Sony HCD-GTR88 User manual

SERVICEMANUAL
Sony Corporation
Audio & Video Business Group
Published by Sony EMCS (Malaysia) PG Tec
HCD-GTR88
COMPACTDISCDECKRECEIVER
9-890-544-01
2010D08-1
© 2010.04
E Model
Australian Model
Ver. 1.0 2010.04
• HCD-GTR88 is the amplifier, USB, CD player,
tuner and tape deck (only E4 Model) section in
MHC-GTR88. Photo: HCD-GTR88 (E4 Model)
CD Section Model Name Using Similar Mechanism HCD-GTZ4/GTZ4i/GTZ5 CD Mechanism Type CDM88BL-DVBU101
Optical Pick-up Name KHM-313CAB/C2NP
Tape Deck Section
(only for E4 Model) Model Name Using Similar Mechanism HCD-GT111/GT222/GT444/GT555
Tape Mechanism Type CS-21SC-900TP
SPECIFICATIONS
Amplifier section
The following are measured at
Mexican model:
AC 127 V, 60 Hz
Other models:
AC 120 V, 220 V, 240 V, 50/60 Hz
Front/Satellite Speaker
Power Output (rated):
200 W+ 200 W(at 6 , 1 kHz,
1% THD)
Front Speaker
RMS output power (reference):
345 W+ 345 W(per channel at 8 ,
1 kHz)
Satellite Speaker
RMS output power (reference):
140 W+ 140 W(per channel at 24 ,
1 kHz)
Subwoofer
RMS output power (reference):
200 W+ 200 W(per channel at 6 ,
100 Hz)
Inputs
PC (AUDIO IN) L/R
Voltage 700 mV, impedance 47 kilohms
MIC
Sensitivity 1 mV, impedance 10 kilohms
(USB) port: Type A
Outputs
PHONES
Accepts headphones of 8 or more
USB section
Supported bit rate
MP3 (MPEG 1 Audio Layer-3):
32 kbps – 320 kbps, VBR
WMA: 48 kbps – 192 kbps
AAC: 48 kbps – 320 kbps
Sampling frequencies
MP3 (MPEG 1 Audio Layer-3):
32 kHz/44.1 kHz/48 kHz
WMA: 44.1 kHz
AAC: 44.1 kHz
Transfer speed
Full-Speed
Supported USB device
Mass Storage Class
Maximum current
500 mA
Disc player section
System
Compact disc and digital audio system
Laser Diode Properties
Emission Duration: Continuous
Laser Output*: Less than 44.6 W
* This output is the value measurement
at a distance of 200 mm from the
objective lens surface on the Optical
Pick-up Block with 7 mm aperture.
Frequency response
20 Hz – 20 kHz
Signal-to-noise ratio
More than 90 dB
Dynamic range
More than 88 dB
Tape deck section
(For African model only)
Recording system
4-track 2 channel, stereo
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
North American and Brazilian models:
87.5 MHz – 108.0 MHz (100 kHz step)
Other models:
87.5 MHz – 108.0 MHz (50 kHz step)
Antenna
FM lead antenna
Antenna terminals
75 ohms unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
Pan American and Oceanian models:
530 kHz – 1,710 kHz (with 10 kHz tun-
ing interval)
531 kHz – 1,710 kHz (with 9 kHz tuning
interval)
Other models:
530 kHz – 1,610 kHz (with 10 kHz tun-
ing interval)
531 kHz – 1,602 kHz (with 9 kHz tuning
interval)
Antenna
AM loop antenna, external antenna
terminal
Intermediate frequency
450 kHz
General
Power requirements
Oceanian model: AC 230 V– 240 V,
50/60 Hz
Mexican model: AC 127 V, 60 Hz
Argentina model: AC 220 V, 50/60 Hz
Other models: AC 120 V, 220 Vor
230 V– 240 V, 50/60 Hz,Adjustable
with voltage selector
Power consumption: 460 W
Dimensions (w/h/d) (excl. speakers)
(Approx.)
231 mm × 361 mm × 518 mm
Mass (excl. speakers) (Approx.)
African and Pan Asian models: 16.2 kg
Other models: 15.7 kg
Design and specifications are subject to
change without notice.
• Abbreviation
E4 : African model

HCD-GTR88
2
NOTES ON CHIP COMPONENT REPLACEMENT
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged 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 unsol-
dering.
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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radia-
tion exposure.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safe-
ty check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws, and
all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
TheAC leakage from any exposed metal part to earth ground and from all
exposed metal parts to any exposed metal part having a return to chassis,
must not exceed 0.5 mA (500 microamperes.). Leakage current can be
measured by any one of three methods.
1. Acommercial leakage tester, such as the Simpson 229 or RCA WT-
540A. Follow the manufacturers’ instructions to use these instru-
ments.
2. Abattery-operated AC milliammeter. The Data Precision 245 digital
multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM or
battery-operated AC voltmeter. The “limit” indication is 0.75 V, so
analog meters must have an accurate low-voltage scale. The Simpson
250 and Sanwa SH-63Trd are examples of a passive VOM that is
suitable. Nearly all battery operated digital multimeters that have a 2
VAC range are suitable. (See Fig. A)
1.5 k0.15 FAC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
This appliance is classified as a CLASS 1
LASERproduct. This marking is locatedon
the rearexterior.
TABLE OF CONTENTS
1. SERVICING NOTES
.............................................. 3
2. DISASSEMBLY
2-1. Disassembly Flow........................................................... 5
2-2. Case (Side-L/R) .............................................................. 6
2-3. Top Case.......................................................................... 6
2-4. Tape Mechanism Deck (For African Model only).......... 7
2-5. Front Panel Block, HUB Board, DMB19 Board............ 7
2-6. DC Fan (M101)............................................................... 8
2-7. Back Panel, SUBTRANS Board..................................... 8
2-8. MAIN Board.................................................................. 9
2-9. DC Fan (M101), PT SHIELD Board,
POWER AMP Board Section ......................................... 9
2-10. POWER AMP Board, SUBWOOFER Board................. 10
2-11. Chassis Section ............................................................... 10
2-12. CD Mechanism Block (CDM88BL-DVBU101)............ 11
2-13. Optical Pick-up Block (KHM-313CAB)........................ 11
2-14. Belt (DLM3A) ................................................................ 12
3. TEST MODE ............................................................. 13
4. MECHANICAL ADJUSTMENTS ....................... 15
5. ELECTRICAL ADJUSTMENTS ......................... 16
6. DIAGRAMS
6-1. Block Diagram - RF SERVO, USB Section -................. 17
6-2. Block Diagram - MAIN Section -................................... 18
6-3. Block Diagram - AMP Section -..................................... 19
6-4. Block Diagram - DISPLAY,
POWER SUPPLYSection -............................................ 20
6-5. Printed Wiring Board - DISPLAYBoard -..................... 22
6-6. Schematic Diagram - DISPLAYBoard -........................ 23
6-7. Printed Wiring Board - DMB19 Board - ........................ 24
6-8. Schematic Diagram - DMB19 Board (1/3) - .................. 25
6-9. Schematic Diagram - DMB19 Board (2/3) - .................. 26
6-10. Schematic Diagram - DMB19 Board (3/3) - .................. 27
6-11. Printed Wiring Board - POWERAMP Board - .............. 28
6-12. Schematic Diagram - POWER AMP Board -................. 29
6-13. Printed Wiring Board - MAIN Board -........................... 30
6-14. Schematic Diagram - MAIN Board (1/3) -..................... 31
6-15. Schematic Diagram - MAIN Board (2/3) -..................... 32
6-16. Schematic Diagram - MAIN Board (3/3) -..................... 33
6-17. Printed Wiring Board - MIC, VOL and USB Board - .... 34
6-18. Schematic Diagram - MIC, VOL and USB Boards -...... 35
6-19. Printed Wiring Board - TC Board -................................. 36
6-20. Schematic Diagram - TC Board - ................................... 36
6-21. Printed Wiring Board
- TRANS and SUBTRANS Board - ............................... 37
6-22. Schematic Diagram
- TRANS and SUBTRANS Boards -.............................. 38
6-23. Printed Wiring Board - SUBWOOFER Board -............. 39
6-24. Schematic Diagram - SUBWOOFER Board -................ 40
6-25. Printed Wiring Board - HUB Board -............................. 41
6-26. Schematic Diagram - HUB Board -................................ 42
7. EXPLODED VIEWS
7-1. Case Section.................................................................... 53
7-2. Top Panel Section ........................................................... 54
7-3. Loading Panel Section, HUB Board Section,
DMB19 Board Section.................................................... 55
7-4. DISPLAYBoard Section ............................................... 56
7-5. Front Panel Section......................................................... 57
7-6. Back Panel Section ......................................................... 58
7-7. MAIN Board Section..................................................... 59
7-8. Chassis Section............................................................... 60
7-9. CD Mechanism Section (CDM88BL-DVBU101)......... 61
8. ELECTRICAL PARTS LIST ............................... 62

HCD-GTR88
3
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static break-down 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
fl exible board is easily damaged and should be handled with
care.
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 viscous (sticky, less prone to
fl ow)
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.
NOTE OF REPLACING THE IC102 ON THE DMB19
BOARD
IC102 on the DMB19 board cannot exchange with single. When
this part is damaged, exchange the entire mounted board.
RELEASING THE DISC TRAYLOCK
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Releasing Procedure:
1. Press [ I /
1
STANDBY] button to turn the power on.
2. Press the [CD] button to select CD function.
3. While pressing the [
x
] button, press the [
Z
OPEN/CLOSE]
button for more 5 seconds).
4. The message “UNLOCKED” is displayed and the disc tray is
unlocked.
Note: When “LOCKED”is displayed, the slot lock is not released by
turning power on/off with the [
I /
1
STANDBY] button.
MODEL IDENTIFICATION
– Back Panel –
• Abbreviation
AR : Argentina model
AUS : Australian model
E2 : 120V AC area in E model
E4 : African model
E51 : Chilean and Peruvian models
MX : Mexican model
Model Part No.
HCD-GTR88: E2, E51 4-164-385-0[]
HCD-GTR88: AR 4-164-385-1[]
HCD-GTR88: MX 4-164-385-2[]
HCD-GTR88: E4 4-164-385-4[]
HCD-GTR88: AUS 4-164-385-5[]
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc re
fl ective surface by the objective lens in the optical
pickup block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
PART No.

HCD-GTR88
4
HOW TO DISTINGUISH TAPE MECHANISM DECK
Two kinds of tape mechanism decks installed by this set exist.
Please do the repair exchange after con
fi rming which tape mechanism deck set of the repair according to how to distinguish the fi gure below.
Tape Deck Name Tape Deck Part No. Belt Part No.
CS-21SC-900TP 1-797-575-112-688-621-01 BELT(R/F)
2-688-622-01 BELT(MAIN)
motor
Mold part: CS-21SC-900TP
tape deck
HOW TO OPEN THE TRAYWHEN POWER SWITCH TURN OFF
Step: 1) Work after removing the case (side-R and side-L) referring to “2.2. CASE (SIDE-L/R)” on disassembly (page 6).
2) Work after removing the top case referring to “2-3. TOP CASE” on disassembly (page 6).
lever
state of opening the CD tray
gear
dTurn a gear by
a driver till a lever
rises up to the
position of the figure.
(Try to push gear at the
same time slowly pull
Front panel away.)
a
c
c
b
e

HCD-GTR88
5
SECTION 2
DISASSEMBLY
• This set can be disassembled in the order shown below.
2-1. DISASSEMBLYFLOW
Note: Follow the disassembly procedure in the numerical order given.
2-6. DC FAN (M101)
(Page 8)
2-2. CASE (SIDE-L/R)
(Page 6)
2-3. TOP CASE
(Page 6)
2-5. FRONT PANEL BLOCK, HUB BOARD, DMB19 BOARD
(Page 7)
2-7. BACK PANEL, SUBTRANS BOARD
(Page 8)
2-8. MAIN BOARD
(Page 9) 2-11. CHASSIS SECTION (Page 10)
2-9. DC FAN (M101), PT SHIELD BOARD,
POWER AMP BOARD SECTION
(Page 9)
2-10. POWER AMP BOARD,
SUBWOOFER BOARD
(Page 10)
2-12. CD MECHANISM BLOCK (CDM88BL-DVBU101)
(Page 11)
2-13. OPTICAL PICK-UP BLOCK (KHM-313CAB)
(Page 11)
SET
2-4. TAPE MECHANISM DECK (FOR AFRICAN MODEL ONLY)
(Page 7)
2-14. BELT (DLM3A)
(Page 12)

HCD-GTR88
6
2-2. CASE (SIDE-L/R)
2-3. TOP CASE
2three screws
(BVTP3 u10)
4case (side-R) 1four screws
(case 3 TP2)
3
2three screws
(BVTP3 u10)
Tape deck section
(For African model only)
4case (side-L)
1four screws
(case 3 TP2)
3
Tape deck section
(For African model only)
1one screw
(BVTP3 u10)
3two claws
2wire (flat type) (9 core)
(CN450)
4Lift up the back
side of top case.
5 top case

HCD-GTR88
7
2-4. TAPE MECHANISM DECK (FORAFRICAN MODEL ONLY)
2-5. FRONT PANEL BLOCK, HUB BOARD, DMB19 BOARD
6bracket (deck)
5two screws
(BVTP2.6 u8)
7two screws
(BVTP2.6 u8)
9tape mechanism deck
1CN501 (8P)
3two screws
(BVTP3 u8)
2Cut the clamp.
8Open the cassette box.
4TC board
top panel block
qd wire (flat type) (13 core)
(CN410)
lever
1Turn a gear by
a driver till a lever
rises up to the
position of the figure.
state of opening the CD tray
gear
4wire (flat type) (23 core)
(CN405)
8one screw
(BVTP3 u10)
q; front panel block
3panel loading
9five screws
(BVTP3 × 8)
8one screw
(BVTP3 × 10)
7CN1501 (10P)
6CN470 (7P)
5wire (flat type) (11 core)
(CN403)
qk DMB19 board: CN1105 (4P)/
HUB board: CN1500 (4P)
qg two screws
(BVTP3 u8)
qa CD block
qj HUB
board wd two screws
(BVTP3 u10)
wg four screws
(BVTP3 u8)
wf wire (flat type) (9 core)
(CN1106)
wh DMB19 board
ql bracket
(ground hub)
qh CN201 (6P)
w; CN650 (8P)
qs wire (flat type) (24 core)
(CN101)
wa CN601 (9P)
ws wire (flat type) (7 core)
(CN4602)
qf saranet cushion
2Pull the tray by hand.

HCD-GTR88
8
2-6. DC FAN (M101)
2-7. BACK PANEL, SUBTRANS BOARD
2cover fan (GVX7S)
1four screws
(BVTP3 u8)
3two screws
(BVTP3 u8)
4DC fan (M101)
5CN600 (3P)
1wire (flat type) (9 core)
(CN220)
qj binding band (taiton)
2CN1200 (3P)
4CN691 (4P)
3CN1201 (4P)
qk clamp filter
(ferrite core)
qf Bracket (Subtrans)
qd SUBTRANS board
wa back panel
qh tuner (FM/AM)
qg two screws
(BVTT3 u6)
5one screw
(BVTP3 u8)
qs two screws
(BVTP3 u8)
6one screw
(BVTP3 u8)
7two screws
(BVTP3 u8)
w; power cord
8one screw
(BVTP3 u8)
9one screw
(BVTP3 u8)
q; one screw
(BVTP3 u8)
ql cord bush
qa

HCD-GTR88
9
2-8. MAIN BOARD
2-9. DC FAN (M101), PT SHIELD BOARD, POWER AMP BOARD SECTION
4CN550 (6P)
5MAIN board
3CN200 (12P)
1three screws
(BVTP3
u8)
2CN100 (10P)
1one screw
(BVTP3 u8)
6POWER AMP board section
5CN1302 (3P)
q; DC Fan (M101)
8DC Fan bracket
2PT SHIELD board
3three screws
(BVTP3 u8)
9two screws
(BVTP3 u8)
7two screws
(BVTP3 u8)
qa one screw
(BVTP3 u8)
4CN1250 (13P)
qs clamp

HCD-GTR88
10
2-10. POWERAMP BOARD, SUBWOOFER BOARD
2-11. CHASSIS SECTION
1one screw
(BVTP3 u8)
6two screws
(BVTP3 u8)
7Bracket (PWB)
5POWER AMP board
8heat sink
q; SUBWOOFER board
2one screw
(BVTP3 u8)
3two screws
(transistor)
9two screws
(transistor)
4CN803 (7P)
1two screws
(BVTP3 u8)
1two screws
(BVTP3 u8)
3chassis block
2

HCD-GTR88
11
2-12. CD MECHANISM BLOCK (CDM88BL-DVBU101)
2-13. OPTICAL PICK-UP BLOCK (KHM-313CAB)
qa sheets (CDM)
8one screw
(BVTP3 u8)
6cover dust (CDM88-A-BTM)
5cover (shutter)
1wire (flat type) (13 core)
(MOTOR board)
7three sheets (CDM)
q; CD mechanism block
(CDM88BL-DVBU101)
8one screw
(BVTP3 u8)
9cover dust (CDM88-A-top)
2one screw
(BVTP3 u8)
3bracket
(MTK)
4
CD mechanism block
(CDM88BL-DVBU101)
4two insulator screws
5two insulators
4two insulator screws
5two insulators 7optical pick-up block
(KHM-313CAB)
3connector
6holder BU
1four screws
(BVTP2.6)
2wire (flat type) (24 core)

HCD-GTR88
12
2-14. BELT (DLM3A)
2four screws
3cover
4two belts (DLM3A)
belt
belt
position of belt
gear
lever
1Turn a gear till a lever
rises up to the position
of the figure.
state of opening the CD tray

HCD-GTR88
13
SECTION 3
TEST MODE
PANEL TEST MODE
This mode is used to check the fl uorescent indicator tube, LEDs,
keys, [MASTER VOLUME] jog, [OPERATION DIAL] jog, mod-
el, destination and software version.
Procedure:
1. Press [
x
], button, [METER MODE] button and [DISC SKIP/
EX-CHANGE] button simultaneously.
2. All LEDs and segments in
fl uorescent indicator tube are light-
ed up.
3. When you want to enter to the software version display mode,
press [DISC 1] button. The model information appears on the
fl uorescent indicator tube.
• “GVX 7S” is shown for MHC-GTR88.
Press [DISC 1] button again to view the destination
information.
4. During the destination information display, press [DISC 1]
button. Each time [DISC 1] button is pressed, the
fl uorescent
indicator tube shows the version of each category software in
the following sequence: SC, MTK (DMB Board
fi rmware ver-
sion), GC, SYS, CD, CDMA, CDMB, ST, TC TA, TM, MTR
(METER) and return back to model information display.
5. When [DISC 3] button is pressed while the version numbers
are being displayed except model and destination, the date
of the software creation appears. When [DISC 3] button is
pressed again, the display returns to the software version dis-
play. When [DISC 1] button is pressed while the date of the
software creation is being displayed, the date of the software
creation is displayed in the same order of software version dis-
play.
6. Press [DISC 2] button, the key check mode is activated.
7. In the key check mode, the
fl uorescent indicator tube displays
“K0 V0”.
Each time a button is pressed, “K” value increases. However,
once a button has been pressed, it is no longer taken into ac-
count.
“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.
8. When [DISC SKIP/EX-CHANGE] button is pressed after all
LEDs and segments in
fl uorescent indicator tube light up, al-
ternate segments in
fl uorescent indicator tube and LEDs would
light up. If you press [DISC SKIP/EX-CHANGE] button
again, another half of alternate segments in
fl uorescent indi-
cator tube and LEDs would light up. Pressing [DISC SKIP/
EX-CHANGE] button again would cause all segments in
fl uo-
rescent indicator tube and LEDs light up.
9. To release from this mode, press three buttons in the same
manner as step 1, or disconnect the power cord.
COMMON TEST MODE
This mode is used to check operations of the Ampli fi er section.
To enter Common Test Mode
Procedure:
1. Press [
x
], button, [METER MODE] button and [OPEN/
CLOSE] button simultaneously.
2. The CD ring indicators
fl ash on the fl uorescent indicator tube.
The function is changed to AUDIO and the volume is changed
to VOLUME MIN.
Check of Ampli fi er
Procedure:
1. Press [EQ BAND/SURROUND] button repeatedly until a
message “GEQ MAX” appears on the
fl uorescent indicator
tube. GEQ increases to its maximum.
2. Press [EQ BAND/SURROUND] button repeatedly until a
message “GEQ MIN” appears on the
fl uorescent indicator
tube. GEQ decreases to its minimum.
3. Press [EQ BAND/SURROUND] button repeatedly until a
message “GEQ FLAT” appears on the
fl uorescent indicator
tube. GEQ is set to
fl at.
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
fl uorescent indi-
cator tube.
5. When the [MASTER VOLUME] knob is turned counterclock-
wise even slightly, the sound volume decreases to its minimum
and a message “VOLUME MIN” appears on the
fl uorescent
indicator tube.
To release from Common Test mode
1. To release from this mode, press [
?/1
STANDBY] 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
EEPROM to initial conditions. Execute this mode when returning
the set to the customer.
Procedure:
1. Press [
?/1
STANDBY] button to turn on the system.
2. Press [
x
] button, [ENTER] button, and [
?/1
STANDBY] but-
ton simultaneously.
3. “COLD RESET” appears on the
fl uorescent indicator tube.
After that, the
fl uorescent indicator tube becomes blank for a
while, and the system is reset.
VACS ON/OFF
This mode is used to switch ON and OFF the VACS (Variable At-
tenuation Control System).
Procedure:
1. Press [
?/1
STANDBY] to turn on the system.
2. Press [
x
] button, [RETURN], and [DISPLAY] button simul-
taneously. The message “VACS OFF” or “VACS ON” appears
on the
fl uorescent indicator tube.
TUNER STEP CHANGE
The step interval of AM channels can be toggled between 9 kHz
and 10 kHz.
Procedure:
1. Press [
?/1
STANDBY] button to turn on the system.
2. Press [TUNER/BAND] button repeatedly to select the “AM”.
3. Press [
?/1
STANDBY] button to turn off the system.
4. Press [ENTER] button and [
?/1
STANDBY] button simulta-
neously. The system turns on automatically. The message “AM
9K STEP” or “AM 10K STEP” appears on the
fl uorescent in-
dicator tube and thus the channel step is changed.
CD SHIP MODE (WITH MEMORYCLEAR)
This mode moves the optical pick-up to the position durable to
vibration and clears all data including preset data stored in the EE-
PROM to initial conditions during the next AC-In. Use this mode
when returning the set to the customer after repair.
Procedure:
1. Press [
?/1
STANDBY] button to turn on the system.
2. Select CD function.
3. Press [
x ] button, [OPEN/CLOSE] button and [
?/1
STAND-
BY] button simultaneously. The system turns off automati-
cally.
4. After the “STANDBY” blinking display fi nishes, a message
“MECHA LOCK” is displayed on the
fl uorescent indicator tube
and the CD ship mode is set.

HCD-GTR88
14
CD SHIP MODE (WITHOUT MEMORYCLEAR)
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:
1. Press [
?/1
STANDBY] button to turn on the system.
2. Select CD function.
3. Press [DISC SKIP/EX-CHANGE] button and [
?/1
STAND-
BY] button simultaneously. The system turns off automati-
cally.
4. After the “STANDBY” blinking display
fi nishes, a message
“MECHA LOCK” is displayed on the fl uorescent indicator
tube and the CD ship mode is set.
CD TRAYLOCK MODE
This mode let you lock the disc tray. When this mode is activat-
ed, the disc tray will not open when [
Z OPEN/CLOSE] button
or [DISC SKIP/EX-CHANGE] button is pressed. The message
“LOCKED” will be displayed on the
fl uorescent indicator tube.
This mode only applied when there is disc(s) on the tray.
Procedure:
1. Press [
?/1
STANDBY] button to turn on the system.
2. Select CD function.
3. Press [
x ] button and [ Z OPEN/CLOSE] button simultane-
ously and hold down until “LOCKED” or “UNLOCKED” dis-
played on the
fl uorescent indicator tube (around 5 seconds).
FACTORYPRESET
This mode is use to load all the factory use preset frequencies
into FM 1-FM 20 and AM 1-AM 10. Originally, frequency of FM
1-FM 20 and AM 1-AM10 are set to the minimum frequency.
Procedure:
1. Press [
?/1
STANDBY] button to turn on the system.
2. Press [EQ BAND/SURROUND], [ x ] button, and [DISC 1]
button simultaneously and the message “FACTORY” appears
on the
fl uorescent indicator tube. The function is changed to
TUNER automatically.
VACS DISPLAY
This mode is used to check the VACS level.
Procedure:
1. Press [
?/1
STANDBY] button to turn on the system.
2. Press [ERASE], [
x ] button and [ENTER] button simultane-
ously.
3. The
fl uorescent indicator tube displays “V0AP0”.
“V” represents Conventional VACS (Triggered by signal level)
“AP” represents AP VACS (Abuse Protection Variable Attenu-
ation Control System)
• To release from VACS display mode
To release from this mode, do the step (2) again.
METER SWITCH TOUCH COUNT DISPLAY
This mode is used to display the total count of meter pointer touch
initial switch and max switch.
Procedure:
1. Press [
?/1
STANDBY] button to turn on the system.
2. Press [ x ] button, [ENTER] button and [DISPLAY] button si-
multaneously.
3. The
fl uorescent indicator tube displays “IxxxxxMyyyyy”.
“I” represents the Initial Switch touch.
“xxxxx” represents the total count of Initial Switch touch.
(Maximum Value of “xxxxx” = 65535)
“M” represents the Max Switch touch.
“yyyyy” represents the total count of Max Switch touch.
(Maximum Value of “yyyyy” = 65535)
• To release from Meter Switch Touch Count Display Mode.
To release from this mode, do the step (2) again.
The
fl uorescent indicator tube displays “MODE OUT”.
METER TEST MODE
This mode is used to check the meter device.
Procedure:
1. Press [
?/1
STANDBY] button to turn on the system.
2. Press [ x ] button, [ENTER] button and [METER MODE] but-
ton simultaneously.
3. Meter Backlight LEDs, Meter Pointer LEDs, Power Illumina-
tor LEDs and
fl uorescent indicator tube are lighted up.
4. When you want to perform count total step from Initial Switch
to Max Switch operation mode, press [
M/>/ TUNING +]
button. The meter pointer will move from Initial Switch to
Max Switch and
fi nally move back to the middle position. The
total step count information appears on the
fl uorescent indica-
tor tube. “xxx STP yy” is shown.
“xxx” represents the total step.
(Value of “xxx” should between 430 steps to 470 steps)
“yy” represents the status of total step count.
(If total step between 430 steps to 470 steps, “yy” is OK, Else
“yy” is NG)
5. When you want to perform count total step from Max Switch
to Initial Switch operation mode, press [
m/./ TUNING –]
button. The meter pointer will move from Max Switch to Ini-
tial Switch and
fi nally move back to the middle position. The
total step count information appears on the
fl uorescent indica-
tor tube. “xxx STP yy” is shown.
“xxx” represents the total step.
(Value of “xxx” should between 430 steps to 470 steps)
“yy” represents the status of total step count.
(If total step between 430 steps to 470 steps, “yy” is OK, else
“yy” is NG)
• To release from Meter Test Mode.
To release from this mode, do the step (2) again.
The fl uorescent indicator tube displays “TST MODE OUT”.
CDM AGING MODE
This mode is used to display the total count of all disc playing.
Procedure:
1. Press [
?/1
STANDBY] button to turn on the system.
2. Select CD function and All DISC play mode.
3. Put discs on all trays and close the tray.
4. Press [GROOVE] button, [
x ] button and [RETURN] button
simultaneously.
5. The
fl uorescent indicator tube displays Aging Display “AG
xxxx/yyyy”.
“xxxx” represents the error counter
(Maximum Value of “xxxx” = 9999)
“yyyyy” represents the cycle counter
(Maximum Value of “yyyy” = 9999)
6. Press [
m/./ TUNING –] or [ M/>/ TUNING +] to
search for Aging History Error Display
The
fl uorescent indicator tube displays “Mx E1E2E3E4”.
x: error history number
E1: Loading sequence JCP high
E2: Loading sequence JCP low
E3: Loading operation JCP
E4: Cam position operation JCP
7. Press [RETURN] to Aging Display
• To release from CDM Aging Mode.
To release from this mode, press [
?/1
STANDBY] button or
perform COLD RESET operation.

HCD-GTR88
15
SECTION 4
MECHANICAL ADJUSTMENTS
(For African model only)
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head pinch roller
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head demag-
netizer. (Do not bring the head magnetizer close to the erase
head.)
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
Mode Torque Meter Meter Reading
FWD CQ-102AS 2.0 – 8.0 mN • m (20 to 80 g • cm)
(0.28 – 1.12 oz • inch)
FWD Back Tension CQ-102C 0.15 – 0.6 mN • m (1.5 to 6 g • cm)
(0.021 – 0.083 oz • inch)
FF CQ-201AS 5 – 17.7 mN • m (50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
REV CQ-201B 5 – 17.7 mN • m (50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
• Tape Tension Measurement
Mode Torque Meter Meter Reading
FWD CQ-403A more than 80 g
(more than 2.82 oz)

HCD-GTR88
16
SECTION 5
ELECTRICAL ADJUSTMENTS
FM TUNE LEVEL CHECK
Procedure:
1. Turn the power on.
2. Input the following signal from signal generator to FM antenna
input directly.
* Carrier frequency : A= 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note: Use 75 ohm coaxial cable to connect signal generator and the set.
You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Con
fi rm “TUNED” is lit on the display for A, B and C signals.
When mark of “TUNED” means “The selected station signal is
received in good condition.”
(For African model only)
1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
TEST TAPE
Tape Signal Used for
P-4-A063 6.3 kHz, -10 dB Azimuth Adjustment
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Mode: Playback
set
MIC board
PHONES jack
(J702)
+
–
level meter
test tape
P-4-A063
(6.3 kHz, 10 dB)
TUNER SECTION
FM signal generator
OUT (75 Ω)
SET
DECK SECTION 0dB = 0.775V
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.
Screw
position
L-CH
peak
within
1 dB
Output
level
L-CH
peak R-CH
peak
within
1 dB
Screw
position
R-CH
peak
3. Mode: Playback
set
test tape
P-4-A063
(6.3 kHz, 10 dB) oscilloscope
VH
waveform of oscilloscope
in phase 45q90q135q180q
good wrong
MIC board
PHONES jack
(J702)
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Record/Playback/Erase Head

HCD-GTR88
HCD-GTR88
1717
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM - RF SERVO, USB Section -
REC/PLAYB
OPTICAL PICK-UP
BLOCK
(KHM-313CAB)
RF AMP, SERVO DSP,
AUDIO PROCESSOR
IC101
SYSTEM
CONTROLLER
IC401 (1/4)
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC201
AUTOMATIC POWER
CONTROL
Q102-1
RF_IP
125
RF_C
3RF_B 2RF_A 1RF_D 4
RF
VOA/A
VOB/B
VOC/C VOD/D RF_F6VOE/E+G RF_E5VOF/F+H
V2O12VC LDO117LD (780)
AUTOMATIC POWER
CONTROL
Q102-2 LDO2
18LD (650)
FOO25
CD ON
SWITCH
Q101-1
CD ON
SWITCH
Q101-2
VR (780)
MSW GPIO
23
118
VR (650)
FCS+
MSW
MDI115 MDI216
PD
LIMIT SW
Q103
SF_CS#CS_
SD-RAM
IC104
X101
27MHz
36
FCS– 37 1
TRO24
TRK+ 35
TRK– 34 4
FMO21
SL+ 29
SL– 30 10
DMO20
SP+ 27
SP– 28
31 32 41 46 47
13
SPFG/OPINN128
45
GPIO GPIO GPIO
120
DG0, DQ1 – DQ15
RD0 – RD15
A0 – A11
RA0 – RA11
2, 4, 5, 7, 8, 10, 11, 13, 42,
44, 45, 47, 48, 50, 51, 53
45 – 49, 51 – 53,
64 – 61, 56 – 59 82, 83, 85, 86,
74 – 69, 81, 67
23 – 26,
29 – 34, 22, 35
36
XTALI
9
1
SF_CKSCK
39
6
BA0 BA0
78 20
BA1 BA1
80 21
RCLK CLK
66 38
DQM0 LDQM
55 15
DQM1 UDQM
65 39
RAS# RAS
77 18
CAS# CAS
76 17
RWE# WE
75 16
: CD PLAY : AUDIO : USB
FOCUS
COIL DRIVE
TRACKING
COIL DRIVE
SLED
MOTOR DRIVE
SPINDLE
MOTOR DRIVE
REGULATOR
GPIOMUTE123 11619
6 7
MUTE4MUTE4 22
20 GPIOTSD-M 94 22
IOPMON/ OPINP
127
40
8
PS 21
BUFFER BUFFER
RF +3.3V
REGO2
REGO1
REGO2
REGO1
FLASH ROM
IC102
XTALO
10
L-OUT
115 119
GPIO
114
GPIO19 106 VINL
14 13
VINR
BCK 7
LRCK 6
8
SCKI
A/D CONVERTER
IC4601
9DOUT R-CH USB CONTROLLER
IC1501
31 USBUP_DP
30 USBUP_DM
AOUT-L
5 8
AOUT-R
D/A CONVERTER
IC4602
1SDATA 2SCLK 3LRCK 4ACLK
USB_DP 27
R-CH
USB_DM 28
SO
2
SI
5
SF_DO
37
SF_DI
38
PRST# 43
CD MECHANISM
DECK
M1- M2+ M2- M1+
M1+ 23
M1- 25
M2+ 24
M2- 26
MOTOR
DRIVE
Q645 - 648
MOTOR
DRIVE
Q640, 641,
Q643, 644
SW3 SW2 SW7-CHACK SW1
SW1 21
SW3 22
SW2 18
SW-CHUCK 19 SW5-STOCK
SW8-OPEN SW6-CLOSE
SW-STOCK 6
SW-CLOSE 7
SW-OPEN 5
2USBDN1_DP 1USBDN1_DM
50MTK-OC2
CN1001
3 2 1
D+
D–
47MTK-OC1
VBUS
VBUS OVER
CURRENT DETECT
IC1500
4USBDN2_DP 3USBDN2_DM
3 2 1
D+
D–
VBUS
MTK-RST38
MTK-TXD
35 MTK-RXD 36 MTK-CLOCK 37
MTK-XIFCS
34 MTK-BUSY 39
IFSDI 35
IFSOD 41
IFSCK 40
IFCS# 88
IFBSY 87
HUB_RST45 VBUS_DET
44
VBUS_DET
27 RESET_N 26
X1500
24MHz
XTAL1/ CLKIN
33 XTAL2
32
USB +5V
PLAYA
CN1000
SIGNAL PATH R-CH is omitted due to same as L-CH.
OPOUT126
1 7
3
5
A
(Page 18)
B
(Page 18)
USB RECORD PREAMP
7 5
IC251

HCD-GTR88 HCD-GTR88
1818
6-2. BLOCK DIAGRAM - MAIN Section -
R-CH
TUNER (FM/AM)
AM
FM ANT AM ANT
ST-L
ST-R
ST-DOUT
R-CH
R-CH
(E4)
R-CH
ST-DIN
ST-CLK
ST-CE
FM 75
:
COAXIAL
ANTENNA
TUNED 54 ST-TUNED
43 ST-L 56 ST-R 42 TAPE L
1TAPE R
R-CH 3CD-R
36 REC BL
7REC BR
21
DATA
22
CLK
44
30
PC-L
46 MIC
29 VOLINLTONEOUTL 26
(SW OUTL)
R-CH 55 PC-R
40 CD-L
46 ST-DOUT 51 ST-CLK 53 ST-CE
R2A15216FP-DATA
58
TC REC MUTE
41
TC STATE
72
9
SA2
POWER ILLUMINATOR
69
VACS IN
70
R2A15216FP-CLK
57
HP/MIC DET
66
25 20
AGC OUTL
(SW OUTR)
AGC OUTR
OUTL
6
RECAR
28BB1L 37RECAL
BAND-PASS
FILTER
Q210
27 19 17 18
BB2L
BB2R BB1R
OUTR
BASS AGC
Q128
BASS AGC
Q178
D104
D201 D116
INPUT SELECTOR,
ELECTRICAL VOLUME
IC400
SYSTEM CONTROLLER
IC401 (2/4)
: AUDIO
SIGNAL PATH
R-CH is omitted due to same as L-CH.
: TUNER (FM/AM)
J700
MIC
RV700
MIC LEVEL
IC700 MIC AMP
52 ST-DIN
PC_R
PC_L
J020
PC IN
L-OUT
REC-L
HP DET
OUT
SW OUT
BASS AGC
: MIC : TAPE (PLAY)
: TAPE (REC)
R-CH R-CH R-CH
1375
R-CH
Q063
57
R-CH
L501
S501
IC502
IC501
OPAMP
OPAMP
MUTE
SW Q062
MUTE
SW
BIAS OSC
Q501, 502
R-CH
EH
VREF
SW
L-CH
TAPE DECK
A
(Page 17)
13X-OUT 15X-IN X402
8MHz
11XC-OUT
10XC-IN X401
32.768kHz
Abbreviation
E4 : African model
C
(Page 19)
B
(Page 17)
D
(Page 19)
E
(Page 19)
F
(Page 19)
G
(Page 20)
75

HCD-GTR88
HCD-GTR88
1919
6-3. BLOCK DIAGRAM - AMP Section -
R
L
SW PREAMP
IC255
75
SW PREAMP
IC254
75
SW PREAMP
IC253
75
FR PREAMP
IC252
POWER
AMP
IC1300
IC800
AMP
POWER
MUTING
Q270
OVER LOAD
DETECT
Q1301
OVER LOAD
DETECT
Q1300
OVER LOAD
DETECT
Q850
OVER LOAD
DETECT
Q800
R-CH
MUTING
Q245
MUTING
CONTROL
Q290
MUTE
Q1309, Q1308
LINE MUTE
63
STK MUTE
PROTECT
CONTROL
FAN HIGH SPEED
60
16
15
11
6 4
18 11
SW SPK RELAY
48
FAN MOTOR
DRIVE
Q602
RY1300
+
– –
+
RY862
D1036
TH1301
MM101
(DC FAN)
MM101
(DC FAN)
PHONES
SUBWOOFER
RELAY
DRIVE
Q031
FR SPK RELAY
43
RELAY
DRIVER
Q032
FAN SW
Q600
R-CH J702
SYSTEM CONTROLLER
IC401 (3/4)
: AUDIO
SIGNAL PATH
R-CH is omitted due to same as L-CH.
DC
DETECT
Q1302, Q1303
THERMAL
DETECTOR
Q1305, Q1307
R
LFRONT
SPEAKER
TB1300
+
– –
+R
LSATELLITE
SPEAKER
TB1301
59
BASS AGC HP DET OUT
SW OUT
RELAY
DRIVER
Q030
MUTING
Q220
14 8
C
(Page 18)
F
(Page 18)
D
(Page 18)
E
(Page 18) +
–
+
–
TB801
H
61
13
MUTING
Q295
PROTECT
DETECT
Q1304, 1306
(Page 20)
R-CH
R-CH
R-CH
R-CH
R-CH
RELAY
DRIVER
Q033

HCD-GTR88 HCD-GTR88
2020
6-4. BLOCK DIAGRAM - DISPLAY, POWER SUPPLYSection -
54
REMOTE CONTROL
RECEIVER
IC1100
FL1100
FLUORESCENT
INDICATOR
TUBE
94 SW/USB CTRL
FLUORESCENT INDICATOR
TUBE DRIVER
IC1101 SYSTEM CONTROLLER
IC401 (4/4)
RECT
D1201, 1202
LED-VOL1. 2 LED-VOL3. 4 LED-VOL5. 6
S1100 – 1109,
S1110 – 1119,
S1124 – 1133,
S1302
75STBY RELAY
RESET SWITCH
Q350, 351
D351
D571
D+3.3V
+1.8V
71OVERVOLTAGE 20AC CUT 12RESET
87 MASTER VOL
SG5/KS5 – SG24/KS24
14 – 33
D1105 – 1107, SELA
D1108 – 1110, SEL B
(STREAM)
LED DRIVE
Q1122
86 USB-LED CTRL
LED DRIVE
Q1121
D1104
SUBWOOFER
95 STBY LED
AD KEY0
4SIRCS
D1011
I/
1
STANDBY
ROTARY
ENCODER
MASTER
VOLUME
S1301
DIN FL-DRIVER-DATA2 2
CLK FL-DRIVER-CLK1 1 STB FL-DRIVER-CS3 100
88 91 90 74 97 89 85
POWER/DISPLAY-KEY
AD-KEY0 AD-KEY1 AD-KEY2
(AC IN)
RY1200
RELAY
DRIVE
Q1200
VOLTAGE
SELECTOR
S1200
FAN
+12V
D1250
M+9V
F1254
RECT
D600
F1252 F1253 F1250 F1251
RECT
D1300
LED+9V
+4V
REGULATOR
Q352-354
LED SELA,
LED SEL B
CD MOTOR B+ REGULATOR
Q655 – 658
27
2 1
CDM-SD
JOG B+
3AD SUPPLYSW
B+ SWITCH
Q400, 500
–32V
REGULATOR
Q1250
AMP
SECTION
B+
FOR
FLUORESCENT
INDICATOR
TUBE –VG
VF VF
PT1200
SUB POWER
TRANSFORMER
PT1250
MAIN POWER
TRANSFORMER
VCC +3.3V
EVER +3.3V
+VH
–VH
D1002, 1003
(E2, E51, E4) (MX, AR, AUS)
AC DETECT
GR1 – GR14
34 – 47
LED DRIVE
Q1118 – 1120
USB B
D1000
USB A
+5V
REGULATOR
IC065
49MTK OE
USB +5V
M +5V +5V
REGULATOR
Q360
B+ SWITCH
Q300 – 303
82 METER PTR
LED
METER
DISPLAY
BLOCK
AC CUT
DETECTOR
D1203
83 METER BL CTL
LED DRIVE
Q230
LED SELA
LED SEL B
LED
LED DRIVE
Q582
81 METER SW 77 METER-IN4 78 METER-IN3 80 METER-IN2
METER-IN179
+9V
SWITCH
Q684
M+9V
(E4)
RECT
D1301
+VL
–VL
POWER
CONTROL
Q090
SW DRIVER
Q681
76TC_M+9V SW
+12V
REGULATOR
IC040
M+9V
UNREGULATE
H
Abbreviation
AR : Argentina model
E2 : 120V AC area in E model
E4 : African model
E51 : Chilean and Peruvian models
MX : Mexican model
AUS : Australian model
12
D623, 624
A+9V
AVDD +5V
DVDD +5V
RF+3.3V
+5V
REGULATOR
Q696
21
3.3V
REGULATOR
IC107
F1255
(Page 19)
G
(Page 18)
+9V
REGULATOR
IC055
I
O
+3.3V
REGULATOR
IC075
+9V
REGULATOR
IC200
21
+1.8V
REGULATOR
IC111 81