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HCD-GRX90AV/RXD10AV
US Model
Canadian Model
AEP Model
UK Model
HCD-RXD10AV
E Model
Australian Model
HCD-GRX90AV
SPECIFICATIONS
Photo: HCD-RXD10AV (E model)
COMPACT DISC DECK RECEIVER
-- Continued on next page --
Model Name Using Similar Mechanism HCD-GRX80/RXD8/RXD8S
CD Mechanism Type
CDM38LH-5BD32L
Base Unit Type
BU-5BD32L
Optical Pick-up Type
KSS-213D/Q-N
Model Name Using Similar Mechanism HCD-GRX8/R800/RX88/RX99
Tape Transport Mechanism Type
TCM-230AWR2/230PWR2
CD
SECTION
TAPE DECK
SECTION
MICROFILM
SERVICE MANUAL
HCD-GRX90AV/RXD10AV is the
tuner, deck, CD and amplifier section
in MHC-GRX90AV/RXD10AV.


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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 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.
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
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 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 four times.
4-214-455-0
GRX90AV: E2, AR
INDONESIA
4-214-455-1
GRX90AV: EA
INDONESIA
4-214-455-2
GRX90AV: SP
INDONESIA
4-214-455-5
GRX90AV: MX
INDONESIA
4-214-455-6
GRX90AV: AUS
INDONESIA
4-214-455-7
RXD10AV: AEP, G, UK, CIS INDONESIA
4-214-455-9
RXD10AV: US
INDONESIA
4-215-171-0
RXD10AV: CND
INDONESIA
4-215-171-1
GRX90AV: E3
INDONESIA
4-215-171-2
GRX90AV: TH
THAI
4-215-171-3
RXD10AV: AEP
THAI
MODEL IDENTIFICATION
-- BACK PANEL --
· Abbreviation
CND : Canadian model
G
: German model
EA
: Saudi Arabia model
MX
: Mexican model
E2
: Without SW tuner E model
E3
: With SW tuner E model
SP
: Singapore model
AUS : Australian model
AR
: Argentine model
TH
: Thai model
Parts No.
PARTS No.
MODEL
PRODUCT
COUNTRY
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE
!SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS
SONT DONNÉS DANS CE MANUEL OU DANS LES
SUPPLÉMENTS PUBLIÉS PAR SONY.


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TABLE OF CONTENTS
1. SERVICING NOTE .......................................................... 5
2. GENERAL .......................................................................... 6
3. DISASSEMBLY
3-1. Loading Panel ....................................................................... 8
3-2. Front Panel ............................................................................ 8
3-3. Cassette Lid and Tape Mechanism ........................................ 9
3-4. CD SW Board and Panel 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 ...................................................... 18
7-2. Block Diagrams
· CD Section ....................................................................... 19
· Deck Section .................................................................... 21
· Main Section .................................................................... 23
· Main Power/Sub Power Section ...................................... 25
· Display Section ................................................................ 27
7-3. Printed Wiring Board ­ BD (CD) Section ­ ....................... 31
7-4. Schematic Diagram ­ BD (CD) Section ­ .......................... 33
7-5. Printed Wiring Board ­ Main Section ­ .............................. 35
7-6. Schematic Diagram ­ Main (1/4) Section ­ ........................ 37
7-7. Schematic Diagram ­ Main (2/4) Section ­ ........................ 39
7-8. Schematic Diagram ­ Main (3/4) Section ­ ........................ 41
7-9. Schematic Diagram ­ Main (4/4) Section ­ ........................ 43
7-10. Printed Wiring Board ­ Leaf SW Section ­ ..................... 45
7-11. Schematic Diagram ­ Leaf SW Section ­ ........................ 45
7-12. Schematic Diagram ­ Deck Section ­ .............................. 47
7-13. Printed Wiring Board ­ Deck Section ­ ........................... 49
7-14. Schematic Diagram ­ Front Panel Section ­ .................... 51
7-15. Printed Wiring Board ­ Front Panel Section ­ ................. 53
7-16. Printed Wiring Board ­ Panel Section ­ ........................... 55
7-17. Schematic Diagram ­ Panel (1/2) Section ­ ..................... 57
7-18. Schematic Diagram ­ Panel (2/2) Section ­ ..................... 59
7-19. Schematic Diagram ­ Surround Section ­ ....................... 61
7-20. Printed Wiring Board ­ Surround Section ­ ..................... 62
7-21. Schematic Diagram ­ CD Motor Section ­ ...................... 63
7-22. Printed Wiring Board ­ CD Motor Section ­ ................... 65
7-23. Schematic Diagram ­ Trans Section ­ ............................. 67
7-24. Schematic Diagram ­ Sub Trans Section ­ ...................... 69
7-25. Printed Wiring Board ­ Trans Section ­ ........................... 71
7-26. Printed Wiring Board ­ Sub Trans Section ­ ................... 72
7-27. IC Block Diagrams ........................................................... 73
7-28. IC Pin Functions ............................................................... 74
8. EXPLODED VIEWS
8-1. Case Section ........................................................................ 77
8-2. Chassis Section ................................................................... 78
8-3. Front Panel Section ............................................................. 79
8-4. CD Mechanism Deck Section-1 (CDM38LH-5BD32L) .... 80
8-5. CD Mechanism Deck Section-2 (CDM38LH-5BD32L) .... 81
8-6. Base Unit Section (BU-5BD32L) ....................................... 82
8-7. TC Mechanism Section-1 (TCM230AWR2/230PWR2) .... 83
8-8. TC Mechanism Section-2 (TCM230AWR2/230PWR2) .... 84
9. ELECTRICAL PARTS LIST ........................................ 85
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, "metallized" knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers' instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The "limit" indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
0.15
µF
To Exposed Metal
Parts on Set
1.5k
AC
voltmeter
(0.75V)
Earth Ground


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CD-TEXT
This unit is provided with a simple CD-TEXT display function.
The CD-TEXT contents of 20 tracks are displayed on the fluorescent display tube.
Since the function is simple, some special characters may not be displayed, or may be displayed as other characters.
SECTION 1
SERVICING NOTE
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH
TURNS OFF
Note for Installation (ROTARY ENCODER)
1 Remove the Case.
3 Pull-out the disc tray.
2 Turn the cam to the direction
of arrow.
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.