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HCD-VX90AV
E Model
SPECIFICATIONS
COMPACT DISC DECK RECEIVER
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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
SERVICE MANUAL
HCD-VX90AV is the tuner, deck, CD and
amplifier section in MHC-VX90AV.


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4-215-642-1
EA, MY, SP model
4-215-642-3
IA model
4-215-642-4
E model
4-215-642-5
TH model
MODEL IDENTIFICATION
-- BACK PANEL --
· Abbreviation
SP
: Singapore model
MY
: Malaysia model
IA
: Indonesia model
TH
: Thai model
EA
: Saudi arabia model
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.
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.
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


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TABLE OF CONTENTS
1. SERVICING NOTE .......................................................... 4
2. GENERAL .......................................................................... 7
3. DISASSEMBLY
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
4. TEST MODE ..................................................................... 12
5. MECHANICAL ADJUSTMENTS .......................... 13
6. ELECTRICAL ADJUSTMENTS ............................... 13
7. DIAGRAMS
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. EXPLODED VIEWS
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
9. ELECTRICAL PARTS LIST .............................. 100
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.


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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.


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MC Cold Reset
· The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the
customer.
Procedure:
1. Press three buttons
p , ENTER/NEXT , and 1/u simultaneously.
2. "COLD RESET" is displayed on the fluorescent display tube and reset is executed.
CD Delivery Mode
· This mode moves the optical pick-up to the position durable to vibration. Use this mode when returning the set to the customer after repair.
Procedure:
1. Press
1/u button to turn the set ON.
2. Press CD LOOP button and
1/u button simultaneously.
3. A message "LOCK" is displayed on the fluorescent indicator tube, and the CD delivery mode is set.
MC Hot Reset
· This mode resets the set with the preset data kept stored in the memory. The hot reset mode functions same as if the power cord is plugged
in and out.
Procedure:
1. Press three buttons
p , ENTER/NEXT , and DISC 1 simultaneously.
2. The fluorescent indicator tube becomes blank instantaneously, and the set is reset.
Sled Servo Mode
· This mode can run the CD sled motor freely. Use this mode, for instance, when cleaning the optical pick-up.
Procedure:
1. Press
1/u button to turn the set ON.
2. Press three buttons
p , ENTER/NEXT , and § simultaneously.
3. The Sled Servo mode is selected, if "CD" is blanking on the fluorescent indicator tube.
4. With the CD in stop status, When the
) + button is pressed, the optical pick-up moves outside. When ­ 0 button is pressed, it
moves inside.
5. To exit from this mode, perform as follows:
1) Move the optical pick-up to the most inside track.
2) Execute MC cold reset. (Press the three buttons
p , ENTER/NEXT , and 1/u button simultaneously.)
Note:
· Always move the optical pick-up to most inside track when exiting from this mode. Otherwise, a disc will not be unloaded.
· Do not run the sled motor excessively, otherwise the gear can be chipped.
Change-over of AM Tuner Step between 9kHz and 10kHz
· A step of AM channels can be changed over between 9kHz and 10kHz.
Procedure:
1. Press
1/u button to turn the set ON.
2. Select the function "TUNER", and press TUNER/BAND button to select the BAND "AM".
3. Press
1/u button to turn the set OFF.
4. Press ENTER/NEXT and
1/u buttons simultaneously, and the display of fluorescent indicator tube changes to "AM 9k STEP" or "AM
10k STEP", and thus the channel step is changed over.
LED and Fluorescent Indicator Tube All Lit, Key Check Mode
Procedure:
1. Press three buttons
p , ENTER/NEXT , and DISC 2 simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
Press DISC 2 button, and the key check mode is activated.
3. In the key check mode, the fluorescent indicator tube displays "K 0 V0 J0". Each time a button is pressed, "K"value increases. However,
once a button is pressed, it is no longer taken into account.
"J" Value increases like 1, 2, 3 ... if rotating
0 AMS ) knob in "+" direction, or it decreases like 0, 9, 8 ... if rotating in "-" direction.
"V" Value increases like 1, 2, 3 ... if rotating VOLUME knob in "+" direction, or it decreases like 0, 9, 8 ... if rotating in "-" direction.
4. To exit from this mode, press three buttons in the same manner as step 1, or disconnect the power cord.