Sony HCD-GTR6 User manual

1
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
Ver. 1.0 2009. 05
SERVICE MANUAL
E Model
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
Australian Model
HCD-GTR6B/GTR8B
AUDIO POWER SPECIFICATION
Amplifier section
MHC-GTR8 (HCD-GTR8/HCD-GTR8B)
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): 210 W + 210 W (at 6 Ω, 1 kHz, 1% THD,
at LINK MODE)
Front speaker
RMS output power (reference):
280 W + 280 W (per channel at 8 Ω,
1 kHz, 10% THD)
Surround speaker
RMS output power (reference):
110 W + 110 W (per channel at 24 Ω,
1 kHz, 10% THD)
Subwoofer
RMS output power (reference):
160 W + 160 W (per channel at 6 Ω,
100 Hz, 10% THD)
SPECIFICATIONS
MHC-GTR7 (HCD-GTR7)
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): 215 W + 215 W (at 6 Ω, 1 kHz, 1% THD, at LINK MODE)
Front speaker
RMS output power (reference):
285 W + 285 W (per channel at 8 Ω, 1 kHz, 10% THD)
Surround speaker
RMS output power (reference): 110 W + 110 W (per channel at 24 Ω,
1 kHz, 10% THD)
Subwoofer
RMS output power (reference): 210 W (at 8 Ω, 100 Hz, 10% THD)
Sony Corporation
Audio & Video Business Group
Published by Sony EMCS (Malaysia) PG Tec
9-890-515-01
2009E08-1
© 2009. 05
– Continued on next page –
COMPACT DISC DECK RECEIVER
• HCD-GTR6/GTR7/GTR8
are the tuner, CD and
amplifier section in
MHC-GTR6/GTR7/GTR8
• HCD-GTR6B/GTR8B
are the tuner, deck, CD and
amplifier section in
MHC-GTR6/GTR7/GTR8 Photo : HCD-GTR8B (E Model)
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
CD
Section
Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM74HF-DVBU101//M
Optical Pick-up Name KHM-313CAB/C2NP
Tape Deck Section
only for HCD-GTR6B/GTR8B
Model Name Using Similar Mechanism HCD-GTX777/GTX787/GTX888
Tape Mechanism Type CFP42608

2
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. RE-
PLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
MHC-GTR6 (HCD-GTR6/HCD-GTR6B)
The following are measured at
AC 120, 220, 240 V, 50/60 Hz
Front/Surround speaker
Power Output (rated): 200 W + 200 W (at 4 Ω, 1 kHz, 1% THD, at LINK MODE)
Front speaker
RMS output power (reference):
225 W + 225 W (per channel at 8 Ω, 1 kHz, 10% THD)
Surround speaker
RMS output power (reference):
225 W + 225 W (per channel at 8 Ω, 1 kHz, 10% THD)
Inputs
VIDEO (AUDIO IN) L/R:
Voltage 250 mV, impedance 47 kilohms
PC 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 Ωor more
Disc player section
System Compact disc and digital audio system
Laser Diode Properties Emission Duration: Continuous
Laser Output*: Less than 44.6 µW
* 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
(Except for Latin American and Mexican models)
Recording system 4-track 2-channel stereo
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
North American models:
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 ohms unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range Pan-American and Oceanian models:
530 – 1,710 kHz (with the interval set at 10 kHz)
531 – 1,710 kHz (with the interval set at 9 kHz)
Other models: 530 – 1,610 kHz (with the interval set at 10 kHz)
531 – 1,602 kHz (with the interval set at 9 kHz)
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
WMA: 48 – 192 kbps AAC: 48 – 320 kbps
Sampling frequencies MP3 (MPEG 1 Audio Layer 3): 32/44.1/48 kHz
WMA: 44.1 kHz
AAC: 44.1 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
Australian 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 MHC-GTR8: 460 W
MHC-GTR7: 440 W
MHC-GTR6: 300 W
Dimensions (w/h/d) (Approx.)
HCD-GTR8/HCD-GTR8B/
HCD-GTR7/
HCD-GTR6/HCD-GTR6B: 295x380x457mm
Mass (Approx.) HCD-GTR8B: 16.5 kg
HCD-GTR8/HCD-GTR7: 15.8 kg
HCD-GTR6B: 14.5 kg
HCD-GTR6: 13.8 kg
Design and specifications are subject to change without notice.
• Standby power consumption: 0.5 W
• Halogenated flame retardants are not
used in the certain printed wiring boards.

3
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
NOTES ON HANDLINGTHE 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-GTR6/GTR6B/GTR7/GTR8/GTR8B
MODEL IDENTIFICATION
– MODEL NUMBER LABEL –
• Abbreviation
E2 : 120V AC area in E model
E3 : 240V AC area in E model
E51 : Chilean and Peruvian model
AR : Argentina model
AUS : Australian model
MX : Mexican model
MODEL Parts No
GTR8B: E3 4-126-681-0s
GTR8: E2/E51 4-126-681-1s
GTR8: AR 4-126-681-3s
GTR8B: AUS 4-126-681-5s
GTR8: MX 4-126-681-6s
GTR7: E2/E51 4-135-808-1s
GTR7: AR 4-135-808-3s
GTR7: MX 4-135-808-4s
GTR6B: E3 4-135-809-0s
GTR6: E2/E51 4-135-809-1s
GTR6B: AR 4-135-809-3s
GTR6B: AUS 4-135-809-4s
PART NO

5
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
TABLE OF CONTENTS
1. DISASSEMBLY
1-1. Case (Top)............................................................................ 7
1-2. Tape Mechanism Deck......................................................... 7
1-3. Loading panel ...................................................................... 8
1-4. Front Panel Section.............................................................. 8
1-5. MIC Board, USB Board, MICRV Board,
Headphone Board................................................................ 9
1-6. Display Board, STR Board, CD SW Board......................... 9
1-7. Tuner pack ......................................................................... 10
1-8. Subtrans Board .................................................................. 10
1-9. DC Fan, Power Transformer (T1200)................................ 11
1-10. Main Board, Front Boars Section...................................... 11
1-11. Front Board, GTH Subwoofer Board ............................... 12
1-12. Back Panel Section, DC Fan.............................................. 12
1-13. CD Block Section .............................................................. 13
1-14. DMB-19 Board, GTH HUB Board.................................... 13
1-15. Driver MT Board, SW MT Board ..................................... 14
1-16. Optical Pick-up.................................................................. 14
1-17. Sensor Board...................................................................... 15
1-18. Motor(TB) Board............................................................... 15
1-19. Motor (LD) Board ............................................................. 16
2. TEST MODE .............................................................. 17
3. MECHANICAL ADJUSTMENTS .........................19
4. ELECTRICAL ADJUSTMENTS ..........................20
5. DIAGRAMS
5-1. Block Diagram — USB Section —................................... 22
5-2. Block Diagram — RF/Servo Section — ........................... 23
5-3. Block Diagram — Tape/Tuner Section —......................... 24
5-4. Block Diagram — Main Section — .................................. 25
5-5. Block Diagram — AMP/Subwoofer Section —................ 26
5-6. Block Diagram — Display/Power Section —................... 27
5-7. Circuit Boards Location..................................................... 28
5-8. Printed Wiring Board — Display Board —....................... 30
5-9. Schematic Diagram — Display Board — ......................... 31
5-10. Printed Wiring Boards — DMB19 Board — .................... 32
5-11. Schematic Diagram — DMB19 Board (1/4) —................ 33
5-12. Schematic Diagram — DMB19 Board (2/4) —................ 34
5-13. Schematic Diagram — DMB19 Board (3/4) —................ 35
5-14. Schematic Diagram — DMB19 Board (4/4) —................ 36
5-15. Printed Wiring Board — Front Board — .......................... 37
5-16. Schematic Diagram — Front Board — ............................. 38
5-17. Printed Wiring Board — Main Board —........................... 39
5-18. Schematic Diagram — Main Board (1/5) —..................... 40
5-19. Schematic Diagram — Main Board (2/5) —..................... 41
5-20. Schematic Diagram — Main Board (3/5) —..................... 42
5-21. Schematic Diagram — Main Board (4/5) —..................... 43
5-22. Schematic Diagram — Main Board (5/5) —..................... 44
5-23. Printed Wiring Board — MIC and MIC RV Board —...... 45
5-24. Schematic Diagram — MIC and MIC RV Board —......... 46
5-25. Printed Wiring Board — STR and CD_SW Board — ...... 47
5-26. Schematic Diagram — STR and CD_SW Board — ......... 48
5-27. Printed Wiring Board — Trans and Sub Trans Board — .. 49
5-28. Schematic Diagram — Trans and Sub Trans Board —..... 50
5-29. Printed Wiring Board — Sub Woofer Board — ................ 51
5-30. Schematic Diagram — Sub Woofer Board —................... 52
5-31. Printed Wiring Boards —
Headphone and USB CD Board —................................... 53
5-32. Schematic Diagram —
Headphone and USB CD Board —................................... 54
5-33. Printed Wiring Board — HUB Board —........................... 55
5-34. Schematic Diagram — HUB Board — ............................. 56
5-35. Printed Wiring Board — DRIVER Board — .................... 57
5-36. Printed Wiring Board — DRIVER Board — .................... 58
6. EXPLODED VIEWS
6-1. Main Section...................................................................... 66
6-2. Back Panel Section ............................................................ 67
6-3. Front Panel Section (1) ...................................................... 68
6-4. Front Panel Section (2) ...................................................... 69
6-5. Chassis Section .................................................................. 70
6-6. CD Mechanism Section (1) ............................................... 71
6-7. CD Mechanism Section (2) ............................................... 72
7. ELECTRICAL PARTS LIST ................................. 73

6
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
SECTION 1
DISASSEMBLY
Note : This set can be disassembled in the order shown below.
1-19. MOTOR(LD) BOARD
(Page 16)
1-1. CASE (TOP)
(Page 7)
1-2. TAPE MECHANISM DECK
(Page 7)
SET
1-9. DC FAN, POWER TRANSFORMER
(Page 11)
1-16. OPTICAL PICK-UP
(Page 14)
1-15. DRIVER MT BOARD,
SW MT BOARD
(Page 14)
1-17. SENSOR BOARD
(Page 15)
1-3. LOADING PANEL
(Page 8)
1-10. MAIN BOARD,
FRONT BOARD SECTION
(Page 11)
1-4. FRONT PANEL SECTION
(Page 8) 1-18. MOTOR(TB) BOARD
(Page 15)
1-8. SUBTRANS BOARD
(Page 10)
1-12. BACK PANEL SECTION, DC FAN
(Page 12)
1-13. CD BLOCK SECTION
(Page 13)
1-14. DMB-19 BOARD,
GTH HUB BOARD
(Page 13)
1-11. FRONT BOARD,
GTH SUBWOOFER BOARD
(Page 12)
1-5. MIC BOARD, USB BOARD
MICRV BOARD,
HEADPHONE BOARD
(Page 9)
1-7. TUNER PACK
(Page 10)
1-6. DISPLAY BOARD,
STR BOARD,
CD SW BOARD
(Page 9)

7
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
1-2. TAPE MECHANISM DECK (only for HCD-GTR6B/GTR8B)
Note : Follow the disassembly procedure in the numerical order given.
1-1. CASE (TOP)

 two screws
(case 3 TP2)
 two screws
(case 3 TP2)

one screw
(case 3 TP2)



RT
two screws
(+BVTP 3 x 8)
 two screws
(+BVTP 3 x 8)
RB two screws
(+BVTP 3 x 8)
RI case (top)
 wire (flat type) (9 core)
(CN040)
 panel (side-R)
 panel (side-L)
one screw
(case 3 TP2)
 CN020 (8P)
(TC CASE TOP only for
HCD-GTR6B/ GTR8B)
 wire (flat type) (9 core)
(CN040)
 CN020 (8P)
b
b
a
a
RG
RH
RK
RE

one screw
(+BVTP 2.6 (3CR))

SHIELD PLATE (TOP)
(GTR6B/GTR8B)

four screws
(+BVTP 2.6 (3CR))

one screw
(+BVTP 2.6 (3CR))

one screw
(+BVTP 2.6 (3CR))

SHIELD PLATE (TCM)
(GTR6B/GTR8B)

tape mechanism deck
(TC CASE TOP only for
HCD-GTR6B/ GTR8B)

8
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
1-3. LOADING PANEL
1-4. FRONT PANEL SECTION

loading panel

Pull-out the disc tray.

Turn the gear to the direction of the arrow.
gear
chassis side
CD mechanism deck (CDM74KF)
By using (-) screw driver

wire (flat type) (11 core)
(CN151)

wire (flat type) (23 core)
(CN150)
CN1501 (10P)

front panel section


four screws
(+BVTP 3 x 8)

two screws
(+BVTP 3 x 8)

CN400 (13P)


9
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
1-6. DISPLAY BOARD, STR BOARD, CD SW BOARD
1-5. MIC BOARD, USB BOARD, MICRV BOARD, HEADPHONE BOARD
R
knob (MIC)

six screws
(+BVTP 2.6 (3CR))

USB board

MIC board

one screw
(+BVTP 2.6 (3CR))

two screws
(+BVTP 2.6 (3CR))

Shield Plate (MIC)

one screws
(+BVTP 2.6 (3CR))

two screws
(+BVTP 2.6 (3CR))
RB MICRV board
 Headphone board
GROUND PLATE
(USB)

three screws
(+BVTP 2.6 (3CR))

four screws
(+BVTP 2.6 (3CR))
RB
six screws
(+BVTP 2.6 (3CR))
RG
two screws
(+BVTP 2.6 (3CR))

meter display assy

Display board

wire (flat type) (23 core)
(CN902)
RE
STR board
RH
CN901 (2P)
RT
CN903 (6P)
RI
CD SW board

knob (volume)

nut

holder (jog)

knob jog assy
R
gear (encoder)

10
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
1-7. TUNER PACK
1-8. SUBTRANS BOARD

tuner pack

wire (flat type) (5 core)
(CN1)

two screws
(+BVTT 3 x 8)

SUBTRANS board

CN1201 (4P), CN1202 (2P)

CN1200 (2P)

CN1203 (4P)

Bracket (Subtrans)

two screws
(+BVTP 3 x 8)

two screws
(+BVTP 3 x 8)

11
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
1-10. MAIN BOARD, FRONT BOARD SECTION
1-9. DC FAN, POWER TRANSFORMER (PT1250)

TRANS board

CN1250 (13P)

CN320 (3P)

power transformer (PT1250)

Bracket Fan

four screws
(+BVTT 4 x 8)

two screws
(+BVTP 3 x 8)

two screws
(+BVTP 3 x 10)

Fan, DC
RG
Main board
RB
wire (flat type) (13 core)
(CN110)
RT
wire (flat type) (23 core)
(CN500)

CN1303 (16P)

Front board section

CN1302 (11P)

CN801 (7P)

CN820 (3P)

one screw
(+BVTP 3 x 8)

one screw
(+BVTP 3 x 8)
RE
CN090 (9P)
R
four screws
(+BVTP 3 x 8)

four screws
(+BVTP 3 x 8)

four screws
(+BVTP 3 x 8)

12
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
1-12. BACK PANEL SECTION, DC FAN
1-11. FRONT BOARD, SUBWOOFER BOARD

Front board
R
heat sink assy

Bracket (PWB)

Bracket (PC)
RG
SUBWOOFER board

two screws
(transistor)

two screws
(+BVTP 3 x 8)
RT
one screw
(+BVTP 3 x 8)
RE
one screw
(+BVTP 3 x 8)
RB
two screws
(transistor)

one screw
(+BVTP 3 x 8)

two screws
(+BVTP 3 x 8)

two screws
(+BVTP 3 x 8)

Bracket (PWB)

DC fan

DC fan

Cover (fan)

back panel section

two screw
(+BVTP 3 x 8)

two screw
(+BVTP 3 x 10)

two screw
(+BVTP 3 x 10)

four screws
(+BVTP 3 x 8)

13
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
1-14. DMB19 BOARD, GTH HUB BOARD
1-13. CD BLOCK SECTION
RB
two screws
(+BVTP 3 x 8)
Cover Dust CDM Assy

two screws
(+BVTP 3 x 8)
Cover Dust (Bottom)

Bracket (CDM Support)

Bracket (CDM Support)

Bracket (TRANS)

three screws
(+BVTP 3 x 8)

two screws
(+BVTP 3 x 8)

one screw
(+BVTP 2.6 x 8)

three screws
(+BVTP 3 x 8)
R
two screws
(+BVTP 3 x 8)

CD block section
RT
GTH HUB board

DMB19 board

CN201 (6P)

wire (flat type) (24 core)
(CN101)

wire (flat type) (9 core)
(CN1106)

Bracket (MTK-CD)
RB
wire (flat type) (7 core)
(CN1556)

one screw
(+BVTP 3 x 8)

Bracket (USB HUB)
Sheet Dust (BU)
R
two screws
(+BVTP 3 x 8)

four screws
(+BVTP 3 x 8)

one screw
(+BVTP 3 x 8)

14
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
1-15. DRIVER MT BOARD, SW MT BOARD
1-16. OPTICAL PICK-UP

CN703 (4P)
 CN704 (2P)

DRIVER MT board
 SW MT board
 two screws
(+BVTT (M2.6))

one screw
(+BVTT (M2.6))
 wire (flat type) (5 core)
(CN702)
 insulator screw
 optical pick-up
(KHM-313CAB/C2NP)
 insulator screw
 insulator screw
 insulator screw
 insulator
 insulator
 insulator
 insulator
floating screw
(+PTPWH M2.6)
CD assy

15
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
1-17. SENSOR BOARD
1-18. MOTOR (TB) BOARD

t ray
 b elt (table)
 p ulley (table)
 one screw
(+BTTP (M2.6))
 SENSOR board
 g ear (geneva)
 CN731
(3P)

floating screw
(+PTPWH M2.6)
 floating screw
(+PTPWH M2.6)
 floating screw
(+PTPWH M2.6)

Remove the two solderings of motor.

MOTOR (TB) board
 t able motor assy (M741)
 two screws
(+BTTP (M2.6))


stopper

stopper
table
 wire (flat type) (5 core)
(CN742)

16
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
1-19. MOTOR (LD) BOARD
 Remove the two solderings of motor.
 MOTOR (LD) board

b elt (loading)
 l oading motor assy (M751)
 two screws
(+BTTP (M2.6))

17
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
SECTION 2
TEST MODE
4. When the [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 [VOLUME] knob is turned counterclockwise even
slightly, the sound volume decreases to its minimum and a
message “VOLUME MIN” appears on the fluorescent indica-
tor tube.
•Tape function (only for HCD-GTR6B/GTR8B)
1. Inserted a tape in deck. The function is changed to VIDEO
automatically when the recording is started by pressing [REC
TO TAPE] then press [ENTER] button. During recording the
ALC (Automatic Logic Control) is turned on.
2. During recording, press ALBUM - will stop the recording
and the function is changed to TAPE and rewind the tape in
Deck until the recording start position and playback of the
tape in Deck is started.
•To release from MC Test mode
1. To release from this mode, press [POWER] 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 [x] button, [ENTER] button, and [POWER] button si-
multaneously.
2. The fluorescent indicator tube becomes blank for a 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:
1. Press [POWER] button to turn the set ON.
2. Press [x] button and [OPTIONS] button simultaneously. The
message “VACS OFF” or “VACS ON” appears on the fluores-
cent 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 Arabian mod-
els.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Press [TUNER/BAND] / [TUNER AM] button to select the
“A M ”.
3. Press [POWER] button to turn the set OFF.
4. Press [ENTER] button and [POWER] button simultaneously.
The system will turn ON automatically. The message “AM
9K STEP” or “AM 10K STEP” appears on the fluorescent in-
dicator tube and thus the channel step is changed.
[GC TEST MODE]
• This mode is used to check the fluorescent indicator tube, LEDs,
keys,VOLUME jog, OPERATION DIAL jog, model, destination
and software version.
Procedure:
1. Press [x] button, [ENTER] button and [DISC 2] button si-
multaneously.
2. All LEDs and segments in fluorescent indicator tube are light-
ed up. All LEDs are lighted up in red color except for [ B]
LED where the LED is lighted up in red and blue color,
[ A] LED in blue color and SUBWOOFER ON/OFF 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 model destination, SC, MDK, GC, SYS, CD,
CDMA, CDMB, ST, TC, TA, TM and MTR in this order, and
returns to the model destination 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 in-
creases by one. Turn the [OPERATIONAL DIAL] counter-
clockwise; “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 [VOLUME]
knob is tur ned clockwise, or it decreases in the manner of 0, 9,
8, 7 ... if [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] but-
ton again, another half of alternate segments in fluorescent
indicator tube and LED would light up. Press [DISC SKIP/
EX-CHANGE] button again would cause all segments will
lights off and press [DISC SKIP/EX-CHANGE] button again
all segments will 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 and Tape.
Procedure:
• To enter MC Test Mode
1. Press [x] button, [ENTER] button and [DISC 3] button si-
multaneously.
2. The CD number indicators flash on the fluorescent indicator
tube. The function is changed to VIDEO.
•Check of Amplifier
1. Press [EQ BAND] button repeatedly until a message “GEQ
MAX” appears on the fluorescent indicator tube. GEQ in-
creases to its maximum.
2. Press [EQ BAND] button repeatedly until a message “GEQ
MIN” appears on the fluorescent indicator tube. GEQ de-
creases to its minimum.
3. Press [EQ BAND] button repeatedly until a message “GEQ
FLAT” appears on the fluorescent indicator tube. GEQ is set
to flat.

18
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
[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:
1. Press [POWER] button to turn the set ON.
2. Select CD function and waiting until CD no disc confirm.
3. Press [x] button, [SOUND FLASH] button and [POWER]
button simultaneously. The set will power 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. Then 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:
1. Press [POWER] button to turn the set ON.
2. Select CD function.
3. Press [CD] button and [POWER] button simultaneously. The
set will power off automatically.
4. After the “STANDBY” blinking display fin i s h e s , a m e s s a g e
“MECHA LOCK” is displayed on the fluorescent indicator
tube and the CD ship mode is set.
5. The AC power OFF.
[CD TRAY LOCK MODE / DISC THEFT
PREVENTION]
• This mode let you lock the disc tray. When this mode is activated,
the disc tray will not open when [OPEN/CLOSE] button or [EX-
CHANGE] button is pressed. The message “LOCKED” will be
displayed on the fluorescent indicator tube.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Select CD function.
3. Press [x] button and [OPEN/CLOSE] button simultaneously
and hold down until “LOCKED” or “UNLOCKED” dis-
played on the fluorescent indicator tube (around 5 seconds).
[TCM OFFLINE MODE]
(only for HCD-GTR6B/GTR8B)
• This mode prevents set from power off automatically when TCM
is not connected. Therefore, measurements can be done even when
TCM is not connected.
Procedure:
1. When the system in turned off, press [EQ BAND/MEMORY]
button, [STOP] button and [POWER] button simultaneously.
The set will power on automatically.
2. The message “TCM OFFLINE” will be displayed on the fluo-
rescent indicator tube.
[VACS DISPLAY]
• This mode is used to check the VACS level.
Procedure:
1. Press [POWER] button to turn on the system.
2. Press [x] button, [SOUND FLASH] button and [DISC SKIP/
EX-CHANGE] button simultaneously.
3. The VACS Level Display, the fluorescent indicator tube dis-
plays “VATB F APC”. “V” represent VACS , A represent
VACS level which is triggered by signal level, “T” represent
Thermal VACS NEO, B represent VACS level which is trig-
gered 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.
[METER AGING TEST MODE]
• This mode use in factory to perform the non-stop aging mode for
meter device.
Procedure:
1. Press [POWER] button to turn on the system.
2. Press [EQ BAND/MEMORY] button and [METER MODE]
button simultaneously.
[ERROR MESSAGE]
1. METER ERROR CODE CHECK
• This mode is used to check the number of trigger for Meter Pointer
to initial switch and end switch. The switches will trigger during
meter initialize in AC supply on condition.
Procedure:
1. Press [POWER] button to turn on the system.
2. Press [x] button, [EQ BAND/MEMORY] button and [ME-
TER MODE] button simultaneously.
The Meter Error Code will appear on the fluorescent indicator
tube displays
• Display
Display on fluorescent indicator tube,
IxxxxxMyyyyy
Ixxxxx = total number of Initial Switch touch by Meter
pointer. The Initial Switch will touch twice during meter
initialized process.
Myyyyy = total number of End Switch touch by Meter
pointer. The End Switch will touch one times during meter
initialized process.

19
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
(only for HCD-GTR6B/GTR8B)
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 demagne-
tizer.
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 • m
REV
CQ-102RC 2 to 6 g • cm
back 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 3
MECHANICAL ADJUSTMENTS

20
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
[FM Tune Level Check]
Procedure:
1. Turn the power on.
2. Input the following signal from Signal Generator to FM an-
tenna 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 for A, B and C sig-
nals.
The mark of “TUNED” means “The selected station signal is
received in good condition.”
FM signal generator
OUT (75 7)
SET
SECTION 4
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 adjust-
ment 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]
Note: Perform this adjustments for Single deck
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 +
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
(L-CH & R-CH)
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
(only for HCD-GTR6B/GTR8B)