Sony HCD-XGR88 Service Manual

HCD-XGR88

SERVICE MANUAL

Ver 1.0 2003.03

• HCD-XGR88 is the Amplifier,
CD player, tape deck and tuner
section in LBT-XGR88.

Model Name Using Similar Mechanism HCD-XGR80

CD CD Mechanism Type CDM37B-30BD60C

Section Base Unit Name BU-30BD60C

Optical Pick-up Name A-MAX.3

TAPE Model Name Using Similar Mechanism NEW

Section Tape Mechanism Type CWM43RR23

E Model

SPECIFICATIONS

Amplifier section

The following measured at AC 120, 220, 230 – 240 V 50/60 Hz
DIN power output (rated): 145 + 145 watts (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):

180 x 2 + 180 x 2 watts

(6 ohms at 1 kHz, 10% THD)
Inputs
PHONO IN
(phono jacks): sensitivity 3 mV, impedance 47 kilohms
MIC
(phone jack): sensitivity 1 mV, impedance 10 kilohms
GAME INPUT AUDIO L/R
(phono jacks): sensitivity 250 mV, impedance 47 kilohms
GAME INPUT VIDEO
(phono jack): 1Vp-p, 75 ohms
MD (VIDEO) IN L/R (phono jacks):

sensitivity 450 mV(250 mV),

impedance 47 kilohms
Outputs
PHONES
(stereo phone jack): accepts headphones of 8 ohms or more
MD (VIDEO) OUT L/R
(phono jacks): voltage 250 mV, impedance 1 kilohms
VIDEO OUT
(phono jack): max. output level 1Vp-p,

load impedance 75 ohms
FRONT SPEAKER: accepts impedance of 6 to 16 ohms

(SUPER WOOFER)

accepts impedance of 6 to 16 ohms

(TWEETER & WOOFER)

COMPONENT Hi-Fi STEREO SYSTEM

CD player section

System Compact disc digital audio system
Laser Semiconductor laser (λ=795 nm)

Emission duration: continuous

Frequency response 2 Hz – 20 kHz (±0.5 dB)
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
CD OPTICAL DIGITAL OUT
(square optical connector jack, rear panel)
Wavelength 660 nm
Output level –18 dBm

Tape deck section

Recording system 4-track 2-channel, stereo
Frequency response 50 – 13,000 Hz (±3 dB), using Sony TYPE I

cassettes

— Continued on next page —

9-877-210-01

2003C0200-1

© 2003.03

Sony Corporation

Home Audio Company

Published by Sony Engineering Corporation

HCD-XGR88

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 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 models: 530 – 1,710 kHz

(with the tuning interval set at 10 kHz)
531 – 1,710 kHz
(with the tuning interval set at 9 kHz)

Other models: 530 – 1,710 kHz

(with the tuning interval set at 10 kHz)
531 – 1,602 kHz
(with the tuning interval set at 9 kHz)

Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz

General

Power requirements 120 V, 220 V or

230 – 240 V AC, 50/60 Hz

Adjustable with voltage selector
Power consumption 330 watts
Dimensions (w/h/d) (Main Unit) Approx. 355 x 425 x 451 mm

Mass (Main Unit) Approx. 17.0 kg
Supplied accessories: AM loop antenna (1)

FM lead antenna (1)

Speaker cords (4)

Speaker pads (8)

Remote Commander (1)

Batteries (2)

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.

CAUTION

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

This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.

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

2

NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic
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 flexible board is easily damaged and should be handled with
care.

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 DIODE AND FOCUS SEARCH OPERATION
CHECK

Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.

HCD-XGR88

• MODEL IDENTIFICATION
– Rear Panel –

MODEL

E2 model

E51 model

• Abbreviation
E2 : Central and South America
E51 : Chilean and Peruvian

PART No.

PARTS No.

4-244-927-4s

4-244-927-5s

3

HCD-XGR88

TABLE OF CONTENTS

1. GENERAL

·········································································· 5

2. DISASSEMBY ··································································· 7

3. TEST MODE ···································································· 16

4. MECHANICAL ADJUSTMENTS ····························· 18

5. ELECTRICAL ADJUSTMENTS ······························· 18

6. DIAGRAMS

6-1. Circuit Board Location ······················································ 21
6-2. Block Diagram – CD Servo Section – ······························· 22

Block Diagram – Tuner/Tape Deck Section – ··················· 23
Block Diagram – Main Section – ······································ 24
Block Diagram

– Display/Key Control/Power Supply Section – ·········· 25
6-3. Printed Wiring Board – BD Section – ······························· 26
6-4. Schematic Diagram – BD Section – ·································· 27
6-5. Printed Wiring Board – Motor LED Section – ·················· 28
6-6. Schematic Diagram –Motor LED Section – ······················ 28
6-7. Schematic Diagram – Main (1/4) Section – ······················ 29
6-8. Schematic Diagram – Main (2/4) Section – ······················ 30
6-9. Schematic Diagram – Main (3/4) Section – ······················ 31
6-10. Schematic Diagram – Main (4/4) Section – ······················ 32
6-11.Printed Wiring Board – Main Section – ····························· 33
6-12. Printed Wiring Board – CD-L, CD-R Section – ················ 34
6-13. Schematic Diagram – CD-L, CD-R Section – ··················· 35
6-14. Printed Wiring Board – TC-A, TC-B Section – ················ 36
6-15. Schematic Diagram – TC-A, TC-B Section – ··················· 37
6-16.Printed Wiring Board – Panel VR, Key Section – ············· 38
6-17. Schematic Diagram – Panel VR, Key Section – ················ 39
6-18.Printed Wiring Board – Panel FL Section – ······················· 40
6-19. Schematic Diagram – Panel FL Section – ························· 41
6-20. Printed Wiring Board – Power Amp Section – ·················· 42
6-21. Schematic Diagram – Power Amp Section –····················· 43
6-22. Printed Wiring Board – Sub Amp Section – ····················· 44
6-23. Schematic Diagram – Sub Amp Section –························· 45
6-24. Printed Wiring Board – Mic Section – ······························ 46
6-25. Schematic Diagram – Mic Section – ································· 46
6-26. Printed Wiring Board – Power Supply Section –·············· 47
6-27. Schematic Diagram – Power Supply Section – ················· 47
6-28. IC Pin Function Description ············································· 48
6-29. IC Block Diagram ····························································· 53

7. EXPLODED VIEWS

7-1. Case,Back Panel Section ··················································· 56
7-2. Front Panel Section-1 ························································ 57
7-3. Front Panel Section-2 ························································ 58
7-4. Chassis Section ·································································· 59
7-5. CD Mechanism Deck Section
(CDM-30BD60C) ······························································· 60
7-6. Base Unit Section (BU-30BD60C) ···································· 61

8. ELECTRICAL PARTS LIST ······································· 62

4

Main unit

CD SYNC

qf

Deck A

wa

Deck B

ql

DIRECTION

wh

DISC 1 – 5

eh

DISC SKIP

eh

Disc tray

ws

DISPLAY

2

Display window

7

EDIT

wd

EFFECT

eg

ENTER

ed

FM MODE qs
FUNCTION

qa

GAME

wl

GAME INPUT AUDIO L/R jacks

qj

GAME INPUT VIDEO jack qj
GAME MIXING

wk

ILLUMINATION

4

MEMORY

qs

MIC-1/MIC-2 jacks

wf

MIC LEVEL

wg

PARTY

ea

PARTY MODE

es

SAMBA /ROCK
DISCO /BALLAD
TECHNO

P FILE

ef

PHONES jack

qg

PLAY MODE

wd

Power illuminator 5
PRESET EQ

es

SALSA/REGGAE/TANGO/
MOVIE/GAME

PUSH OPEN

ws

ALPHABETICAL ORDER

A – E F – O

P – Q

qjqkw; qlwaws

wk

wl

wd

wf

wg

wj
wh

qd
qf

qg

23 745 8690qa1

ejeh

ea es edefege;

qs

qh

Remote sensor

3

REPEAT

wd

SLEEP 9
SURROUND

e;

TIMER SELECT

8

TUNER ENTER

qs

TUNER/BAND

qs

TUNING +/–

qs

TUNING MODE

qs

VOLUME control

6

X-GROOVE

qk

R – Z

BUTTON DESCRIPTIONS

?/1 (power)

1

c/CLOCK SET

0

z REC

qf

x (stop)

ej

m/M (rewind/fast forward)

ej

NX (play/pause)

ej

h/H (play) qd

wj

x (stop) qd

wj

X (pause)

qd

.m/M> (rewind/fast
forward)

qd wj

./> (go back/go forward)

qh

M/m/</,

ed

A EJECTZ/Z B EJECT

w;

SECTION 1

GENERAL

HCD-XGR88

This section is extracted from
instruction manual.

5

HCD-XGR88

Remote control

This section is extracted from
instruction manual.

ALPHABETICAL ORDER

A – E

CLEAR 4
CLOCK/TIMER SELECT ws

CLOCK/TIMER SET 1
DISC SKIP w;
DISPLAY qa
EFFECT 9
ENTER 0

F – Z

FILE SELECT +/– qd
FUNCTION 3

PRESET +/– ql
SLEEP wa
SURROUND 5
TUNER/BAND qf
TUNING +/– qk
VOL +/– 6

ws

wa
w;
ql
qk

qj
qh

qg
qf

qd

BUTTON DESCRIPTIONS

?/1 (power) 2
m/M (rewind/fast forward)

qk

./> (go back/go forward)

ql

X (pause) qj
x (stop) qh

M/m/</, (cursor) qs

CD N (play) qg
TAPE AY (play) 8
TAPE BY (play) 7

1

2
3
4

5

6

7

8
9
q;

qa

qs

6

SECTION 2

)

DISASSEMBLY

• The equipment can be removed using the following procedure.

Set Case Front panel section Tape mechanism deck

Back panel, DC fan, MAIN board

CD mechanism deck (CDM37B-30BD60C)

HCD-XGR88

PANEL FL board, GAME board, TC-A board,
TUNER board, TC-B board

KEY board

PANEL VR board

HEADPHONE board, MIC VR board, MIC board

FRONT INPUT board

CD-L board, DOOR SW board, CD-R board

Base unit-1 (BU-30BD60C)

Disc table

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

2-1. CASE

8

Case

7

1

Three screws (CASE3 TP2)

Base unit-2 (BU-30BD60C) BD board

3

Five screws (BVTT 3x6)

4

Two screws (BVTP 3x8

6

5

2

Three screws (CASE3 TP2)

7

HCD-XGR88

)

)

2-2. FRONT PANEL SECTION

7

Screw (BVTP 3x8)

8

3

Connector (CN311)

Lugs

4

Connector (CN903)

5

Connector (CN722)

1

Flat type wire (CN371

2

Flat type wire (CN431)

9

Screw (BVTP 3x8)

qg

Front panel section

2-3. TAPE MECHANISM DECK

qa

Connector (B deck)

qd

Four screws (BVTP 3x8)

1

Flat type wire (13 core)

qs

Screw (BVTP 3x8)

qf

Claw

0

Lug

6

Connector (CN806)

2

Two screws (BVTP 2.6x8)

3

4

Front panel

Two screws (BVTP 2.6x8

5

Tape mechanism deck

8

2-4. PANEL FL BOARD, GAME BOARD, TC-A BOARD, TUNER BOARD, TC-B BOARD

)

Five screws (BVTP 2.6x8)

qa

7

(CN601)

qf

2

Bracket (TA)

ql

Two claws

1

Screw (BVTP 2.6x8)

qh Two

w;

claws

GAME board

ws

TC-A board

qs

Four screws

(BVTP 2.6x8)

5

(CN700)

qk

board

qj

qd

Four screws

(BVTP 2.6x8)

Connector

wd

Three claws

PANEL FL

HCD-XGR88

Flat type wire

8

Screw (BVTP 2.6x8)

9

Bracket (MAIN)

0

Four screws (BVTP 2.6x8)

Four screws (BVTP 2.6x8)

wf

TUNER board

qg

Four screws

(BVTP 2.6x8)

wa

Three claws

2-5. KEY BOARD

5

Three claws

Front panel

6

wg

Three claws

3

Screw (BVTP 2.6x8)

4

Bracket (TA)

1

wh

TC-B board

6

Connector (CN600)

Three screws (BVTP 2.6x8

2

OPERATION PANEL ASSY

7

KEY board

3

Flat type wire (CN801)

4

Five screws (BVTP 2.6x8)

Front panel

9

HCD-XGR88

)

)

2-6. HEADPHONE BOARD, MIC VR BOARD, MIC BOARD

7

MIC VR board

6

Knob (MIC)

5

Three screws (BVTP 2.6x8)

4

Connector (CN812)

8

Two screws (BVTP 2.6x8)

1 S

crew (BVTP 2.6x8)

2

Bracket HP PWB

0

MIC board

9 S

crew (BVTP 2.6x8

2-7. PANEL VR BOARD

Front panel

3

HEADPHONE board

3

Flat type wire (CN601)

6

5

Six screws (BVTP 2.6x8)

4

Flat type wire (CN801

7

P ANEL VR board

10

2

Nut (Supplied with S700)

1

Volume knob

Front panel

1

Five screws (BVTP 2.6x8)

4

FRONT INPUT board

Front panel

2

Bumper ASSY

J500

FRONT INPUT board

Front panel

3

)

2-8. FRONT INPUT BOARD

HCD-XGR88

2-9. CD-L BOARD, DOOR SW BOARD, CD-R BOARD

qd

(DIA.12)

8

Sub panel CD ASSY

qf

DOOR SW

board

Froating screw

qs

CD-L board

0

BRACKET (S/P) (L)

5

Five claws

6

3

Connector (CN700)

7

qk

CD-R board

Front panel

2

Four screws (BVTP 2.6x8)

1

Five screws (BVTP 2.6x8

4

Connector (CN600)

9

Screw (BVTP 2.6x8)

qa

Four screws

(BVTP 2.6x8)

qj

Four screws (BVTP 2.6x8)

qh

qg

Screw (BVTP 2.6x8)

BRACKET (S/P) (R)

11

HCD-XGR88

2-10. BACK PANEL, DC FAN, MAIN BOARD

7

Back panel

qa

Flat type wire

(CN401)

0

DC FAN

(M901)

6

1

Flat type wire (CN441)

2

Eight screws

(BVTP 3 X 8)

3

Two screws

(BVTP 3 X 8)

9

Two screws

(BVTP 3 X 8)

5

Four screws

(BVTP 3 X 8)

4

Three screws

(BVTP 3 X 8)

8

Connector (CN961)

qs

Connector (CN411)

qg

MAIN board

qd

Two screws

(BVTP 3 X 8)

qf

Two connectors

(CN901, 902)

12

m

2-11. CD MECHANISM DECK (CDM37B-30BD60C)

1

Flat type wire

(CN401)

4

Three screws

(BVTP 3 X 8)

7

2

Connector

(CN411)

6

Tw o screws (BVTP 3 X 8)

8

7

3

Four screws (BVTP 3 X 8)

Wire holder

5

Tw o screws

(BVTP 3 X 8)

HCD-XGR88

qa

CD mechanism deck

(CDM37B-30BD60C)

0

Five screws
(BVTP3 × 8)

9

Remove two cables fro

wire holder.

13

HCD-XGR88

)

2-12. BASE UNIT-1 (BU-30BD60C)

CD mechanism deck
(CDM37B-30BD60C)

3

Base unit
(BU-30BD60C)

2-13. BASE UNIT-2 (BU-30BD60C)

1

Two floating screws (DIA.12)

4

Two coil springs

(insulator)

2

Boss

1

BU fitting screw

6

Base unit (BU-30BD60C)

2

Two screws

(BVTP 2.6 X 8)

3

Two stoppers

(BU)

14

Holder (BU30) assy

5

Two coil
springs
(insulator

2-14. BD BOARD

e

5

BD board

BU-30BD60C

4

Flat type wire (CN102)

HCD-XGR88

3

Rivet

2-15. DISC TABLE

Note: When the disc table is installed, adjust the positions of roller cam
and mark B as shown in the figure, then set to the groove of disc
table.

A

1

Screw (BVTP 3

1

Remove the two solders.

2

Remove the two solders.

×

8)

3

Step screw

2

Bracket (BU)

4

Disc tabl

A

15

HCD-XGR88

B

SECTION 3

TEST MODE

[MC 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. Turn the power ON or set to the DEMO mode.

2. Press three buttons of x (TC-B) , TUNER ENTER , and \/1
simultaneously.

3. The set is reset, and displays “COLD RESET”, then becomes
DEMO mode.

[Change-over the AM Tuning Interval]

• The AM tuning interval can be changed over 9 kHz or 10 kHz.

Procedure:

1. Press the \/1 button to turn the power ON.

2. Select the function “TUNER”, and press the TUNER/BAND
button to select the BAND “AM”.

3. Press the \/1 button to turn the power OFF.

4. Press the ENTER and \/1 buttons simultaneously,
and the display on the fluorescent indicator tube changes to
“AM 9 K STEP” or “AM 10 K STEP”, and thus the tuning
interval is changed over.

[CD Ship Mode] (No 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 the \/1 button to turn the power ON.

2. Press the EDIT and

3. A message “LOCK” is displayed on the fluorescent indicator
tube, and the CD delivery mode is set.

[LED and Fluorescent Indicator Tube All Lit, Key Check
Mode]

Procedure:

1. Press three buttons of x (TC-B) , TUNER ENTER ,and
DISC 2 simultaneously.

2. LEDs and fluorescent indicator tube are all turned on.

3. Press the DISC 1 button, the MODE and DESTINATION are
displayed fluorescent indicator tube.

4. Each time the DISC 1 button is pressed, the MC/GC category
version is displayed in the following order.

5. Press the DISC 2 button, and the key check mode is acti-vated.

NR MC GC CD CDDM CDMA

6. In the key check mode, the fluorescent indicator tube displays
“K 0 J0 V0”. Each time a button is pressed, “K” value in-creases
to “K69”call the button is pressed.However, once a button is
pressed, it is no longer taken into account.
“V” value increases like 1, 2, 3 ... if turn the VOLUME dial
clockwise (“+” direction), or it decreases like 0, 9, 8 ... if turn
the VOLUME dial counterclockwise (“–” direction).

7. To release from this mode, press three buttons in the same
manner as step 1, or disconnect the power cord.

buttons simultaneously.

\/1

BDABDBSTTATMTC

CDM

[Sled Servo Mode] (CD service mode)

• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pick-up.

Procedure:

1. Select the function “CD”.

2. Press three buttons x (TC-B) , TUNER ENTER , and
DISC 5 simultaneously.

3. The Sled Servo mode is selected, if “CD” is blanking on the
fluorescent indicator tube.

4. With the CD in stop status, press M button in CD section to
move the pick-up to outside track, or m button to inside track.

5. To exit from this mode, press
OFF.

Note:

• Always move the pick-up to most inside track when exiting from
this mode. Otherwise, a disc will not be unloaded.

• Do not run the sled motor excessively, otherwise the gear can
be chipped.

[Change-over of FUNCTION Name]

• The FUNCTION name of external input terminal can be changed
over to VIDEO or MD. With the FUNCTION selected to “MD”,
about 5dB mute is applied to the input gain.

Procedure:

1. Press \/1 button to turn the power OFF.

2. Press
several seconds, and the power is turned on, the display of
fluorescent indicator tube changes to “MD” or “VIDEO”
instantaneously, and thus the FUNCTION is changed over.

[Aging Mode]

This mode can be used for operation check of tape deck section.
Tape deck section work in parallel.

• If an error occurred:
The aging operation stops and display then status.

• If no error occurs:
The aging operation continues repeatedly.

Procedure:

1. Load the tapes into the decks A and B respectively.

2. Press the FUNCTION button to select the function “CD”.

3. Press the PLAY MODE button to set the “ALL DISCS” mode,
and press the REPEAT button to “REPEAT” off.

4. Press three buttons of x (TC-B) , TUNER ENTER ,and
DISC 4 simultaneously.

5. The aging mode is activated, if the indicator of disc tray num­ber on the fluorescent indicator tube is blinking.

6. To release from the aging mode, press the \/1 button to turn
the power OFF and operate the cold reset. (Refer to the “MC
Cold Reset”)

1. Display at the Aging Mode

• Display operating state of tape deck section alternately.

• If an error occurred, stop display.

button together with FUNCTION button for

\/1

button turn to the power

\/1

16

HCD-XGR88

2. Tape Deck Section

• The sequence during the aging mode is following as below.

• If an error occurred, stop display that step.

Aging mode sequence (Tape deck section):

Rewind the tape A

“TAPE A AG-1”

Shut off

FWD the tape A

“TAPE A AG-2”

2 minutes

Fast forward the tape A

“TAPE A AG-3”

Shut off or 20 seconds

RVS the tape A

“TAPE A AG-4”

2 minutes

Rewind the tape A

“TAPE A AG-5”

Shut off

3. CD Section

• The sequence during the aging mode is following as below.

• If an error occurred, stop display that step.

Aging mode sequence (CD section):

Tray Turn

DISC 1

chucking

TOC Read

Track 1 Play

2 seconds

Last Track Play

2 seconds

FWD the tape B

“TAPE B AG-2”

2 minutes

Fast forward the tape B

“TAPE B AG-3”

Shut off or 20 seconds

RVS the tape B

“TAPE B AG-4”

2 minutes

Rewind the tape B

“TAPE B AG-5”

Shut off

Note: “TAPE * AG- * ” is display of each step.

Tray Tun

DISC 4

Chucking

TOC Read

Track 1 Play

2 seconds

Last Track play

[VACS ON/OFF]

• The volume control by VACS is turned ON/OFF.

Procedure:

1. Press the \/1 button to turn the power ON.

2. Press the PLAY MODE and \/1 buttons simultaneously.

3. The reaction display appears when switcing ON/OFF.

17

HCD-XGR88

SECTION 4

MECHANICAL ADJUSTMENTS

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

2.9~6.9 mN•m

FWD (30 to 70 g•cm)

CQ-102C

FWD

back tension (2 to 6 g•cm)

FF/REW CQ-201B (80 to 170 g•cm)

(0.42 – 0.97 oz•inch)

0.19~0.59 mN•m

(0.03 – 0.08 oz•inch)

7.8~16.7 mN•m

(1.11 – 2.36 oz • inch)

SECTION 5

ELECTRICAL ADJUSTMENTS

DECK SECTION 0 dB = 0.775 V

Precaution

1. Demagnetize the record/playback head with a head demagne­tizer.

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the
parts adjust.

4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit
adjustment should be completed before performing recording
circuit adjustment.)

6. The adjustments should be performed for both L-CH and R-CH.

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

8. Set to the DOLBY NR OFF.

9. Set to the test mode.
(1) Press the \/1 button to turn the power ON.
(2) Select the function “TAPE A or B”.
(3) Press the button of x (TC-B) , ENTER ,and DISC 3

simultaneously, to set the tape deck test mode
and displays “TEST MODE” on the fluorescent indicator
tube.

(4) To release from the test mode, press the \/1 button.

• Test Tape

Tape Signal Used for

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

WS-48B 3 kHz, 0 dB Tape Speed Adjustment

18

HCD-XGR88

)

Record/Playback Head Azimuth Adjustment
DECK A DECK B

Note: Perform this adjustments for both decks

Procedure:

1. Mode: Playback (FWD)

test tape
P-4-A100
(10 kHz, – 10 dB)

MAIN board
MD (VIDEO) OUT jack (J701
L-CH, R-CH

level meter

set

+

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

within
1dB

L-CH
peak

Adjustment Location: Playback Head (Deck A).

Record/Playback/Erase Head (Deck B).

forward

reverse

R-CH

Screw
position

peak

L-CH
peak

R-CH
peak

Screw
position

3. Mode: Playback

MAIN board
test tape
P-4-A100
(10 kHz, – 10 dB)

L-CH

set

R-CH

in phase 45°90°135°180

MD (VIDEO) OUT jack (J701)

L-CH

R-CH

waveform of oscilloscope

good

oscilloscope

wrong

H

V

°

4. Repeat step 1 to 3 in playback (REV) mode.

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

19

HCD-XGR88

e

)

CD SECTION

Note :

1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.

2. Use LUV-P01 (4-999-032-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10M 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

BD board

TP(FE)
TP(DVC)

Procedure :

1. Connect oscilloscope to TP (FE).

2. Connect between TP (FE) and TP (DVC ( 1.65 V) by lead
wire.

3. Press the \/1 button to turn the power ON.

4. Load a disc (LUV-P01) and actuate the focus search. (In conse­quence of open and close the disc tray, actuate the focus search)

5. Confirm that the oscilloscope waveform (S-curve) is symmetri­cal between A and B. And confirm peak to peak level within 2
±0.5 Vp-p.

S-curve waveform

symmetry

A

within 4

±

1Vp-p

B

Note: Clear RF signal waveform means that the shape “◊” can be

clearly distinguished at the center of the waveform.

VOLT/DIV : 200mV
TIME/DIV : 500ns

level : 1.45

±

0.3Vp-p

E-F Balance (1 Track jump) Check

oscilloscop

BD board

TP(TE)
TP(DVC)

Procedure:

1. Connect oscilloscope to TP (TE) and TP (DVC) board.

2. Press the \/1 button to turn the power ON.

3. Load a disc (LUV-P01) and playback the number nine track.

4. Press the bB button. (Becomes the 1track jump mode.)

5. Confirm that the level B and A (DC voltage) on the oscillo­scope waveform.

center of
waveform

B

0V

B=1.3 ± 0.6Vp-p

Specified level: × 100=less than – 22%

A
B

symmetry

A (DC voltage

6. After check, remove the lead wire connected in step 2.
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.

RF Level Check

oscilloscope

BD board

TP(RFDC)
TP(RFAC)

Procedure :

1. Connect oscilloscope to TP2 (RFDC) and TP1 (RFAC).

2. Press the \/1 button to turn the power ON.

3. Load a disc (LUV-P01) and playback.

4. Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.

6. Adjust RV101 so that A (DC voltage) becomes 0.

Checking Location:

[BD BOARD]

DVC

RFAC

FE

SE
TE

RFDC

RV101

20

Five screws (BVTT 3x6)

6-1. CIRCUIT BOARD LOCATION

HCD-XGR88

SECTION 6
DIAGRAMS

GAME board

TC-A board

CD-L board

TRANS board

PANEL FL board

FRONT INPUT board

SUB TRANS board

TUNER PACK (FM/AM TUNER UNIT)

TC-B board

HEADPHONE board

CD-R board

SUB AMP board

MAIN board

PA board

TUNER board

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in Ω and 1/
specified.

• f : internal component.

2

•

• 5 : fusible resistor.

• C : panel designation.

• A : B+ Line.

• B : B– Line.

• H : adjustment for repair.

•Voltages and waveforms are dc with respect to ground

•Voltages are taken with a VOM (Input impedance 10 MΩ).

•Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

: nonflammable resistor.

Note:

The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.

under no-signal conditions.
BD board section
no mark: CD PLAY
Other board section
no mark: TUNER (FM/AM)
( ): TAPE PLAY
< >: TAPE REC
[ ]: CD PLAY

Voltage variations may be noted due to normal produc­tion tolerances.

Voltage variations may be noted due to normal produc­tion tolerances.

F : TUNER (FM/AM)
E : TAPE PALY (DECK A)
d : TAPE PALY (DECK B)
G : RECORD
J : CD PALY (ANALOG OUT)
c : CD PALY (DIGITAL OUT)
N : MIC INPUT

4

W or less unless otherwise

Note on Printed Wiring Boards:

• X : parts extracted from the component side.

• : Pattern from the side which enables seeing.

(The other layers´ Patterns are not indicated.)

• Indication of transistor.

C

B

B

B

Q

E

Q

CE

These are omitted.

These are omitted.

Q

CE

These are omitted.

KEY board

PANEL VR board

MIC board

MIC VR board

DOOR SW board

MOTOR board

SENSOR board

BD board

LED board

21

21

HCD-XGR88

6-2. BLOCK DIAGRAMS

– CD SERVO SECTION –

CD D+5V

A

B

C

D

F

E

OPTICAL PICK-UP BLOCK

(A-MAX.3)

LASER DIODE

PD

PD1

PD2

I-V AMP

I5-10

LD

M101

SPINDLE

MOTOR

M102
SLED

MOTOR

I1-6

LD

PD

M

M

FOCUS/TRACKING ERROR AMP

A

6

B

7

C

8

D

9

F

11

F I-V AMP

E

10

E I-V AMP

LD

DRIVE

Q101

FOCUS/TRACKING COIL DRIVE,

SPINDLE/SLED MOTOR DRIVE

1

IC102

CH4OUTF

15

16

17

18

CH4OUTR

CH3OUTF

CH3OUTR

MOTOR

DRIVE

MOTOR

DRIVE

FILTER

RF AMP,

IC103

RF

SUMMING

AMP

∑

A-D

FOCUS

ERROR AMP

TRACKING

ERROR AMP

LD

APC LD

AMP

CH4SIN

CH3FIN

CH3RIN

APC PD

25

24

23

AMP

RF EQ

AMP

DC

AMP

RFAC

RFDCO

RFDCI

FEI

TE

SW

PD

15

28
29

FE

16
17

18

12

2

40

SE

43

39

41

FE

TE

RFDC

A/D

CONVERTER

PWM3

PWM1

PWM2

BUFFER

Q451-454

RFAC

51

ASYI

49

ASYO

48

DIGITAL

CLV

DIGITAL SERVO

PROCESSOR

IC101 (2/2)

ASYMMETRY
CORRECTION

MDP

26

3

XRST

SUBCODE

PROCESSOR

XLON

14 5 6

54 56

FILO

XLAT

DATA

X-LAT

CD-DATA

53

PCO

CLTV

DIGITAL

PLL

CPU INTERFACE

CLOK

SENS

8

7

CD-CLK

55

DIGITAL SIGNAL PROCESSOR,

DIGITAL FILTER, D/A CONVERTER

IC101 (1/2)

FILI

SERVO AUTO

EFM

DEMODULATOR

SEQUENCER

SQSO

SQCK

SCOR

20

1 2

16K

RAM

CD-DATA

INTERNAL BUS

ERROR

CORRECTOR

SERVO

INTERFACE

SSTP

SCLK

COUT

9 21

27

NCNC NC NC NC

When the optical pick-up

ON :

is inner position.

33
32

19

34

CD-CLK

37

X-LAT

36
35

40

PWM1

28

PWM2

26

PWM3

24

D/A

INTERFACE

EMPH

WFCK

64 15

(LIMIT)

SQ-CLK
SQ-DATA

SCOR

SENS

CD-CLK
XLT
CD-DATA

HOLD

BU-PWM1
BU-PWM2
BU-PWM3

GFS

18

S101

PCMD

62

BCK

63

LRCK

61

C2PO

19

SERIAL

IN

INTERFACE

DIGITAL

OUT

60

CD-MUTE

TBL-SENS

BU UP/DW SW

LED-DISK

NC
NC
NC
NC

DOUT

DIGITAL

FILTER,

NOISE SHAPER

TO MIRR/DFCT/
FOK DETECTOR

5

49

48

(UP SWITCH)

47

DISC TABLE

SENSOR

IC202

S201

LED DRIVE

Q201

PWM

&

INTEGRATOR

AOUT1

AOUT2

(DISC No.)

D201

70

77

CLOCK

GENERATOR

AIN1

71

AIN2

76

BUFFER

TIMING

LOGIC

LOUT1

LOUT2

XTAI

XTAO

72

75

R-CH

MUTE

Q401

66

67

X101

16.9344MHz

CD-L

(Page 24)

CD DIGITALOUT

OPTICAL

OPTICAL

TRANSCEIVER

A

IC451

Q809,810

LEVEL SHIFT

TRACKING

COIL

FOCUS

COIL

SFDR

28

SRDR

29

T+

T-

F+

F-

12

11

14

13

CH2OUTF

CH2OUTR

CH1OUTF

CH1OUTR

COIL

DRIVE

COIL

DRIVE

CH2FIN

CH2RIN

CH1FIN

CH1RIN

MUTE

5

6

2

3

20

TFDR

30

TRDR

31

FFDR

32

FRDR

33

PWM GENERATOR

FOCUS/TRACKING/SLED

SERVO DSP

FOCUS/TRACKING/SLED

MIRR/DFCT/

FOK

DETECTOR

TO SERVO INTERFACE

FOK

MIRR

DFCT

24

NC
NC

22

NC

23

22

22

SYSTEM CONTROLLER

(CD MECHANISM CONTROL)

IC501 (1/4)

43

XRST

MTR-CTRL1

MTR-CTR2

TABLE MOTOR DRIVER

IC201

Q412

44

45

Q411

IN2

1

MOTOR

IN1

9

DRIVE

OUT2

OUT1

3

7

M

M201

(TABLE)

• R-ch is omitted due to same as L-ch.

• SIGNAL PATH

: CD PLAY (ANALOG OUT)

: CD PLAY (DIGITAL OUT)

–TUNER/TAPE DECK SECTION –

HCD-XGR88

PB

HEAD

REC/PB

HEAD

ERASE

HEAD

DECK-A

DECK-B

R-CH

R-CH

R-CH

T331

Q323,325

BIAS OSC

Q331

SWITCH

Q321,322,327

TC A+10

Q334,335

32

34

21

A

B

REC-OUT

R-CH

70

120

DECK A/B SELECT

PB/REC EQUALIZER AMP

IC301

+

28 27 26

A/B

NORM/HIGH

13 12 11 15 14

HPF

Q341,342,344

ALC ON/OFF

REC MUTE ON/OFF

AMS DETECT

PB-OUT1

ALC1

MUTE ON/OFF

Q343

23

SYSTEM CONTROL

(CD MECHANISM CONTROL)

IC501(2/4)

53

AMS-IN

58

TC-MUTE

61

REC-MUTE

68

ALC

PB-L

REC-L

B

C

(Page 24)

(Page 24)

FM

75Ω

AM

TC BLOCK

REC(REW)
REC(FWD)

B-PHOTO
A-PHOTO

B-MODE
A-MODE

B-HALF
A-HALF

A-SOL

B-SOL

CAP M+

CN371

ANTENNA

FM/AM TUNER UNIT

ST-LOUT

FM ANT

FM ANT

AM ANT

AM ANT

ST-ROUT

ST-MUTE

STEREO

TUNED

OUT(ST-DIN)
IN(ST-DOUT)

ST-CLK

ST-CE

R-CH

ST-MUTE
STEREO
TUNED

ST-DIN
ST-DOUT
ST-CLK
ST-CE

ST-L

D

(Page 24)

Q383,384

A TRIG

DRIVE

Q381,382

B TRIG

DRIVE

Q385,386

CAP MOTOR

DRIVE

67

PB-A/B
BIAS

65

REC-B

50

REC-A

46

90

B-SHUT
A-SHUT

89
57

B-PLAY SW

56

A-PLAY SW
B-HALF

91

A-HALF

70
69

TC-RELAY

51

A-TRIG

52

B-TRIG

CAPM-CTRL

55

ST-MUTE

21

STEREO

2

TUNED

3

ST-DIN

25

ST-DOUT

23
27

ST-CLK
ST-CE

22

• R-ch is omitted due to same as L-ch.

• SIGNAL PATH

: TUNER (FM/AM)

: PLAYBACK (DECK A)

: PLAYBACK (DECK B)

: RECORD

23

23

HCD-XGR88

– MAIN SECTION –

J802

MIC1

MIC AMP

IC850 (2/2)

MIC OUT

IC422 (1/2)

6 7

+

MIX AMP

J801

MIC2

A+9V

A

B

D

+9V

L

R

L

R

L

R

FRONT

INPUT
VIDEO

VIDEO OUT

CD-L

PB-L

ST-L

J701 (1/2)

J500 (2/2)

VREF
Q611

R-CH

R-CH

R-CH

J500 (1/2)

J721

PHONO

EQ AMP

IC601

(Page 22)

(Page 23)

(Page 23)

PHONO

IN

MD IN

FRONT
INPUT
AUDIO

• R-ch is omitted due to same as L-ch.

• SIGNAL PATH
: TUNER (FM/AM)

: CD PLAY
: TAPE PLAY
: RECORD
: MIC INPUT

+

VREF
Q884

VC

Q181 Q182

AMP

IC422 (2/2)

MIC AMP

IC850 (1/2)

VC

FUNCTION SELECT

SWITCH

IC181

X0

12

X1

14

X2

15

X3

11

AB

10 9

1

32

X

MUTE

Q471

22

24

13

PWML+

PWML–

28 27

RV801

MIC LEVEL

D462

20

MUTEOL

X401

8.19MHz

D461

TSTB

MCK

MSD

MLAB

MEMP

TEMPO

XOSXIS

X501

32.768kHz

X502

16MHz

4

6

7

8

9

10

RHYTHM

PHRASE
PLAYER

IC461

INPUT SELECT SWITCH,

GRAPHIC EQUALIZER CONTROL,

ELECTRICAL VOLUME

IC111

INC1

5

INB1

4
3
6

7

INPUT

INA1

SELECT

IND1

SWITCH

INEX1

R-CH

SYSTEM CONTROLLER

(CD MECHANISM CONTROL)

IC501 (3/4)

XC-OUT

11

XC-IN

10

13

X-OUT

X-IN

15

AU-SEL0

71

AU-SEL1

72

66

ML-MUTE

ML-RESET

60

7

PARTY-CLK

6

PARTY-DATA

59

ML-WR

54

ML-BUSY2

42

PARTY-TEMPO

TEMP DET

AUDIO-OUT

LINE-MUTE

STK-MUTE

FRONT-RELAY

+

+

EQIC-DAT
EQIC-CLK

HP-MUTE

PROTECT

HP-IN

80
81

97

1

Q802,803

LEVEL SHIFT

82

83
86

88

87

95

2

8

MIC

RECB1

SURROUND OR

DPL BUFFER

R-CH

MUTE

Q114

REC-L

R-CH

+

COMMAND

(Page 25)

E

VL
IN1

VOLUME

CONTROL

CPU

INTERFACE

DATA

CLK

22 1621

BB-A1

17

C
A
B

C
A
B

+

R-CH

MID/
BASS &
TREBLE

L+R

F OUT2

14 15

19

SPEANA

SWOUT

BB-B1

OUT1

Q115

NC

24

18

R-CH

D803

Q805,806

LEVEL SHIFT

MUTE

Q701

+

Q166,167

R-CH

R-CH

–1

–2

R-CH

FAN MOTOR

B+

FAN MOTOR

DRIVE

Q961, 962

TWEETER & WOOFER

IMPEDANCE

USE 6 – 16Ω

J701 (2/2)

TM401

+

–

+

C

M901
(FAN)

M

(Page 23)

L

MD OUT

R

L

R

–

POWER AMP

18 11

IC801

12

STANDBY SWITCH

Q803, 804, 834

POWER AMP

14 9

IC101

R-CH

+

R-CH

TH831

TEMPERATURE

DETECT SWITCH

Q842, 843

TEMPERATURE

DETECT SWITCH

Q831, 832

OVER LOAD

DETECT

Q801, 851

R-CH

OVER LOAD

DETECT

Q101, 151

D401

D410

PROTECTOR

IC912

OCP

1

VP

2

OUT

3

DBFB

DELAY

Q833

(Page 25)

F

AC DET

4

CT

FRONT SPEAKER PROTECT

Q923

RELAY DRIVE

Q401, 402

PROTECT SWITCH

Q431

R-CH

R-CH

MUTE

Q805,855

RY401

J891

PHONES

TM402

SUPER WOOFER

IMPEDANCE

USE 6 – 16Ω

+

–

+

L

R

–

24

24

RY402