HCD-VX90AV, MHC-VX90AV - Sony Audio Service Manual (repair manual)

– 1 –

E Model

Model Name Using Similar Mechanism HCD-GRX80/RXD8/RXD8S

CD Mechanism Type

CDM38L-5BD34L

Base Unit Type

BU-5BD34L

Optical Pick-up Type

KSS-213D/Q-NP

Model Name Using Similar Mechanism HCD-GRX80/RXD8/RXD8S

Tape Transport Mechanism Type

TCM-230AWR2/230PWR2

CD

SECTION

TAPE DECK

SECTION

MICROFILM

HCD-VX90AV is the tuner, deck, CD and
amplifier section in MHC-VX90AV.

– 2 –

4-215-642-1

π EA, MY, SP model

4-215-642-3

π IA model

4-215-642-4

π E model

4-215-642-5

π TH model

• Abbreviation

SP

: Singapore model

MY

: Malaysia model

IA

: Indonesia model

TH

: Thai model

EA

: Saudi arabia model

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.

Parts No.

PARTS No.

MODEL

– 3 –

.......................................................... 4

.......................................................................... 7

3-1. Loading Panel ....................................................................... 9
3-2. Front Panel ............................................................................ 9
3-3. Cassette Lid and Tape Mechanism ...................................... 10
3-4. CD SW Board and Panel Board .......................................... 10
3-5. Disc Tray ............................................................................. 11

..................................................................... 12

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

13

............................... 13

7-1. Circuit Boards Location ...................................................... 18
7-2. Block Diagrams

• CD Section ....................................................................... 19
• Video Section ................................................................... 21
• Deck Section .................................................................... 23
• Main Section .................................................................... 25
• Power Section .................................................................. 27
• Display Section ................................................................ 29

7-3. Printed Wiring Board – BD Section – ................................. 33
7-4. Schematic Diagram – BD Section – ................................... 35
7-5. Schematic Diagram – Deck Section – ................................ 37
7-6. Printed Wiring Board – Deck Section – .............................. 39
7-7. Printed Wiring Board – Video Section – ............................. 41
7-8. Schematic Diagram – Video (1/3) Section – ....................... 43
7-9. Schematic Diagram – Video (2/3) Section – ....................... 45
7-10. Schematic Diagram – Video (3/3) Section – .................... 47
7-11. Printed Wiring Board – Main Section – ........................... 49
7-12. Schematic Diagram – Main (1/4) Section – ..................... 51
7-13. Schematic Diagram – Main (2/4) Section – ..................... 53
7-14. Schematic Diagram – Main (3/4) Section – ..................... 55
7-15. Schematic Diagram – Main (4/4) Section – ..................... 57
7-16. Printed Wiring Board – Leaf SW Section – ..................... 59
7-17. Schematic Diagram – Leaf SW Section – ........................ 59
7-18. Printed Wiring Board – Panel Section – ........................... 61
7-19. Schematic Diagram – Panel (1/2) Section – ..................... 63
7-20. Schematic Diagram – Panel (2/2) Section – ..................... 65
7-21. Schematic Diagram – Surround Section – ....................... 67
7-22. Printed Wiring Board – Surround Section – ..................... 68
7-23. Schematic Diagram – Front Amp Section – ..................... 69
7-24. Printed Wiring Board – Front Amp Section – .................. 71
7-25. Schematic Diagram – CD Motor Section – ...................... 73
7-26. Printed Wiring Board – CD Motor Section – ................... 75
7-27. Schematic Diagram – Trans Section – ............................. 77
7-28. Printed Wiring Board – Trans Section – ........................... 78
7-29. IC Block Diagrams ........................................................... 79
7-30. IC Pin Functions ............................................................... 82

8-1. Case Section ........................................................................ 92
8-2. Chassis Section ................................................................... 93
8-3. Front Panel Section ............................................................. 94
8-4. CD Mechanism Deck Section-1 (CDM38L-5BD34L) ....... 95
8-5. CD Mechanism Deck Section-2 (CDM38L-5BD34L) ....... 96
8-6. Base Unit Section (BU-5BD34L) ....................................... 97
8-7. TC Mechanism Section-1 (TCM230AWR2/230PWR2) .... 98
8-8. TC Mechanism Section-2 (TCM230AWR2/230PWR2) .... 99

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

100

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 –

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.

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.