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MICROFILM
HCD-GRX8/R800/
RX88/RX99
AEP Model
UK Model
HCD-RX88/RX99
E Model
HCD-GRX8/R800
Australian Model
HCD-GRX8
SPECIFICATIONS
Photo: HCD-GRX8
SERVICE MANUAL
COMPACT DISC DECK RECEIVER
-- Continued on next page --
Model Name Using Similar Mechanism
HCD-H991AV
CD Mechanism Type
CDM38L-5BD29AL/
CDM38LH-5BD29AL
Base Unit Type
BU-5BD29AL
Optical Pick-up Type
KSS-213D/Q-NP
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
TCM-230AWR1/230PWR1
CD
SECTION
TAPE
DECK
SECTION
HCD-GRX8/R800/RX88/RX99 is the
tuner, deck, CD and amplifier section in
MHC-GRX8/R800/RX88/RX99.


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SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
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 ir on 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.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER PROD-
UCT MARKING is located on
the rear exterior.
This caution
label is located
inside the unit.


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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
repain 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 pick-
up block. Therefore, when checking the laser diode emission, ob-
serve 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 waveform is output three times.
4-996-817-0
4-996-817-1
4-996-817-2
4-996-817-3
4-996-817-4
4-996-817-5
4-996-817-6
4-996-818-0
4-996-818-1
4-996-818-2
4-996-818-3
4-996-818-4
4-996-818-5
4-997-818-8
4-997-818-9
4-997-720-0
4-997-720-1
4-997-720-2
4-997-720-3
4-997-720-4
4-997-720-5
4-997-720-6
4-997-720-8
4-997-720-9
RX99: AEP, UK, G
RX99: EE, CIS
RX99: AEP, UK, G
RX99: EE, CIS
RX88
RX88
GRX8: TH, EA4
GRX8: E2, E3
GRX8: SP, MY
GRX8: TW
GRX8: HK
GRX8: AUS
GRX8: MX
R800: MX
R800: AR
GRX8: E2, E3
GRX8: SP, MY
GRX8: TW
GRX8: HK
GRX8: AUS
GRX8: MX
GRX8: EA3
R800: MX
R800: AR
PARTS No.
MODEL
PRODUCT
COUNTRY
MALAYSIA
MALAYSIA
INDONESIA
INDONESIA
MALAYSIA
INDONESIA
THAILAND
INDONESIA
INDONESIA
INDONESIA
INDONESIA
INDONESIA
INDONESIA
INDONESIA
INDONESIA
MALAYSIA
MALAYSIA
MALAYSIA
MALAYSIA
MALAYSIA
MALAYSIA
MALAYSIA
MALAYSIA
MALAYSIA
MODEL IDENTIFICATION
-- BACK PANEL --
· Abbreviation
G
: German model
EE
: East European model
MX
: Mexican model
HK
: Hong Kong model
SP
: Singapore model
MY
: Malaysia model
TW
: Taiwan model
AUS : Australian model
AR
: Argentine model
TH
: Thailand model
EA3 : Saudi arabia model
EA4 : Israel model
E2
: Without SW tuner E model.
E3
: With SW tuner E model.
Parts No.


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TABLE OF CONTENTS
8. EXPLODED VIEWS
8-1. Case Section ........................................................................ 98
8-2. Chassis Section ................................................................. 100
8-3. Front Panel Section ........................................................... 101
8-4. CD Mechanism Deck Section-1 (CDM38L-5BD29AL) .. 102
8-5. CD Mechanism Deck Section-2 (CDM38L-5BD29AL) .. 103
8-6. Base Unit Section (BU-5BD29AL) .................................. 104
8-7. TC Mechanism Section 1 (TCM230AWR1) .................... 105
8-8. TC Mechanism Section 2 (TCM230AWR2) .................... 106
9. ELECTRICAL PARTS LIST ...................................... 107
1. SERVICING NOTE .......................................................... 5
2. GENERAL .......................................................................... 6
3. DISASSEMBLY
3-1. Loading Panel ....................................................................... 8
3-2. Front Panel ........................................................................... 8
3-3. Cassette Mechanism Deck .................................................... 9
3-4. Panel Board and Cont Com Board ........................................ 9
3-5. Disc Tray ........................................................................... 10
4. SERVICE MODE ............................................................ 11
5. MECHANICAL ADJUSTMENTS .......................... 14
6. ELECTRICAL ADJUSTMENTS ............................... 14
7. DIAGRAMS
7-1. Circuit Boards Location ...................................................... 20
7-2. Brock Diagrams
· Tuner Section (AEP, UK, German model) ....................... 21
· Tuner Section (East European, CIS model) ..................... 23
· CD Section ....................................................................... 25
· Deck Section .................................................................... 27
· Main Section .................................................................... 29
· Power Section .................................................................. 31
· Display Section ................................................................ 33
7-3. Printed Wiring Board -- CD Section -- ............................. 37
7-4. Schematic Diagram -- CD Section -- ............................... 39
7-5. Schematic Diagram
--Tuner (AEP, UK, German model) Section -- ................. 41
7-6. Printed Wiring Board
--Tuner (AEP, UK, German model) Section -- ................. 43
7-7. Printed Wiring Board
--Tuner (East European, CIS model) Section -- ............... 44
7-8. Schematic Diagram
--Tuner (East European, CIS model) Section -- ............... 45
7-9. Schematic Diagram -- Deck Section -- ............................. 47
7-10. Printed Wiring Board -- Deck Section -- ....................... 49
7-11. Printed Wiring Board -- Main Section -- ....................... 51
7-12. Schematic Diagram -- Main (1/4) Section -- ................. 53
7-13. Schematic Diagram -- Main (2/4) Section -- ................. 55
7-14. Schematic Diagram -- Main (3/4) Section -- ................. 57
7-15. Schematic Diagram -- Main (4/4) Section -- ................. 59
7-16. Printed Wiring Board -- Mic/HP Section -- ................... 61
7-17. Schematic Diagram -- Mic/HP Section -- ...................... 62
7-18. Printed Wiring Board -- Power Section -- ..................... 63
7-19. Schematic Diagram -- Power Section -- ........................ 65
7-20. Schematic Diagram -- Transformer Section -- ............... 67
7-21. Printed Wiring Board -- Transformer Section -- ............ 69
7-22. Printed Wiring Board -- Leaf SW Section -- ................. 70
7-23. Schematic Diagram -- Leaf SW Section -- .................... 70
7-24. Printed Wiring Board -- Display Section -- ................... 71
7-25. Schematic Diagram -- Display Section -- ...................... 73
7-26. Schematic Diagram -- Panel Section -- ......................... 75
7-27. Printed Wiring Board -- Panel Section -- ....................... 77
7-28. Schematic Diagram -- CD Motor Section -- .................. 79
7-29. Printed Wiring Board -- CD Motor Section -- ............... 81
7-30. IC Block Diagrams ........................................................... 83
7-31. IC Pin Functions ............................................................... 88


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SECTION 1
SERVICING NOTE
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH
TURNS OFF
1 Remove the Case.
3 pull-out the disc tray.
2 Turn the cam to the
direction of arrow.
Note for Installation (ROTARY ENCODER)
BU cam
Groove
Section A
Note:When attaching the Base unit, Insert the
section A into the groove of BU cam.
Note:When attaching the BU cam,
engage the Rotary encoder
switch as shown in the figure.