
SLVOLIN
SLLPFOUT
SLLFPIN
SREXTIN
SRVOLIN
SRLPFOUT
SRLPFIN
CVOLIN
CLFPOUT
CLPFIN
LFEVOLIN
SWIN
VCC
DATA
CLOCK
GND
TEST
AGC
SWLPFOUT
SWLPFIN
SWOUT
COUT
SROUT
SRBB2
SRBB1
SLOUT
SLBB2
SLBB1
FROUT
FRIN
FLOUT
REFOUT
REFIN
LLPFIN
LLPFOUT
RLPFOUT
RLPFIN
FLLPFIN
FLLPFOUT
R229
6.8k
6.8k
R228
0.1
C231
0.1C220
10V100C222
10V
100
C223
0.1C221
12k
R221
100k
R220
C230
0.1
50V1
C207
220pC206
0.1C205
220pC203
1kR204
1kR205
10V220C204
0
R203
50V
10
C202
10V
1000
C535
0.1
C520
42 41 37383940
1 2 3 4 5
343536
6 7 8 9
30313233
10 11 12 13
29 28 27
14 15 16
26 25
17 18
24 23 22
19 20 21
M61529FP-D60G
IC101
REF
MIC
INA1
INB1
INC1
IND1
RECA1/Nex1
RECB1
TMI1
TMO1
TCA1
TCB1
TCC1
TOUT1
VILIN1
BB_A1
BB_B1
OUT1
SAOUT
VCC
DATACLOCK
GND
SWOUT
OUT2
BB_B2
BB_A2
VOLIN2
TOUT2
TCC2
TCB2
TCA2
TMO2
TMI2
RECB2
RECA2/INex2
IND2
INC2
INB2
IINA2
SUR2/DPL2
SUR1/DPL1
10k
R122
10k
R156
10k
R155
50V
10
C161
C160
0.015
10kR152
50V
1
C159
0.022C157
0.022C1562.2k
R151
0.068
C140
50V10C153
50V
10
C154
50V10C155
10k
R140
1k
R154
100R166
220R157
R257
1.8k
R250
1.8k
2SD2114KT146
Q251
2SD2114KT146
Q250
10V
100
C100
50V
10
C150
50V
10
C103
50V
10
C104
50V10
C105
100
R116
220
R107
2.2kR101
100
R150
0.1
C115
50V10
C111
0.22C112
0.27C113
C110
0.015
10k
R121
100
R119
10k
R106
560
R103
47k
R105
50V1
C109
0
FB150
0.022C106
0.022C10710kR102
50V10C130
2.2k
R130
2.2k
R131
100k
R133
50V
0.47
C131
0.1
C536
TP213 TP212 TP211 TP210 TP209 TP208 TP207 TP206
TP205TP204TP203TP202TP201
10EDB40-TB3
D561
10EDB40-TB3
D562
50V
C281
10
50V
C280
10
JR129
0
0.1
C240
0.1C241
10V
220
C116
10V470C585
0.1C586
4.7kR602
4.7kR603
10V470C587
0.1C588
0.1
C534
50V
10
C596
50V10C597
50V
10
C600
50V
10
C601
1M
R132
16 15 14 13 12 11 10 9
87654321
TC74VHC157FT(EKJ)
IC568
SELECT
1A
1B
1Y
2A
2B
2Y
GND3Y
3B
3A
4Y
4B
4A
/ST
VCC
JW563
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
27P
CN5051
AVDD(3.3V)
R-OUT
DACGND
L-OUT
AGND
/RST
BUS0
BUS1
BUS2
BUS3
BUCK
/CCE
REQ
SBSY
DGND
D-OUT
DVDD(3.3V)
VM(7V)
MGND
M-MUTE
LRCKIN
BCKIN
AIN
ST_REQ
GATE
CLK
DATA
0.1
C603
0.1
C604
0.1
C605
10kR621
10k
R620
10k
R622
10k
R623
10k
R624
10k
R625
10kR626
10k
R627
Q602
SELECT SWITCH
RT1N141C-TP-1
10k
R628
0.1
C609
33kR632
33kR630
1kR629
1kR631
10k
R640
10k
R641
10k
R642
16 15 14 13 12 11 10 9
87654321
BU4052BCF-E2
IC563
Y0
Y2
Y
Y3
Y1
INH
VEE
VSSA
B
X3
X0
X
X1
X2
VDD
16 15 14 13 12 11 10 9
87654321
BU4052BCF-E2
IC564
Y0
Y2
Y
Y3
Y1
INH
VEE
VSSB
A
X3
X0
X
X1
X2
VDD
R255
10k
R251
10k
560
R153
10k
R656
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
21P
CN5053
DATA
CLOCK
D0
D1
USB-S0
USB-S1
BCK
A-IN
GATE
REQ
ST-REQ
USB-RST
LRCK
DVSS
DVSS3.3V
BUS0
BUS1
BUS2
BUS3
BUCK
CCE
14 13 12 11 10 9 8
7654321
TC74HC4066AFT(EL)
IC567
1I/O
1O/I
2O/I
2I/O
2C
3C
GND3I/O
3O/I
4O/I
4I/O
4C
3C
VCC
14 13 12 11 10 9 8
7654321
TC74HC4066AFT(EL)
IC566
1I/O
1O/I
2O/I
2I/O
2C
3C
GND3I/O
3O/I
4O/I
4I/O
4C
1C
VCC
JW580
JW272
0
FB260
0
FB261
0
FB263
0
FB262
0FB507
0
FB509
0
FB512
6.8kR613
6.8kR612
820kR605
820kR606
820kR604
820kR608
820kR609
820kR607
1kR667
1kR668
S
2SK3378ENTL
Q608
S
2SK3378ENTL
Q610
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
17P
CN512
+9V
DGND
CTRL1
SELECTOR
AGND
INPUTL
AGND
INPUTR
AGND
OUTPUTR
AGND
OUTPUTL
AGND
S0
S1
S2
CTRL3
JW266
1k
R104
C108
0.022
C158
0.022
0.022
C615
C625
0.01
Q101
2SC2712-YG-TE85L
RT1N141C-TP-1
Q591
RT1N141C-TP-1
Q597 Q596
RT1N141C-TP-1
Q598
Q151
2SC2712-YG-TE85L
JW576
470kR616
470kR617
470kR614
470kR615
470kR669
470kR670
100kR643
100kR644
100kR649
100kR648100kR650
100kR654
3.3k
R267
3.3k
R266
3.3k
R265
3.3k
R264
2.7k
R270
2.7k
R271
1.8k
R269
1.8k
R268
R679
50V
3.3
C102
50V3.3C152
50V
3.3
C251
50V
3.3
C250
50V4.7C595
50V4.7
C594
50V4.7
C590
50V
4.7
C589
47k
R252
47k
R256
0.01
C264
JW260
C2420.1
C5
C4
C3
C2
C1
A16
A15
A14
A12
A11
A10
A9
A8
A7
A6
A5
A2
A1
A3
A4
A13
A17
F11
F10
F9
F8
F7
F6
F5
F4
F3
F2
F1
F12
0.22C163
0.22C162
LRCKIN
AIN
DATA
CLOCK
GATE
ST_REQ
DATA
CLOCK
AIN
GATE
ST_REQ
BCKIN
BCKIN
6
24
23
19
1
78
25
26
27
35
36
38
31
34
79
80
81
75
LRCKIN
77
18
7
28
82
22
21
39
5
3
2
TV IN
IC563
SIGNAL SELECTER
IC564
SIGNAL SELECTER
IC101
INPUT SELECT SWITCH,
IC201
SURROUND VOLUME CONTROL
IC568
SIGNAL SELECTER
IC567
SIGNAL SELECTER
IC566
SIGNAL SELECTER
MAIN BOARD (2/4)
GRAPHIC EQUALIZER CONTROL,
ELECTRICAL VOLUME
Q250,251
MUTE
Q596,597
SELECT SWITCH
Q598
EFFECTOR SELECT SWITCH
Q151
DBFB SWITCH
Q101
DBFB SWITCH
L
R
L
R
AUDIO
IN
VIDEO
IN
AUDIO
VIDEO
J101

4646
HCD-GTX88
HCD-GTX88
(Page 44) (Page 45)
(Page 47)
1
D
2
H
F
E
3 104 9
A
875
C
B
G
6
MAIN BOARD (1/4)
3 5
MAIN BOARD (2/4)
(4/4)
BOARD
MAIN
7
IC B/D
0.6
0
4.4
0
0
0
0.6
1.3
8.4
9
0[3.3]
3.1<0>
3.3
0
3.2
0.6
2.9
2.9
4.5
4.5
4.5
0
4.4
0.6
2.9
2.9
4.5
4.5
4.5
0
4.5
-0.9<-0.2>[0.7]
-0.9<-0.2>[0.7]
0
0
0.7[-8.7]
0.7[-8.7]
0
0
0 0.7[-8.6]
0.7[-8.6]
0
-0.9
<-0.2>
[8.9]
9
9[0]
9[0]
0[3.2]
4.8[0]
0[3.2]4.8[0]
0[9]
9
8.2[9]
8.9
[-8.7]
90.1[8.9]
0[3.2]
9[0]
9[6.8]
0
[0.2]
0.1
[-0.2]
0.1
[8.2]
0.01
C370
4700p
C371
10V
47
C374
0.01
C377
6800p
C379
1000p
C372
1000p
C373
3.3k
R370
4.7k
R371
4.7k
R374
47
R377
10k
R378
10
R379
2SD596-T1DV4
Q370
33
R386
47k
R395
4.7k
R394
RT1P137P-TP-1
Q378
100uH
L372
R373
0
6.8k
R380
10k
R391
2.2k
R397
R376
0
6.8k
R388
10k
R392
2.2k
R393
120p
C378
330p
C383
330p
C384
120p
C380
27mH
L370
27mH
L371
2SA1162-YG-TE85L
Q377
2.2k
R381
2.2k
R382
2.2k
R383
2.2k
R384
2.2k
R385
2.2k
R387
10k
R399
10k
R390
10k
R396
680p
C375
680p
C376
1 2 3 4 5 6 7 8 9 10
11
12
13
14
15
16
17
18
19
20
21222324252627282930
31
32
33
34
35
36
37
38
39
40
HA12237F
IC301
PB-NF2
(R)
PB-EQ(R)
EQOUT(R)
TA1(R)
PB-OUT(R)
NC
RECIN(R)
ALC(R)
NC
RECOUT(R)
ALCON/OFF
HIGH/NORMAL
A/B
MUTE ON/OFF
REC MUTE OFF/ON
VCC
ALC DET 1M
GND
I REF
TEST
RECOUT(L)
NC
ALC(L)
RECIN(L)
NC
PBOUT(L)
TA1(L)
EQOUT(L)
PB-EQ(L)
PB-NF2(L)
PB-NF1(L)
A IN(L)
RIP
B IN(L)
REC-RETN
GND
B IN(R)
NC
A IN(R)
PB-NF1(R)
16V
47
C359
50V10
C310
16V
47
C309
0.012
C301
0.1C303
2200p
C314
50V
10
C304
50V1
C305
50V
10
C311
50V
2.2
C306
3.3kR301
R302
3.3k
10k
R303
2.2k
R319
2.2k
R304
10k
R337
22k
R339
47k
R305
1
2
3
4
5
6
7
8
8P
CN507
GND
E-HOT
R-REC
GND
R-PB
L-REC
GND
L-PB
1
2
3
3P
CN503
R-PB
GND
L-PB
1200p
C381
1200p
C382
TP325 TP318
0.012C351
0.1C353
10C35450V
50V1C355
50V
2.2
C356
2200p
C364
3.3kR351
R352
3.3k10k
R353
2.2k
R369
10k
R357
2.2k
R354
47k
R355
TP309TP311
22k
R389
50V10
C361
TP338
TP320
100R312
0R311
100R310
4.7kR309
100R308
1M
R307
22k
R306
10V470
C308
50V
10
C307
50V10C312
1
2
3
3P
CN510
L
GND
R
6
2
1
3
5
4
T301
TRANSFORMER
BIAS OSCILLATION
0JR114
0.022
C385
0.022
C386
JW584
10k
R356
10k
R336
18k
R375
18k
R372
Q374
2SD2704K-T146
Q373
2SD2704K-T146
Q372
2SD2704K-T146
Q371
2SD2704K-T146
Q375
2SD2704K-T146
Q376
2SD2704K-T146
RT1N141C-TP-1
Q379
RT1N141C-TP-1
Q381
RT1N141C-TP-1
Q383
RT1P141C-TP-1
Q382
RT1N141C-TP-1
Q380
C1
C2
C3
C4
C5
D1
D3
B1
B2
60
59
55
56
57
58
MAIN BOARD (3/4)
DECK A/B SELECT,
IC301
HP901
PB HEAD
(DECK A)
PB
(L-CH)
PB
(R-CH)
HRPE901
REC/PB/ERASE
HEAD
(DECK B)
REC/PB
(L-CH)
REC/PB
(R-CH)
ERASE
PB/REC EQUALIZER AMP
Q371-376
MUIE
Q377,379,381
MUTE CONTROL SWITCH
Q382,383
TC PB MUTE CONTROL SWITCH
Q370
BIAS OSC
Q378,380
REC BIAS CONTROL SWITCH
TEST
PIN

47 47
HCD-GTX88
HCD-GTX88
(Page 55)
(Page 44)
(Page 59)
(Page 63)
(Page 45)
(Page 46)
(Page 61)
(Page 59)
(Page 51)
114 126
H
A
8
F
103 14
E
G
C
J
D
132
B
1 5 7
I
9
CN600
S
POWER
BOARD
CN906
F
PANEL
BOARD
CN1214
K
TRANS
BOARD
(3/4)
7
MAIN
BOARD
MAIN BOARD (1/4)
4 6
MAIN BOARD (2/4)
BOARD
I
SUBWOOFER
CN700
BOARD
H
POWER
CN601
BOARD
C
USB
CN901
IC B/D
IC B/D IC B/D
16.3
7
0
0.7
12.6
13.2
16.5
16.5
9.1
9.1
16.5
0
3.4
16.5
0
3.4
0.4
16.5
9
0
9
5.2
0.2
16.5
16.5
0
3.2
-0.9
13.3
0.7
0
7
0.7
0.1
13.3
16.5 12.6
0
-6.7
-6.7
0
7.6
4
4.6
-6.7
0
E2,E51 MODEL
EXCEPT AUS MODEL
‘
‘
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
17P
CN508
GC RESET
11C-CLK
11C-DATA
SIRCS
KEY INT DISPLAY
KEYINTPOWER
POWERLED
GCDGND
LED+9V
LEDGND
NOUSE
EVER +4V
VF(2)
VF(1)
VG
SPEANEGND
SPEANA
0
R1112SC5053T100Q
Q325
680
R325
CN102
SW-LED
SWVOL
DGND
+9V
1
R108
R659 100
2SD2114KT146
Q180
2SD2114KT146
Q181
47k
R182
47k
R183
1k
R184
1k
R185
50V
4.7
C180
50V
4.7
C181
0.1
C580
2SD2525(TP)
Q585
1k
R575
1k
R578
HZU2.0BTRF
D584
0.1
C583
0.1
C582
1k
R588
1
2
3
4
5
6
7
8
8P
CN502
L-IN
PREGND
R-IN
DCDETECT
OVERLOADDETECT
THERMALVACS
STKMUTE
HPMUTE
1.8k
R553
56k
R551
25V
1000
C553
50V
2.2
C552
16V100C550
0.1
C551
123
456
RT8H015C-T112-1
IC550
1
2
3
4
5
6
7
8
9
10
11
12
13
13P
CN501
FRONTRELAY
LINKRELAY
ACCUTDETECT
A+9V
FANDET
FR RY PROTECT
DBFB FB
POWER-GND
POWER-GND
DGND
UNREG
-B
-B
25V
4700
C566
0.01
C561
0.01
C560
10V
470
C563
0.1
C564
16V
100
C562
0.1
C565
JW566
VCC
GND
OUT
BA09T
IC560
VCC
GND
OUT
BA09T
IC561
TP947
JW567
0
R112
R326
1k
0.1
C581
5P
J103
L+R
D+4V
IIC DATA
IIC CLK
DGND
1
2
3
3P
CN580
FAN +
FAN -
1
3
4
5
6
7
7P
NO503
DGND
-VG
VF(1)
VF(2)
AC3
AC3
CLP01 CLP02 CLP03 CLP04 CLP05 CLP06 CLP07
1 2 3 4
IC565
PQ05RD21J00H
VIN
VOUT
GND
VC
10k
R610
10k
R611
0.1C592
1
2
2P
NO504
USB +5V
GND
D595
MC2837
R637 100
10k
R577
1k
R181
1k
R180
MA111-TX
D101
MA111-TX
D102
MA111-TX
D550
D591
RB501V-40TE-17
Q607
2SD2114KT146
50V
2.2
C620
1k
R666
1
C621
47k
R664
2.2k
R665
1
2
3
4
5
6
7
8
8P
CN513
SWOUT
SWA-GND
SWRY
STKMUTE
UNREG
UNREG
OVERLOAD
DCDETECT
UDZW-TE17-6.8B
D583
UDZW-TE17-4.7B
D325
D540
RECT
D5SBA60
10k
R187
10k
R186
UDZW-TE17-6.2B
D581
C59110V470
C574
100
16V
0.1
C573
JL001 JL002 JL003 JL004
1 2 3 4
IC570
PQ09RD21J00H
RT1N430C-TP-1
Q550
D551
MA111-TX
RT1N141C-TP-1
Q603
RT1N141C-TP-1
Q590 Q580
2SC2712-YG-TE85L
Q581
2SC2712-YG-TE85L
RT1N430C-TP-1
Q584
Q582
2SC2712-YG-TE85L
Q587
2SD2525
1
2
3
CN581
3P
FAN +
FAN -
JW522
JW572
2.2k
R594
2.2k
R591
10k
R597
10k
R596
4.7k
R590
4.7k
R584
D582
UDZW-TE17-13B
Q588
2SC2712-YG-TE85L2SC2712-YG-TE85L
Q586
R589
100k
JW185
JW577
JW585
D3
D1
E10
E9
E8
E7
E6
E5
E4
E3
E2
E1
F1
F2
F3
F4
F6
F7
F8
F9
F10
F11
F6
F12
EPT560
(CHASSIS)
EPT561
(CHASSIS)
70
71
40
33
88
95
97
67
72
69
68
67
94
37
29
30
4
73
74
3301
TC BIAS GND
GCDGND
MGND
AGND
LIGHTINGGND
CENTERGND
POWERGND
RPOTECTORGND
FANGND
REGULATORGND
SWDGND
LEDGND
DGND
MCDGND
USBGND
AA
SUBTRANSGND
SPEANAGND
MAIN BOARD (4/4)
+9V REG
IC561
IC560
+9V REG
IC570
USB+9VREG
IC565
USB+5VREG
PROTECTOR
IC550
FAN +
DCFAN
M892
VIN
VOUT
GND
VC
DCFAN
M891
FAN +
Q587
FAN DRIVE
Q586,588
FANDETECT
Q590,603
USBPOWERCONTROLSWITCH
Q584
FANCONTROLSWITCH
Q580,582
FANDETECT
Q581
FAN HI SPEED CONTROL SWITCH
Q585
FAN DRIVE
MUTE
Q180,181
D+4VSWITCH
Q325
OVERVOLTAGE
Q550
DETECTSWITCH
CONTROL
SYSTEM
MUTE
Q607
CN102
SYNCOUT
D-LIGHT
J103
1
2
3
1
2
3

4848
HCD-GTX88
HCD-GTX88
6-16. PRINTED WIRING BOARD — MAIN SECTION — • Refer to page 37 for Circuit Boards Location. : Uses unleaded solder.
Ref. No. Location
D101 H-11
D102 H-10
D325 G-11
D340 E-2
D342 D-3
D402 D-5
D501 C-4
D502 B-4
D503 C-4
D504 C-4
D540 H-7
D550 G-10
D551 G-10
D561 F-8
D562 F-8
D581 G-10
D582 E-4
D583 G-10
D584 G-10
D585 C-4
D590 D-6
D591 G-6
D592 F-8
D593 F-8
D594 E-6
D595 H-3
IC101 D-8
IC201 D-10
IC301 F-4
IC401 C-3
IC402 B-4
IC550 G-10
IC560 G-7
IC561 F-7
IC562 D-6
IC563 B-10
IC564 C-9
IC565 G-6
IC566 C-6
IC567 C-6
IC568 C-7
IC569 G-8
IC570 F-8
Q101 C-7
Q151 C-7
Q180 H-8
Q181 H-8
Q250 C-8
Q251 B-8
• Semiconductor Location
Q325 H-11
Q340 E-2
Q341 D-3
Q342 D-3
Q343 D-2
Q344 D-3
Q345 D-2
Q370 H-4
Q371 G-3
Q372 G-3
Q373 G-4
Q374 G-3
Q375 G-4
Q376 G-4
Q377 G-4
Q378 H-4
Q379 G-4
Q380 H-4
Q381 G-4
Q382 G-4
Q383 G-4
Q501 B-4
Q506 D-2
Q540 E-4
Q544 E-4
Q550 G-10
Q560 C-6
Q561 C-6
Q580 G-10
Q581 G-11
Q582 G-10
Q583 B-2
Q584 F-10
Q585 F-10
Q586 E-5
Q587 E-4
Q588 E-5
Q590 F-6
Q591 D-8
Q596 B-10
Q597 B-10
Q598 C-9
Q602 C-6
Q603 F-6
Q604 F-8
Q605 G-8
Q606 G-8
Q607 D-5
Q608 C-8
Q610 D-9
Ref. No. Location
1
A
B
C
D
E
F
G
H
I
2 3 4 5 6 7 8 9 10 11 12
1
1
3
3
4 5
3
1 4
1
1
10
31 30
50
51
80 81
100
1
2
26
2720
2112
1
1 3
4
1
4
1
7
3
1
2
113 18
13
1 9
82
1
21
31
20
40
30 11
10
1
8
1
2
16
17
1
210
11
B
E
1 3
1
2 12
13
2
1
16
17
1 8
1
3
1
2
3
4
5
1 3
46
1 8
916
42
121
22
BE
BE
BE
42
121
22
R400
JW370
JW564
JW758
R401
JW371
JW565
JW759
JW566
R402
JW372
JW567
R403
JW373
JW568
R404
JW374
R405
CLP01
JW375
R406
CLP02
JW376
R407
CLP03
JW377
JR363
CLP04
JW378
JR364
JW760
JW185
D561
R409
CLP05
JW379
JW761
D562
CLP06
JR366
JW762
CLP07
JR367
JW763
JW570
JW764
JW765
JW766
R602
JW572
R603
JW767
R604
JW380
JW768
R411
R605
JW381
JW769
JW576
R412
R606
JW577
R413
R607
JW383
R220
R608
JW384
JW578
R221
NO401
R609
JW385
NO402
JW386
R417
NO403
JW387
IC550
R418
JW388
JW770
R419
JW771
R228
R610
JW580
JW774
R229
R611
JW775
CN402
R612
JW776
R613
JW777
JW584
R420
R614
JW390
JW778
R421
R615
JW391
JW585
JW779
R422
R616
JW392
JW586
R423
R617
JW393
JW587
R424
JW394
JW588
R425
JW589
R426
JW396
R427
JW397
IC560
R428
HS560
JW398
D581
IC561
R429
HS561
D582
IC562
HS562
JW782
D583
IC563
HS563
JW783
D584
R620
IC564
JW590
HS564
JW784
HS565
1
1313
4
14
D585
R621
IC565
JW591
JW785
R622
IC566
JW592
JW786
R623
IC567
JW593
JW787
R430
R624
IC568
JW594
JW788
R431
R625
IC569
JW595
JW789
R432
C202
R626
JW596
R433
C203
R627
JW597
R434
C204
R628
JW598
R435
C205
R629
JW599
R436
C206
C207
R438
D590
JW790
IC570
R439
D591
JW791
D592
JW792
D593
R630
D594
R631
D595
R632
R440
R441
C405
JL001
R442
JL002R443
R637
JL003
FB260
R250
R444
JL004
FB261
R251
R445
FB262
R252
R446
FB263
R447
R448
C600
R255
R449
C601
R256
R257
C603
C410
C604
R640
C411X401
C605
R641
C412
X402
R642
R643
C220
C608
R644
C221
C609
C222
C416
C223
C417 R648
R261
TP309
R649
R262
R264
R265
TP501
R266
TP502
R267
R268
C614
R650
R269
TP311
C615
C230
R654
C231
R656
R463
R270
TP318
R271
R659
R272
R273
R467
C620
R468
C621
R469
R660
TP320
R661
C625
R662
R663
R664
R470
C240
R665
TP325
C241
R471
R666
R472
C242
R667
R473
R668
R474
R669
R475
R477
R478
E2,E51
MODEL
AUS,AR
MODEL
R670
R672
R673
C250
C251
R484
TP338
JW200
R485
JW201
R486
JW202
R293
R487
R294
R488
R295
R489
Q101
R296
R297
R490
C260
JW400
C261
R491
JW401
R492
C262
JW402
R493
C263
JW403
C264
JW404
R495
JW405
R497
JW407
JW408
JW409
JW600
JW601
C462
D402
JW602
JW603
C464
JW410
JW604
Q501
JW411
JW605
JW412
JW606
JW413
JW607
JW414
JW608
JR400
JW415
JW609Q506
JW416
JW417
EPT560
JW418
EPT561
JW419
JW610
CN5051
JW611
JW612
CN5053
JW613
C280
JW420
JW614
JR600
C281
IC201
JW421
JW615
JW422
JW616
JW423
JW617
JW424
JW618
JW619
JW426
TP947
JW427
JW428
Q325
JW429
JW620
IC401
JW621
IC402
JW622
JW623
JW430
JW624
JW431
JW625
JW432
JW626
JW433
JW627
JW434
JW628
JW435
JW629
JW436
JW437
JW438
JW439
JW630
JW631
JW632
JW633
JW440
JW634
JW441
JW635
JW442
JW636
C497
JW443
JW637
C498
Q340
E C B
E C B E C B
JW444
JW638
C499
Q341
JW445
JW639
Q342
JW446
Q343
JW447
Q344
JW448
Q151
Q345
JW449
JW640
JW641
JW642
JW643
Q540
JW450
JW644
JW451
JW645
JW452
JW646
JW453
JW647
JW260
Q544
JW454
JW648
JW455
JW649
JW456
JW457
JW458
R101
JW459
JW266
R102
R103
R104
JW650
R105
JW651
R106
JW652
R107
JW653
Q550
R108
JW460
JW654
JW461
JW655
JW462
JW656
JW463
JW657
JW464
JW658
R301
JW465
JW659
JW272
R302
JW466
FB507
R303
JW467
R304
JW468
R111
FB509
R305
JW469
R112
R306
R307
R308
JW660
R309
JW661
R116
JW662
JW663
Q560
R500
JW470
JW664
Q561
R119
R501
JW665
FB512
R502
JW666
JW472
R503
JW473
JW667
Q370
R310
CN100
JW474
JW668
Q371
R311
JW475
JW669
Q372
R312
CN102
JW476
Q373
JW477
Q180
Q374
R508
JW478
Q181
Q375
R121
R509
JW479
Q376
R122
Q377
Q378
E C B
JW670
Q379
R319
JW671
JW672
JW673
JW480
JW674
R510
JW481
JW675
JW482
JW676
JW483
JW677
Q380
JW484
JW678
Q381
JW485
JW679
Q382
JW486
Q383
NO503JW487
L370
R130
NO504
JW488
L371
R131
R325
JW489
L372
R132
R326
R133
JW680
CN501
JW681
CN502
JW682
CN503
JW683
Q580
JW490
JW684
Q581
JW491
JW685
Q582
CN506
JW492
JW686
Q583
CN507
JW493
JW687
Q584
CN508
C100
JW494
JW688
Q585
CN509
JW495
JW689
Q586
C102
JW496
Q587
C103
JW497
Q588
FB150
R140
C104
JW498
R529
C105
JW499
R336
C106
R337
C107
CN510
C108
JW690
R339
CN511
C109
JW691
JW692
CN512
CN513
JW693
R530
Q590
JW694
R531
C301
Q591
JW695
R532
JW696
C303
JW697
R340
C110
C304
JW698
R341
C111
C305
JW699
R342
C112
C306
Q596
R343
C113
C307
R537
Q597
R150
R344
C308
Q598
R151
R345
C115
C309
R152
R346
C116
R153
R347
R154
R348
R155
R349
C501
R156
C502
R157
C503
R540
C310
C311
TP201
R541
R542
C312
TP202
TP203
C314
TP204
R351
TP205
R352
R546
TP206
R353
R547
TP207
R354
R548
TP208
R355
TP209
R356 R357
C511
R166
TP210
R551
TP211
TP212
R553
TP213
C130
C131
C520
R369
R560
R561
R562
R563
R370
C140
R371
R372R373
R180
R374
R181
R375
R182
R376
R183
R377
R184
R378
R185
R379
C149
R186
R187
C340
C534
C341
C535
C536
R573
R380
R574
C150
R381
R575C539
R382
C152
R383
R577
C153
R384
R578
C154
R385
C155
R386
C156
R387
C157
R388
C158
C540
R389
C159
C541
C544
R581
C351
C545
R582
C353
R584
R390
C160
C354
JW300
R391
C161
C355
D101
E C B
JW301
R392
C356
D102
C162
JW302
R586
R393
C163
JW303
R587
R394
R588
JW304
R395
R589
C359
JW305
R396
JW306
R397
JW307
C550
JW308
R399
C551
JW309
C552
C553
R590
JW500
C361
R591
R592
R593
JW503
R594
C364
JW310
JW504
R595
JW311
R596
JW312
JW506
R597
JW313
JW507
JW314
JW508
JR300
JW315
JW509
JR301
JW316
JW317
CN580
C560
JW318
JW700
JR304
CN581
C561
D501
JW319
JW701
JR305
C562
D502
JW702
C563
D503
JW703
JR307
C370
C564
D504
JR114
JW510
JW704
C371
C565
JW511
JW705
JR309
C372
C566
Q602
JW512
JW706
C373
C567
Q603
JW513
JW707
Q604
C180
C374
C568
JW320
JW514
JW708
Q605
C181
C375
IC101
JW321
JW515
JW709
Q606
C376
JW322
JW516
Q607
C377
JW323
E2
MODEL
JW517
C378
JW324
JW518
JR310
Q608
C379
JW325
JW519
JW326
JW327
JR313
JW328
JW710
JR314
JW329
JW711
JW712
JR316
JW713
JR317
C573
C380
JR318
Q610
C574
C381
IC301
JW521
JW715
JR319
C382
JW522
JW716
C383
JW523
JW717
C384
JW330
JW718
JW524
C385
JR129
D325
T301
JW331
JW525
JW719
C386
JW332
JW526
JW333
JW527
JW334
JW528
JR320
JW335
JW529
JW336
JR322
JW337
JR323
C580
JW338
JW720
C581
JR131
JW339
JW721
C582
JW722
C583
JW723
C584
JW530
JW724
C585
JW531
JW725
JR329
C586
JW532JW726
C587
JW533
JW727
C588
JW340
JW534
JW728
C589
JW341
JW535
JW729
JW536
JW343
JW537
JW344
JW538
JR330
JW345
JW539
JW346
JW347
JR333
C590
JW348
JW730
C591
JW349
JW731
JR335
C592
JW732
JR336
JW733
JR337
D340
C594
JW540
JW734
JR338
J101
C595
JW541
JW735
JR339
D342
C596
JW542
JW736
J103
C597
JW543
JW737
JW544JW738
JW351
JW545
JW739
JW352
JW546
JW353
JW547
Q250
JW354
JW548
Q251
JW355
JW549
JW356
JR342
JW357
D540
JW358
JW740
JR344
JW359
JW741
JR345
JW742
JW743
JR347
JW550
JW744
JW551
JW745
JR349
JW552
JW553
JW747
JW360
JW554
JW748
JW361
JW555
JW749
JW362
JW556
JW363
JW557
JW364
JW558
JW365
JW559
JR351
JW366
R203
JW367
JR353
D550
R204
JW368
JW750
JR354
D551
R205
JW369
JW751
JW752
JW753
JW754
JR358
JW561
JW755
JR359
JW562
JW756
JW563
JW757
MAIN BOARD
1-872-263- (11)
11
BE
11 7 7
8 814 14
1 8
916
18
9 16
AUDIO
IN
AUDIO
R
–2
–1
–4
–3
L
J101
D-LIGHT
SYNC OUT
J103
(CHASSIS)(CHASSIS)
DRIVER BOARD CN701
TRANS BOARD CN1214
USB
BOARD
CN907
BD91
BOARD
CN202
PANEL
BOARD
CN906
USB BOARD CN901 POWER BOARD CN601POWER BOARD CN600
SUBWOOFER
BOARD
CN700
ERASE
HRPE901
REC/PB/ERASE
HEAD
(DECK B)
REC/PB
(R-CH)
HP901
PB HEAD
(DECK A)
PB
(L-CH)
PB
(R-CH)
REC/PB
(L-CH)
CN503
CN507
TU901
FM/AM
TUNER PACK
M892
DC FAN
TAPE
MECHANISM
DECK
CN102
SYSTEM
CONTROL
M891
DC FAN
PRIMARY
BOARD
CN1200
MIC
BOARD
N0902
EFFECTOR
BOARD
CN1502
F
B
C HK S
D G
I
J
A
E
VIDEO
IN
VIDEO
R
L
X402
E2,E51
MODEL
1 3
E2,E51
MODEL
EXCEPT AUS MODEL
(Page 52)
(Page 40)(Page 56)(Page 50)
(Page 42)
(Page 54)
(Page 62)
(Page 60)
(Page 50) (Page 62) (Page 58) (Page 58)

49 49
HCD-GTX88
HCD-GTX88
(Page 55)
(Page 51)
(Page 50)
(Page 54)
6-17. PRINTED WIRING BOARD — USB CONNECTOR SECTION —
• Refer to page 37 for Circuit Boards Location. : Uses unleaded solder.
6-18. SCHEMATIC DIAGRAM — USB CONNECTOR SECTION —
1
A
B
C
D
E
F
G
H
I
2 3 4 5 6 7
L
M
USB BOARD CN903
PANEL
BOARD
CN956
5 1
2
1
14
D955
REC/ERASE EP951
JW1091
JW1092
TP981
TP982 TP985
TP986
TP987
TP988
TP989
TP990
R932
NO953
NO958
CN952
CN952
(USB)
R591
C967
C968
1-872-684- (12)
12
USB CONNECTOR
BOARD
(CHASSIS)
1
A
3
B
42
TP989
TP990
TP988
TP981
10
C968
TP985
TP982 TP987
TP986
D955
SELU2610C-STP6
10V
220
C967
1
2
3
4
5
5P
NO953
VBUS
D-
D+
GND
SHIELD0
R591
0
R932
4P
CN952
1
VBUS
2
D-
3
D+
4
GND
1
2
2P
NO958
USB LED
SEL A
EP951
(CHASSIS)
USB CONNECTOR BOARD
BOARD
PANEL
M CN956
BOARD
USB
L CN903
REC/ERASE
(USB)
CN952

5050
HCD-GTX88
HCD-GTX88
6-19. PRINTED WIRING BOARD — USB SECTION — • Refer to page 37 for Circuit Boards Location. : Uses unleaded solder.
(Page 48)
(Page 48)
(Page 49)
1
A
B
C
D
E
F
2 3 4 5 6 7 8 9 10 11 12 13 14
1
54
3
1 7
1
2
1
21
1
22 23
44
15
125
26
50
51 75
76
100
C917
IC915
R985
R977
CN907
X901
C901
C903C902 C904
C905
C906
C907
C908
C909
C910
C912
C913C915C916
C921
C919
C922
R937
R901
R938
R913
R915
R919
R928
R932
R934
R986
CN904
R922
CN901
R981
R983
R978
R979
R982
R984
R976
B4
JR902
D901
D902
FB901
FB902
IC901
IC921
RB921
RB922
RB923RB924
CN903
C914
R950
R902
R903
R904
R905
R906
R907
R916
R917
R920
R921
R923
R924
R925
R926
R933
R941
R942R943
R944
C920
R945
R947
C930
R973
R972
R971
R970
R975
R974
W901
1-872-405- (12)
12
1-872-405- (12)
12
MAIN
BOARD
NO504
C
USB CONNECTOR BOARD
NO953
L
MAIN
BOARD
CN5053
D
Ref. No. Location
D901 D-13
D902 D-13
IC901 C-12
IC915 B-2
IC921 C-10
• Semiconductor
Location

51 51
HCD-GTX88
HCD-GTX88
6-20. SCHEMATIC DIAGRAM — USB SECTION — • Refer to page 75 for IC Pin Description of IC901.
(Page 47)
(Page 49)
(Page 45)
IC B/D
TP903
TP904
TP906 TP907
TP908
TP909
TP910
TP911
TP912
TP913
TP914
TP915
TP917
TP952
TP953
TP954
TP955
TP956
TP957
TP958
TP959
TP960
TP961
TP962
TP963
TP918
TP919
TP920
TP921
TP991
TP992
JR902
C903C902C904
R901
R902
R903
R904
R905
R906
R907
R915
R916
R917
R920 R921
R925R926
R941
R942
R943
R944
R970
R971
R972
R973
R974
R975
R937
R938
R976
R977
R978
R979
R981
R982
R983
R984
R932
TP902
TP905
TP901
R934
CN904
C901
C915
C914 C913
C920
C912 C910 C909
C916
C908
C905
C906
C907
C922 C921
R913
R919
X901
R933
R928
FB901
FB902
C917C930
C919
R923
R924
TP916
R922D902
D901
CN903
CN901
RB922
RB921
RB924
RB923
CN907
W901
IC915
R986
R985
R945
R947
R950
IC921
IC901

5252
HCD-GTX88
HCD-GTX88
6-21. PRINTED WIRING BOARD — EFFECTOR SECTION — • Refer to page 37 for Circuit Boards Location. : Uses unleaded solder.
(Page 48)
1
A
B
C
D
E
F
G
H
I
2 3 4 5 6 7 8 9 10 11
1
89
16
1
45
8
1
89
16
1
45
8
Q1508
Q1509
Q1513
R1516
R1598
R1585R1586
R1584
C1529
IC1503
R1535
R1537
R1534
Q1502
R1592
R1538
R1522
R1520
R1519
Q1500
R1532
R1531
C1520
C1518
R1546
R1512
C1517
IC1500
IC1501
C1513
R1508
R1529
C1509
R1528
R1526
C1521
C1527
R1510
C1522
R1514
R1515
R1533
R1530
R1505
C1538
Q1506
R1594
R1589
R1570
R1590
R1566
R1567
R1569
JR1601
R1573
C1548
R1572
R1571
IC1505
R1582
R1581
R1591
R1580
R1595
R1579
R1574
R1575
C1555R1576
R1565
R1568
C1568
D1502
Q1507
R1547
R1504
C1572
R1500
R1501
17
16
1 2
R1527
R1507
R1502
R1536
C1571R1602
R1603
R1600
R1601
R1604
R1605
R1606
R1607
C1600
JR1503
JR1502JR1600
JR1501
R1525
JW1500
JW1507
JW1520
JW1524
JW1525
JW1526
JW1528
JW1529
JW1533
JW1537
JW1542
JW1544
JW1545
JW1547
JW1548
JW1549JW1550
JW1551
JW1557
JW1558
JW1508
JW1560
JW1527
JW1555
JW1552
JW1561
JW1531
JW1532
JW1511
JW1510
JW1538
JW1539
JW1505
JW1553
JW1540
JW1514
JW1513
JW1517
JW1512
JW1503
JW1502
JW1504
CN1502
JW1530
C1542
C1526
C1544
EP1500
C1530
EP1501
JW1522
JW1534
JW1515
JW1546
C1506
C1507
L1500
JW1521
JW1559
JW1523
JW1519
JW1556
JW1570
JW1571
JW1518
JW1599
C1524
C1525
C1559
C1554
C1552
C1546
C1545
C1584
C1561
C1562
C1528
C1515
C1560
JW1541
C1512 C1519
JW1562
JW1536
JW1535
1-868-596- (15)
13
MAIN
BOARD
CN512
E
(CHASSIS) (CHASSIS)
R1511
C1602
C1576
C1601
C1569
Ref. No. Location
D1502 C-8
IC1500 F-4
IC1501 H-4
IC1503 F-2
IC1505 G-7
Q1500 G-2
Q1502 H-2
Q1506 H-7
Q1507 C-8
Q1508 E-7
Q1509 B-1
Q1513 B-4
• Semiconductor
Location

53 53
HCD-GTX88
HCD-GTX88
6-22. SCHEMATIC DIAGRAM — EFFECTOR SECTION — • Refer to page 68 for IC Block Diagrams.
(Page 45)
MAIN
BOARD
(2/4)
CN512
E
2.8
IC1505(2/2)
IC1501
C1513
C1517
R1512R1511
C1520
R1546
C1518
C1521
R1514 R1515
C1527
R1510
C1522
C1519
C1529
R1565
R1566 C1554
R1567
R1568
R1570 C1546
R1569
C1545
C1548
R1571 R1572
C1552
R1589
C1555
C1559
C1560
R1500
R1504
R1525
R1502
R1501
C1572C1568
R1547
C1584 C1571
JR1601
C1576
R1582
R1579
C1561
R1580
R1581 C1562
R1532
R1531
R1530
R1533
R1584
R1585
R1586
R1529
C1509
R1505 C1507
C1506R1526
C1512
R1590
C1542
R1520
R1519
R1522
R1538
R1592
C1526
C1530
C1515
C1524
C1525
R1576
R1574
R1575
R1573
D1502
R1527
CN1502
JW1513
R1508
JW1510
JW1511
JW
JW
IC1503
R1534
R1536
R1537
R1535
C1544
R1591
Q1506
Q1502
Q1508
Q1507
IC1505(1/2)
R1528
NJM4565M
M65850FP-E1
0.1
0.0015
18k18k
330p
18k
0.068
330p
18k 18k
0.068
18k
0.0015
1
50V
0.01
2.2k
2.2k
R1607
22k
10
50V
22k
22k
R1594
18k
R1595
18k
100k 10
50V
100k
10
50V 47p
100k 1k
10
50V
33
47p
10
50V
10
50V
100
100
100
100
100
0.10.1
10k
100 0.1
R1600
27k
R1598
JR1501
0
0
JR1503
JR1502
0
10k
R1507
100
L1500
10uH
R1516
10k
C1600
0.1
0
JW
C1601
JW
C1602
JW
100k
100k
10
50V22k
22k 10
50V
820
470
330
1.2k
0
0
0
100k
1p
10k 0.068
0.06810k
10
50V
BP
47k
R1604
22k R1605
22k
R1606
22k
0.0047
0
39k
0
27k
0
0.1
0.033
47
10V
C1528
47
50V
0.22
50V
0.22
50V
3.3k
100k
1k
3.3k
UDZW-TE17-6.2B
100
17P
Q1513
RT1N141C-TP-1
BUFFER
Q1509
RT1N141C-TP-1
BUFFER
10k
TC74LVX4051FT
1.8k
3.9k
47k
2.7k
10V
0.0047
47k
2SK3378ENTL
SWITCH
2SK3378ENTL
SWITCH
Q1500
2SK3378ENTL
SWITCH
2SK3378ENTL
SWITCH
2SC5053T100Q
B+ SWITCH
R1602
27k
NJM4565M
100k
S0
S1
S2
S2
S1
S0
MIXER
DIGITAL DELAY
IC1500
NJM4565M
MIXER R MIXER L
MULTIPLEXER
R1601
100k
JR1600
0
C1569
JW
R1603
100k

5454
HCD-GTX88
HCD-GTX88
6-23. PRINTED WIRING BOARD — PANEL SECTION — • Refer to page 37 for Circuit Boards Location. : Uses unleaded solder.
(Page 48)
(Page 56) (Page 49)
1
A
B
C
D
E
F
G
H
2 3 4 5 6 7 8 9 10 11 12 13 14
2
16
17
JW957
JW976
ND900
CN900
CN906
X900
C924
C926
C927
C928
C932
C935
CN956
CN957
JW901
JW910
C965
C966
IC901
C984
JW944
JW945
JW946
JW947
JW970
JW903
JW978
JW979
JW981
JW966
JW950
JW907
JW943
JW919
JW920
JW912
JW913
JW921
JW928
JW926
JW933
JW934
JW932
JW938
JW908
JW949
JW952
JW930
JW942
JW935
JW960
JW953
JW955
JW940
JW905
JW962
JW958
JW917
JW975
JW954
JW904
JW965
JW967
JW968
JW948
JW939
JW973
JW974
JW961
JW937
JW969
JW902
JW963
JW915
JW956
JW951
JW909
JW929
JW927
JW924
JW922
JW985
JW986
JW984
JW987
JW983
JW982
JW925
JW911
JW923
JW931
JW914
JW980
64
70 6
65 7 1
1 3
1
8
2
1
24
25 Q900
Q901
Q902
Q903
Q917
Q918 Q919
Q920
R1012
R1013
R1014
R929
R930
R931
R933R934
R935
R937
R938
R939
C900
C901
C902
C903
C904
R940
C905
C906
R942
C907
R943
C908
R944
C909
R945
R946
R948
R949
C910
C911
C912
C913
C914
C915
R951
C916
R952
C917
R953
C918
C919
C920
C921
C922
R1072
C923
R1073
R1074
C925
R1075
R962
R1076
R963
R966
R967
R968
R969
C930
C931
C933
C934
R970
R971
C936
R972
C937
R973
C938
R974
C939
R976
R977
R979
C940C941
C942
C944
R981
C946
R982
R983
C951
C952
C953
C954
C956
C957
C958
C959
D900
C960
C961
C962
C963
C964
C974
C979
IC900
C985
IC902
JR900
JR901
D902
D903D901
JR903
2 1
BOARDPANEL
N
FUNCTION
BOARD
CN950
F
MAIN
BOARD
CN508
M
USB CONNECTOR
BOARD
NO958
JW964
1
R975
E
1
100
3031
8180
50
51
11 20
110
E
E
E
EEE
E
12
(12)1-872-593-
Ref. No. Location
D900 D-4
D901 F-11
D902 C-5
D903 F-11
IC900 F-8
IC901 B-14
IC902 F-3
• Semiconductor Location
Q900 G-12
Q901 F-12
Q902 G-12
Q903 F-12
Q917 E-11
Q918 E-11
Q919 E-11
Q920 B-3
Ref. No. Location

Sony hcd-gtx88

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