DOWNLOAD Sony HCD-GRX90AV / HCD-RXD10AV / MHC-GRX90AV Service Manual ↓ Size: 7.98 MB | Pages: 74 in PDF or view online for FREE

– 1 –

US Model

Canadian Model

AEP Model

UK Model

HCD-RXD10AV

E Model

Australian Model

HCD-GRX90AV

Photo: HCD-RXD10AV (E model)

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

HCD-GRX90AV/RXD10AV is the
tuner, deck, CD and amplifier section
in MHC-GRX90AV/RXD10AV.

– 2 –

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

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be

 damaged by heat.

• 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.

– 3 –

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.

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.

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

π GRX90AV: E2, AR

INDONESIA

4-214-455-1

π GRX90AV: EA

INDONESIA

4-214-455-2

π GRX90AV: SP

INDONESIA

4-214-455-5

π GRX90AV: MX

INDONESIA

4-214-455-6

π GRX90AV: AUS

INDONESIA

4-214-455-7

π RXD10AV: AEP, G, UK, CIS INDONESIA

4-214-455-9

π RXD10AV: US

INDONESIA

4-215-171-0

π RXD10AV: CND

INDONESIA

4-215-171-1

π GRX90AV: E3

INDONESIA

4-215-171-2

π GRX90AV: TH

THAI

4-215-171-3

π RXD10AV: AEP

THAI

• 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

!

!

!

– 4 –

.......................................................... 5

.......................................................................... 6

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

............................................................ 11

..........................

14

............................... 14

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

8-1. 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

........................................ 85

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.

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)

0.15

µ

F

To Exposed Metal
Parts on Set

1.5k

Ω

AC
voltmeter
(0.75V)

Earth Ground