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MICROFILM
SERVICE MANUAL
MINI Hi-Fi COMPONENT SYSTEM
E Model
HCD-VX5A/VX7A
Tourist Model
HCD-VX5AJ
SPECIFICATIONS
HCD-VX5A/VX5AJ/VX7A
Photo: HCD-VX7A
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol
a are trade-
marks of Dolby Laboratories Licensing Corporation.
HCD-VX5A/VX5AJ/VX7A is the Amplifier,
Video CD player, Tape Deck and Tuner
section in MHC-VX5A/VX5AJ/VX7A.
­ Continued on next page ­
Model Name Using Similar Mechanism
HCD-GRX50/RXD7
CD Mechanism Type
CDM38L-5BD34L
Base Unit Name
BU-5BD34L
Optical Pick-up Name
KSS-213D/Q-RP
Model Name Using Similar Mechanism
HCD-GRX50/RXD7
Tape Transport Mechanism Type
TCM-230AWR2
CD
Section
Tape deck
Section


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­ 2 ­
TABLE OF CONTENTS
1.
SERVICING NOTES ............................................... 3
2.
GENERAL ..................................................................
6
3.
DISASSEMBLY ........................................................ 10
4.
TEST MODE ............................................................. 13
5.
MECHANICAL ADJUSTMENTS ...................... 16
6.
ELECTRICAL ADJUSTMENTS
DECK Section ................................................................ 16
CD Section ..................................................................... 19
VIDEO Section .............................................................. 20
7.
DIAGRAMS
7-1.
Block Diagram ­ CD SERVO Section ­ ...................... 21
7-2.
Block Diagram ­ AUDIO/VIDEO CD Section ­ ........ 23
7-3.
Block Diagram ­ TAPE DECK Section ­ .................... 25
7-4.
Block Diagram ­ MAIN Section ­ ............................... 27
7-5.
Block Diagram ­ DISPLAY/KEY CONTROL/
POWER SUPPLY Section ­ .......................................... 29
7-6.
Note for Printed Wiring Boards and
Schematic Diagrams ...................................................... 31
7-7.
Printed Wiring Board ­ BD Board­ ............................. 33
7-8.
Schematic Diagram ­ BD Board­ ............................... 35
7-9.
Schematic Diagram ­ VIDEO Board (1/2) ­ .............. 37
7-10. Schematic Diagram ­ VIDEO Board (2/2) ­ .............. 39
7-11. Printed Wiring Board ­
VIDEO Board ­ ............................................................. 41
7-12. Printed Wiring Boards ­ CD MOTOR Section ­ ......... 45
7-13. Schematic Diagram ­ CD MOTOR Section ­ ............ 47
7-14. Printed Wiring Board ­ AUDIO Board ­ ..................... 49
7-15. Schematic Diagram ­ AUDIO Board ­ ....................... 51
7-16. Printed Wiring Board ­ LEAF SW Board ­ ................. 53
7-17. Schematic Diagram ­ LEAF SW Board ­ .................. 53
7-18. Printed Wiring Board ­ MAIN Board ­ ....................... 55
7-19. Schematic Diagram ­ MAIN Board (1/4) ­ ................ 57
7-20. Schematic Diagram ­ MAIN Board (2/4) ­ ................. 59
7-21. Schematic Diagram ­ MAIN Board (3/4) ­ ................. 61
7-22. Schematic Diagram ­ MAIN Board (4/4) ­ ................. 63
7-23. Printed Wiring Board ­ PANEL Board ­ ..................... 65
7-24. Schematic Diagram ­ PANEL Board ­ ........................ 67
7-25. Printed Wiring Board ­ CD SW Board ­ ..................... 69
7-26. Schematic Diagram ­ CD SW Board ­ ...................... 70
7-27. Printed Wiring Board
­ TRANSFORMER Board­ .......................................... 71
7-28. Schematic Diagram
­ TRANSFORMER Board ­ ......................................... 71
7-29. Printed Wiring Board ­ SURROUND Board ­ ........... 73
7-30. Schematic Diagram ­ SURROUND Board ­ .............. 74
7-31. IC Pin Function Description .......................................... 80
8.
EXPLODED VIEWS ............................................... 90
9.
ELECTRICAL PARTS LIST .............................. 99


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­ 3 ­
SECTION 1
SERVICING NOTES
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 PUB-
LISHED BY SONY.
SELF-DIAGNOSIS
This unit is equipped with a self-diagnosis function.
The function is used for diagnosing the conditions of the circuits
of the VIDEO board.
The circuits can be determined if normal or abnormal by the light-
ing of D502 of the VIDEO board.
Lighting of D502
When lit
: Operates normally
Blinks repeatedly: The circuit may be faulty.
­ VIDEO Board (Side A) ­
D502
IC505
The laser diode in the optical pick-up block may suffer electro-
static 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 emis-
sion, observe from more than 30 cm away from the objective lens.
Notes on chip component replacement
· Never reuse a disconnected chip component.
· Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
· Keep the temperature of the soldering iron around 270 °C dur-
ing 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.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
The following caution label is located inside the unit.


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­ 4 ­
MODEL IDENTIFICATION
­ Rear Panel ­
PART No.
MODEL
PART No.
VX5A : Saudi Arabia model
4-215-639-0
VX5A : Malaysia and Singapore models
4-215-639-1
VX5A : Taiwan model
4-215-639-2
VX5A : E model
4-215-639-3
VX5A : Thai model
4-215-639-4
VX5A : Hong Kong model
4-215-639-5
VX5A : Indonesia model
4-215-639-6
VX5AJ: Saudi Arabia model
4-215-639-7
VX5AJ: Tourist model
4-215-639-8
VX5AJ: E model
4-215-639-9
VX7A : Saudi Arabia model
4-215-640-0
VX7A : Malaysia and Singapore models
4-215-640-1
VX7A : E, Indonesia and Thai models
4-215-640-4


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­ 5 ­
NOTE FOR INSTALLATION (ROTARY ENCODER)
1 Remove the Case.
3 Pull-out the disc tray.
2 Turn the cam to the
direction of arrow.
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS' OFF.
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.