Sony HCDGTX-88 Service manual

HCD-GTX88

SERVICE MANUAL

Ver. 1.0 2007. 06

• HCD-GTX88 is the tuner, deck, CD and amplifier section in MHC-GTX88.

CD Section

Tape Deck Section

Model Name Using Similar Mechanism NEW CD Mechanism Type CDM74KF-K6BD91UR-WOD//M Optical Pick-up Name KSM-213DCP/C2NP

Model Name Using Similar Machanism HCD-GN1100D

E Model

Australian Model

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, impedance 47 kilohms

MIC: Sensitivity 1 mV,

impedance 10 kilohms (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.

– Continued on next page –

CD DECK RECEIVER

HCD-GTX88

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)

531 – 1,710 kHz (with the

interval set at 9 kHz) Other models: 531 – 1,602 kHz (with the

interval set at 9 kHz)

530 – 1,610 kHz (with the

interval set at 10 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 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.

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 P ARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

HCD-GTX88

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 flo w) 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.

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 pickup 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.

This appliance is claassified as a CLASS 1 LASER product. This label is located on the rear exterior.

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

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.

HCD-GTX88

MODEL IDENTIFICATION

– MODEL NUMBER LABEL –

PART No.

• Abbreviation E2 : 120V AC area in E model E51 : Chilean and Peruvian model AR : Argentina model AUS : Australian model

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

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

6-13. Schematic Diagram — Main Section (2/4) — .................. 45

6-14. Schematic Diagram — Main Section (3/4) — .................. 46

6-15. Schematic Diagram — Main Section (4/4) — .................. 47

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

7-3. Front Panel Section (2)...................................................... 80

7-4. Front Panel Section (3)...................................................... 81

7-5. Chassis Section ................................................................. 82

7-6. CD Mechanism Section (1) ............................................... 83

7-7. CD Mechanism Section (2) ............................................... 84

8. ELECTRICAL PARTS LIST ........................................85

HCD-GTX88

1234

SECTION 1

GENERAL

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

This section is extracted from instruction manual.

– Top view

wf wd

ws wa

ql qk qj

5 6

9 q; qa qs

qdqfqgqh

wkwj wgwh

HCD-GTX88

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)

I PUSH OPEN/CLOSE Z (Deck B)

J ENTER (pages 23, 29, 33, 48)

K ERASE (page 23)

L MASTER VOLUME (pages 17,

M MIC (jack) (pages 36, 43, 52)

USB

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.

(page 30)

Press to insert or eject a tape.

Deck B (pages 30, 31, 37, 48)

Press to enter the selection.

Press to erase MP3 audio tracks or folders on the connected optional USB device (Digital music player or USB storage media).

24, 39, 43)

Turn to adjust the volume.

Connect an optional microphone.

MIC LEVEL (pages 32, 36, 43)

Turn to adjust the microphone volume.

Guide to parts and controls

Continued

HCD-GTX88

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)

USB

(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.

– Display

qaq

432 5 6 7 81

HCD-GTX88

Guide to parts and controls

MP3

USB

SUR

FLANGER MATRIX

MP3

CHORUS

SUR

BOOSTER

FM AM ID3 AUTO

DELAY

GROOVE

LINK

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).

PRESET

MONO

MHz

kHz

TUNED

REC

PLAY

SLEEP

SHUF

TAPE

USB

PGM

REP 1

ALL

1 DISCS

USB

MEMORY

REC

SYNC

K Indicators for the TAPE function

(page 30).

A B

“” 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.

;

Continued

HCD-GTX88

Subwoofer A (SS-WG88A)

1 2

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

1qg

qd 3 qs

q; 9

6 7

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.

HCD-GTX88

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.

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.

Guide to parts and controls

*The VOLUME + button has a tactile dot.

Use the tactile dot as a reference when operating the system.

HCD-GTX88

Note : Disassemble the unit in the order as shown below.

SET

2-1. CASE (TOP)

(Page 13)

2-2. LOADING PANEL

(Page 13)

2-3. TUNER PACK

(Page 14)

SECTION 2

DISASSEMBLY

2-9. COVER (CDM)

(Page 17)

2-4. CD BLOCK SECTION

(Page 14)

2-5. FRONT PANEL SECTION

(Page 15)

2-6. TAPE MECHANISM DECK,

MIC BOARD, USB CONNECTOR BOARD (Page 15)

2-10. BACK PANEL SECTION

(Page 17)

2-16. DRIVER BOARD,

SW BOARD, USB BOARD (Page 20)

2-18. SENSOR BOARD

2-19. MOTOR (TB) BOARD

2-20. MOTOR (LD) BOARD

2-7. PANEL BOARD,

2-15. BD91 BOARD

(Page 20)

2-17. OPTICAL PICK-UP

(Page 21)

(Page 22)

FUNCTION BOARD, JOG BOARD (Page 16)

2-11. POWER BOARD SECTION

(Page 18)

2-12. MAIN BOARD

(Page 18)

2-13. SUBWOOFER BOARD,

POWER BOARD (Page 19)

2-8. CD-SW BOARD

(Page 16)

2-14. POWER TRANSFORMER

(T1200) (Page 19)

Note : Follow the disassembly procedure in the numerical order given.

2-1. CASE (TOP)

panel (side-L)

two

screws

(case 3 TP2)

screw

(case 3 TP2)

two screws

(+BVTP 3

10)

two screws

(+BVTP 3

case (top)

10)

panel (side-R)

two

(case 3 TP2)

HCD-GTX88

screws

2-2. LOADING PANEL

CD mechanism deck (CDM74KF)

Turn the pulley to the direction of the arrow.

pulley

Front panel side

Pull-out the disc tray.

loading panel

two screws

(+BVTP 3

screw

(case 3 TP2)

10)

HCD-GTX88

2-3. TUNER PACK

wire (flat type) (9 core)

(CN1)

tuner pack

two

screws

(+BVTP 3

2-4. CD BLOCK SECTION

CD block section

CN901 (2P)

CN903 (5P)

tapping screw

wire (flat type) (13 core)

(CN701)

wire (flat type) (21 core)

(CN5053)

wire (flat type) (27 core)

(CN5051)

three

(+BVTP 3

screws

12)

tapping screw

lug

(+BVTP 3

screw

2-5. FRONT PANEL SECTION

front panel section

wire (flat type) (11 core)

(CN509)

wire (flat type) (17 core)

(CN508)

CN903 (3P)

CN100 (4P)

HCD-GTX88

CN503 (3P)

CN507 (8P)

three

(+BVTP 3

screws

(+BVTP 3

screws

2-6. TAPE MECHANISM DECK, MIC BOARD, USB CONNECTOR BOARD

three

screws

(+BVTP 2.6 (3CR))

tape mechanism deck

(+BVTP 2.6 (3CR))

three

screws

two

screws

(+BVTP 2.6 (3CR))

knob (MIC)

bracket (MIC shield)

USB CONNECTOR board

two

screws

(+BVTP 2.6 (3CR))

MIC board

two

screws

(+BVTP 2.6 (3CR))

HCD-GTX88

)

2-7. PANEL BOARD, FUNCTION BOARD, JOG BOARD

two

screws

(+BVTP 2.6 (3CR))

holder (jog)

nut

PANEL board

CN956 (2P)

wire (flat type) (25 core)

(CN900)

knob jog assy

two

(+BVTP 2.6 (3CR))

screws

five

screws

(+BVTP 2.6 (3CR))

CN904 (3P)

three

(+BVTP 2.6 (3CR))

JOG board

screws

CN905 (2P)

four

(+BVTP 2.6 (3CR))

six

(+BVTP 2.6 (3CR))

PANEL board

screws

knob (volume)

2-8. CD-SW BOARD

CD-SW board

gear (encoder)

escucheon (CD)

two

screws

(+BVTP 2.6 (3CR)

three

(+BTTP (M2.6))

screws

two

screws

(+BTTP (M2.6))

2-9. COVER (CDM)

CD mechanism dec

cover (CDM)

HCD-GTX88

(+BVTP 3

2-10. BACK PANEL SECTION

screw

CN1204 (4P)

10)

CN1200 (3P)

CN580 (3P)

two screws

(+BVTP 3

10)

CN1202 (2P)

wire (flat type) (17 core)

(CN1502)

(+BVTP 3

two

screws

four

screws

(+BVTP 3

two

screws

three

(+BVTP 3

screws

10)

back panel section

HCD-GTX88

)

2-11. POWER BOARD SECTION

(+BV3 (3-CR))

DC fan(M892)

two

screws

(+BV3 (3-CR))

screw

CN581 (3P)

POWER board section

two

screws

(+BV3 (3-CR)

two

screws

(+BVTP 3

three

(+BVTP 3

screws

10)

2-12. MAIN BOARD

CN700

CN600

CN1214 (6P)

POWER board assy

CN1212 (7P)

CN601

MAIN boar

screw

(+BVTP 3

10)

2-13. SUBWOOFER BOARD, POWER BOARD

)

screw

(+BV3 (3-CR))

SUBWOOFER board

heat sink assy

two

screws

(+BVTP 3

holder

bracket

(+BVTP 3

two

screws

(transistor)

screw

(+BVTP 3

two

screws

10)

HCD-GTX88

10)

POWER board

CN607 (5P)

2-14. POWER TRANSFORMER (T1200)

CN1214 (6P)

CN1212 (7P)

DC fan(M892)

three

two

screws

(+BV3 (3-CR))

screws

(+BVTP 3

TRANS board

two

screws

10)

two

screws

(+BVTP 3

three

two

screws

(transistor)

10)

power transfomer (T1200

screws

CN581 (3P)

HCD-GTX88

2-15. BD91 BOARD

Remove the four solders.

BD91

board

wire (flat type) (16 core)

(CN301)

2-16. DRIVER BOARD, SW BOARD, USB BOARD

DRIVER board

two

screws

(+BVTP2.6 (3CR))

USB board

CN704 (2P)

wire (flat type) (5 core)

(CN702)

two

screws

(+BVTT (M2.6))

CN703 (4P)

screw

(+BVTT (M2.6))

SW board

2-17. OPTICAL PICK-UP

optical pick-up

(BU-K6BD91UR)

two

insulators

two

coil springs

(insulator)

two

insulators

two

(insulator)

HCD-GTX88

coil springs

2-18. SENSOR BOARD

ray

floating

(+PTPWH M2.6)

floating

(+PTPWH M2.6)

screw

(+BTTP (M2.6))

screw

ear (geneva)

two floating

(+PTPWH M2.6)

crew

SENSOR board

CN731 (3P)

screws

two floating

(+PTPWH M2.6)

screws

elt (table)

floating

(+PTPWH M2.6)

ulley (table)

screw

HCD-GTX88

2-19. MOTOR (TB) BOARD

stopper

table

2-20. MOTOR (LD) BOARD

Remove the two solderings of motor.

two

screws

(+BTTP (M2.6))

two

(+BTTP (M2.6))

stopper

able motor assy (M741)

wire (flat type) (5 core)

(CN742)

MOTOR (TB) board

screws

MOTOR (LD) board

oading motor assy (M751)

elt (loading)

SECTION 3

TEST MODE

HCD-GTX88

[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, BD A version, BDB version, ST version, TC version, T A v ersion, TM v ersion, 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” v alue 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.

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 v olume 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 the ALC (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:

1. Press ?/1 button to turn on the system.

2. Press x button and [ILLUMINATION] button simultaneously. The message “VACS OFF” or “VACS ON” appears on the fluorescent indicator tube.

Procedure:

•To enter MC Test Mode

1. Press x button, [ENTER] button and [DISC 3] button 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.

2. Press [EQ BAND/MEMORY] button repeatedly until a message “GEQ MIN” appears on the fluorescent indicator tube. GEQ decreases to its minimum.

3. Press [EQ BAND/MEMORY] button repeatedly until a message “GEQ FLAT” appears on the fluorescent indicator tube. GEQ is set to flat.

[TUNER STEP CHANGE]

•The step interval of AM c hannels can be toggled between 9 kHz and 10 kHz. This mode is not available for Saudi Arabia model.

Procedure:

1. Press ?/1 button to turn on the system.

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.

HCD-GTX88

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

[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:

1. Press ?/1 button to turn on the system.

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 fluorescent indicator tube.

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:

1. Press ?/1 button to turn on the system.

2. Select CD function.

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. T o release fr om this mode, press ?/1 button or disconnect the

power cord to turn the power OFF.

• Aging mode sequence:

HCD-GTX88

D*$$%%&&#– #00

[CD ERROR CODE MODE]

• Display the CD error code when an error occurred.

Procedure:

1. Press x button, [ENTER] button and [DISC 1] button 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.

DISPLAY OF

TOTAL ERROR

BUTTON

DISPLAY OF

MECHANICAL

ERRORS

BUTTON

DISPLAY OF

NO DISC

ERRORS

BUTTON

4. To clear the error record, operate the cold reset. (Refer to the “MC COLD RESET”.)

5. T o release from this mode , press the ?/1 button or disconnect the power OFF.

• Display of total error

Em**Ed**

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.

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.

%% : 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.

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).

HCD-GTX88

[CD REPEAT 5 LIMIT OFF MODE]

• The number of repeat for CD playback is 5 times when the repeat mode is “REPEAT ALL”. This mode ena bles CD to repeat playback for limitless times.

Procedure:

1. Press ?/1 button to turn on the system.

2. Select CD function.

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:

1. Press ?/1 button to turn on the system.

2. Select CD function.

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:

1. Press ?/1 button to turn on the system.

2. Select CD function.

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.

Procedure:

1. Press ?/1 button to turn on the system.

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 acti vated,

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:

1. Press ?/1 button to turn on the system.

2. Select CD function.

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 production.

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 fluorescent indicator tube.

•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:

1. Press ?/1 button to turn on the system.

2. Press x button, [CHORUS] button and [DISC SKIP/EX- CHANGE] button simultaneously.

3. The VACS Level Display , the fluorescent indicator tube displays “VATB F APC”. “V” represent VACS, A represent VACS le vel which is triggered by signal level, “T” represent Thermal VACS NEO, B represent VACS 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.

•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.

HCD-GTX88

SECTION 4

MECHANICAL ADJUSTMENTS

[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

Mode Torque meter Meter reading

2.9m N • m to 6.9m N • m

FWD CQ-102C 30 to 70 g • cm

(0.42 – 0.97 oz • inch)

FWD back tension

REV CQ-102RC 30 to 70 g • cm

REV back tension

FF/REW CQ-201B 49 to 170 g • cm

CQ-102C 2 to 6 g • cm

CQ-102RC 2 to 6 g • cm

0.15m N • m to 0.59m N • m

(0.03 – 0.08 oz • inch)

2.9m N • m to 6.9m N • m

(0.42 – 0.97 oz • inch)

0.15m N • m to 0.59m N • m

(0.03 – 0.08 oz • inch)

4.8m N • m to 16.7m N • m

(0.68 – 2.36 oz • inch)

HCD-GTX88

SECTION 5

ELECTRICAL ADJUSTMENTS

TUNER SECTION 0 dB = 1 µV DECK SECTION 0 dB = 0.775 V

[FM T une Level Check]

FM signal generator

SET

OUT (75

Ω

)

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 for A, B and C signals.

The mark of “TUNED” means “The selected station signal is received in good condition.”

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 RCH.

7. Switches and controls should be set as follows unless otherwise specified.

•Test Tape

Tape Signal Used for

P-4-A100 10 kHz, –10 dB Azimuth Adjustment

[RECORD/PLAYBACK HEAD AZIMUTH ADJUST-MENT]

DECK A DECK B

Note: Perform this adjustments for both decks

Procedure:

1. Mode: Playback

test tape P-4-A100 (10 kHz, –10 dB)

set

MAIN board CN510 Pin 1 (L-CH) Pin 3 (R-CH)

MAIN board CN510 Pin 2 (GND)

level mete

–

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.

output level

within 1dB

L-CH peak

R-CH peak

within 1dB

screw position

L-CH peak

screw position

R-CH peak

HCD-GTX88

3. Mode: Playback

test tape P-4-A100 (10 kHz, –10 dB)

L-CH

MAIN board CN510

R-CH

waveform of oscilloscope

in phase 45°90°135°180

pin 1

pin 2

L R

pin 3

good

oscilloscop

wrong

4. After the adjustments, apply suitable locking compound to the pats adjusted.

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

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]

oscilloscope

BD91 board

TP106(FE)

TP124(VC)

Procedure :

1. Connect an oscilloscope to TP106 (FE) and TP124 (VC).

2. Turn the power on.

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.

+ –

forward

reverse

S-curve waveform

symmetry

within 3

0.5Vp-

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.

HCD-GTX88

[RF LEVEL CHECK]

oscilloscope

BD91 board

TP123(RFO)

TP124(VC)

Procedure :

1. Connect an oscilloscope to TP123 (RFO) and TP124 (VC).

2. Turn the power on.

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 wav eform means that the shape “ ◊ ” can be

clearly distinguished at the center of the waveform.

+ –

RF signal waveform

Connecting Location: CD board

– BD91 Board (SIDE B) –

TP124

(VC)

(FE)

IC101

TP123

(RFO)

100

TP106

VOLT/DIV: 200 mV

TIME/DIV: 500 ns

level: 1.3 ± 0.3 Vp-p

IC401

+ 74 hidden pages

Sony HCDGTX-88 Service manual

TABLE OF CONTENTS

GENERAL

DISASSEMBLY

case (top)

loading panel

tuner pack

CD block section

front panel section

CD-SW board

cover (CDM)

back panel section

POWER board section

optical pick-up

SENSOR board

MOTOR (TB) board

MOTOR (LD) board

TEST MODE

MECHANICAL ADJUSTMENTS

ELECTRICAL ADJUSTMENTS