Sony Vx8 Owners Manual

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HCD-VX8/VX8J
E Model
SPECIFICATIONS
Photo: HCD-VX8 (SILVER)
COMPACT DISC DECK RECEIVER
Ñ Continued on next page Ñ
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-VX8/VX8J is the tuner, deck, CD and
amplifier section in MHC-VX8/VX8J. 
						

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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 ÒS curve checkÓ in ÒCD section adjustmentÓ and check
that the S curve waveform is output four times.
4-215-641-0¹VX8: EA MALAYSIA
4-215-641-1¹VX8: MY, SP MALAYSIA
4-215-641-2¹VX8: TW MALAYSIA
4-215-641-3¹VX8: E MALAYSIA
4-215-641-4¹VX8: IA INDONESIA
4-215-641-5¹VX8: HK MALAYSIA
4-215-641-6¹VX8J: E JAPAN
4-215-641-7¹VX8J: EA JAPAN
4-215-641-8¹VX8: TH THAI MODEL IDENTIFICATION
Ñ BACK PANEL Ñ
¥ Abbreviation
EA : Saudi Arabia model
TW : Taiwan model
IA : Indonesia model
HK : Hong Kong model
TH : Thai model
MY : Malaysia model
SP : Singapore model
CAUTIONUse 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 270ûC
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. MODELPRODUCT
COUNTRY 
						

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TABLE OF CONTENTS
1. SERVICING NOTE
.......................................................... 4
2. GENERAL.......................................................................... 5
3. DISASSEMBLY
3-1. Loading Panel ....................................................................... 7
3-2. Front Panel and Video Board ................................................ 7
3-3. Cassette Lid and Tape Mechanism ........................................ 8
3-4. CD SW Board and Panel Board ............................................ 8
3-5. Disc Tray ............................................................................... 9
4. SERVICE MODE............................................................ 10
5. TEST  MODE..................................................................... 12
6. MECHANICAL ADJUSTMENTS..........................13
7. ELECTRICAL ADJUSTMENTS............................... 13
8. DIAGRAMS
8-1. Circuit Boards Location ...................................................... 18
8-2. Block Diagrams
¥ CD Section ....................................................................... 19
¥ Video Section ................................................................... 21
¥ Deck Section .................................................................... 23
¥ Main Section .................................................................... 25
¥ Power Section .................................................................. 27
¥ Display Section ................................................................ 29
8-3. Printed Wiring Board Ð CD Section Ð ................................. 33
8-4. Schematic Diagram Ð CD Section Ð ................................... 35
8-5. Schematic Diagram Ð Deck Section Ð ................................. 37
8-6. Printed Wiring Board Ð Deck Section Ð .............................. 39
8-7. Printed Wiring Board Ð Video Section Ð ............................. 41
8-8. Schematic Diagram Ð Video (1/3) Section Ð ....................... 43
8-9. Schematic Diagram Ð Video (2/3) Section Ð ....................... 45
8-10. Schematic Diagram Ð Video (3/3) Section Ð .................... 47
8-11. Printed Wiring Board Ð Main Section Ð ........................... 49
8-12. Schematic Diagram Ð Main (1/4) Section Ð ..................... 51
8-13. Schematic Diagram Ð Main (2/4) Section Ð ..................... 53
8-14. Schematic Diagram Ð Main (3/4) Section Ð ..................... 55
8-15. Schematic Diagram Ð Main (4/4) Section Ð ..................... 57
8-16. Printed Wiring Board Ð Leaf SW Section Ð ..................... 59
8-17. Schematic Diagram Ð Leaf SW Section Ð ........................ 59
8-18. Printed Wiring Board Ð Panel Section Ð ........................... 61
8-19. Schematic Diagram Ð Panel (1/3) Section Ð ..................... 63
8-20. Schematic Diagram Ð Panel (2/3) Section Ð ..................... 65
8-21. Schematic Diagram Ð Panel (3/3) Section Ð ..................... 67
8-22. Schematic Diagram Ð CD Motor Section Ð ...................... 69
8-23. Printed Wiring Board Ð CD Motor Section Ð ................... 71
8-24. Schematic Diagram Ð Trans Section Ð ............................. 73
8-25. Printed Wiring Board Ð Trans Section Ð ........................... 75
8-26. Schematic Diagram Ð Surround Section Ð ....................... 76
8-27. Printed Wiring Board Ð Surround Section Ð ..................... 76
8-28. IC Block Diagrams ........................................................... 77
8-29. IC Pin Functions ............................................................... 80
9. EXPLODED VIEWS
9-1. Case Section ........................................................................ 90
9-2. Chassis Section ................................................................... 91
9-3. Front Panel Section ............................................................. 92
9-4. CD Mechanism Deck Section-1 (CDM38L-5BD34L) ....... 93
9-5. CD Mechanism Deck Section-2 (CDM38L-5BD34L) ....... 94
9-6. Base Unit Section (BU-5BD34L) ....................................... 95
9-7. TC Mechanism Section-1 (TCM230AWR2/230PWR2) .... 96
9-8. TC Mechanism Section-2 (TCM230AWR2/230PWR2) .... 97
10. ELECTRICAL PARTS LIST .............................98 
						

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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)
3 Pull-out the disc tray.
1 Remove the Case.
2 Turn the cam to the direction
     of arrow.
BU cam
GrooveSection ANote: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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LOCATION OF PARTS AND CONTROLS
11/u (Power) button and indicator
2DEMO (STANDBY) button
3DISC 1 button and indicator
4DISC 2 button and indicator
5DISC 3 button and indicator
6DISC SKIP/EXÐCHANGE button
7¤ (Eject) button
8Disc tray
9EDIT DIRECTION/TUNER MEMORY
button
10PLAY MODE/DOLBY NR button
11REPEAT/STEREO/MONO button
12p button
13^ (CD) button and indicator
14TUNER/BAND button
15CD NON-STOP button and indicator
16KARAOKE PON/MPX button
17SYNC EQ button
18SYNC BASS button
19REC PAUSE/START button and
indicator
20DBFB button21SURROUND button
22HI DUB button
23CD SYNC button
24VOLUME knob
25PHONES jack
26ENTER/NEXT button
27) + button and indicator
28JOG/0x) dial and indicator
29GROOVE button and indicator
300 Ð button and indicator
31AUTO BPM button and indicator
32PAD B button and indicator
33PAD A button and indicator
34MIC 2 jack
35MIC 1 jack
36CD FLASH button
37CD LOOP button
38MIC LEVEL knob
39JAM button and indicator
40LEVEL button
41MIX button
42ECHO LEVEL knob43BEAT SPEED button
44BEAT SELECT button
45BEAT ON/OFF button and indicator
46P FILE MEMORY button
47GEQ CONTROL button
48FILE SELECT
49EFFECT button
50NEXT button
51PREV button
52RETURN button
53SELECT button
54( (TAPE B) button and indicator
559 (TAPE B) button and indicator
56( (TAPE A) button and indicator
579 (TAPE A) button and indicator
58FUNCTION button
59Remote sensor
60  DISPLAY button
61SPECTRUM ANALYZER button
62CLOCK/TIME SET button
63TIMER SELECT button and indicator
64Display Window
SECTION 2
GENERAL
Front Panel
18 9
10
118 234 756 1
1213
14
16
17 15
19
20
21
22 38 48 4950 51
52
4142
43
44 4546 47
40 39
37 5355
56 5860 61
54
5759 62
31 30 2923
24
25 32 33
34
26
27
28 3536 6364 
						

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This section is extracted from
instruction manual. 
						

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SECTION 3
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
3-1. LOADING PANEL
3-2. FRONT PANEL AND VIDEO BOARD
3 Loading panel
2 Pull-out the disc tray.
1 Turn the cam to the direction
     of arrow. Claws
3 Screw (BVTT 3x6)
4 Screw (BVTT 3x6) 
0 Front panel
!¢ Screw (BVTP 3x8)
!° Video board
6 Screw (BVTP 3x10)
!£ Two screws (BVTP 3x8)
5 Screw
     (BVTP3x10)
1 Screw (BVTT 3x6) 
2 Screw (BVTT 3x6) 
7 Flat type wire
     (CN501)
8 Flat type wire
     (CN304)
Lead wires
Lead wire
9 Flat type wire
     (CN303)
!Á Flat type wire
     (CN501)!ª Flat type wire
     (CN503) 
						

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3-3. CASSETTE LID AND TAPE MECHANISM
3-4. CD SW BOARD AND PANEL BOARD
1 Release
3 Cassette holder (R)
     assembly
4 Cassette holder (L)
     assembly
Portion 
B
Portion B
7 Two screws
     (BVTP2.6x8)
8 Three screws
     (BVTP2.6x8)
9 Tape mechanism
2 Release
     (Refer to order No. 1)
Portion A
Portion A
Note for installation
5 Tension spring
6 Tension spring
4 Knob (Jog)
5 Knob (Vol)
9 Four screws
     (BVTP2.6x8)
3 CD SW board
0 Five screws
     (BVTP2.6x8)
!Á Five screws
     (BVTP2.6x8)!ª Panel board
2 Three screws
     (BVTP2.6x8)
8 Flat type wire
     (CN601)
1 Three screws
     (BVTP2.6x8)
7 Nut
6 Nut 
						

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3-5. DISC TRAY
(Perform after removing the front panel.)Note:When installing the Disc tray, pull around the flat type wire to
         pass through the claw A and claw B, as shown in the figure.
Claw 
B
Claw A
1 
Turn the cam the
     direction of arrow.
2 Pull-out the disc tray.5 Remove the disc tray.
4 Two claws
3 Flat type wire  (8 core) 
						

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SECTION  4
SERVICE MODE
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. ÒCOLD RESETÓ 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  LOOP  button and  1/u  button simultaneously.
3. A message ÒLOCKÓ 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 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 ÒCDÓ 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  Ð 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 ÒTUNERÓ, and press  TUNER/BAND  button to select the BAND ÒAMÓ.
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 ÒAM 9k STEPÓ or ÒAM
10k STEPÓ, 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 ÒK 0 V0 J0Ó.  Each time a button is pressed, ÒKÓvalue increases. However,
once a button is pressed, it is no longer taken into account.
ÒJÓ Value increases like 1, 2, 3 ... if rotating  0 AMS )  knob in Ò+Ó  direction, or it decreases like 0, 9, 8 ... if rotating in Ò-Ó direction.
ÒVÓ Value increases like 1, 2, 3 ... if rotating  VOLUME  knob in Ò+Ó  direction, or it decreases like 0, 9, 8 ... if rotating in Ò-Ó direction.
4. To exit from this mode, press three buttons in the same manner as step 1, or disconnect the power cord.