Sony D-V55 User manual

Ver 1.0 1999.05
MICROFILM
D-V55
SERVICE MANUAL
PORTABLE VIDEO CD PLAYER
SPECIFICATIONS
E Model
Chinese Model
Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM-2901ABA
Optical Pick-up Type DAX-01A2
Two LR6 (size AA) batteries:3VDC
Battery case (External Batteries):
Two LR6 (size AA) batteries:3VDC
AC power adaptor (DC IN 6V jack):
220-230 V, 50/60Hz
220 V, 50Hz
220 V, 50/60Hz

– 2 –
Specifications ........................................................................... 1
1. SERVICING NOTE....................................................... 3
2. GENERAL
Location and Function of Controls .................................... 4
3. DISASSEMBLY
3-1. Cabinet (Lower) Sub ASSY ....................................... 6
3-2. Lid Sub ASSY, Switch Unit ........................................ 6
3-3. MPEG Board .............................................................. 7
3-4. MD ASSY, IR Board .................................................. 7
3-5. Main Board ................................................................. 8
3-6.Turn Table Motor ASSY (Spindle) (M902),
Optical Pick-up (DAX-01A2),
Sled Motor ASSY (M901) .......................................... 8
4. SERVICE MODE (TEST MODE)
4-1. How to Enter the Test Mode ....................................... 9
4-2. How to Release the Test Mode ................................... 9
4-3. Each Key Function in Test Mode ............................... 9
5. ELECTRICAL ADJUSTMENTS
5-1. Precautions for Adjustment ...................................... 10
5-2. Before Beginning Adjustment .................................. 10
5-3. Tracking Balance Check ........................................... 10
5-4. Focus Bias Check ......................................................11
6. DIAGRAMS
6-1. Explanation of IC Terminals..................................... 12
6-2. Block Diagram.......................................................... 19
6-3. Printed Wiring Boards (Main Section) ..................... 23
6-4. Schematic Diagram (Main Section) ......................... 27
6-5. Schematic Diagram (MPEG Section)....................... 34
6-6. Printed Wiring Boards (MPEG Section) .................. 37
7. EXPLODED VIEWS
7-1. Cabinet (Upper) Section ........................................... 42
7-2. Cabinet (Lower) Section........................................... 43
7-3. Optical Pick-up Section (CDM-2901ABA) ............. 44
8. ELECTRICAL PARTS LIST ................................45
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINEWITH
MARK !ON THE SCHEMATIC DIAGRAMS AND INTHE PARTS
LIST ARE CRITICALTO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN INTHIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
Flexible Circuit Board Repairing
• Keep the temperature of the 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.
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.
TABLE OF CONTENTS
This Compact Disc player is
classified as a CLASS 1 LASER
product.
The CLASS 1 LASER
PRODUCT label is located on the
bottom exterior.
CAUTION
Use of controls or adjustments or performance of procedures other than
those specified herein may result in hazardous radiation exposure.
DANGER
Invisible laser radiation when open and interlock failed or defeated.
Avoid direct exposure to beam.

– 3 –
SECTION 1
SERVICING NOTE
NOTES ON HANDLINGTHE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static breakdown because of the potential difference generated by
the charged electrostatic load, etc. on clothing and the human
body. During repair, pay attention to electrostatic breakdown 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 30cm away from the objective lens.
Before Replacing the Optical pick-up Block
Please be sure to check thoroughly the parameters as per the
“Optical pick-up Block Checking Procedure” (Part No. : 9-960-
027-11) issued separately before replacing the optical Pick-up
block.
Note and specifications required to check are given below.
• FOK output : IC601 ((£pin (FOK).
When checking FOK, remove the lead wire to disc motor.
• S curve P-to-P value : 1.2 – 2Vp-p IC501 !§pin.
When checking S curve P-to-P value, remove the lead wire to
disc motor.
• RF signal P-to-P value : 0.5 – 0.9Vp-p
• Traverse signal P-to-P value : 1.2 – 2.0Vp-p
• The repairing grating holder is impossible.
Laser Diode Checking Methods
During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper panel is closed while turning
ON the S804 (push switch type).
The following two checking methods for the laser diode are
operable.
Method-1 (In the service mode or normal operation) :
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. Push the S804 as shown in Fig. 1-1.
3. Press the flkey.
4. Check the object lens for confirming normal emission of the
laser diode. If not emitting, there is a trouble in the automatic
power control circuit or the optical pick-up. During normal
operation, the laser diode is turned ON about 2.5 seconds for
focus searching.
Method-2 (In the service mode or normal operation) :
Check the value of current flowing in the laser diode.
1. Remove the upper panel.
2. Read the current printed on the rear side of the optical pick-up.
(Print on the rear side of the optical pick-up)
Fig.1-1 Method to push S804
AC2211397 year
version
month
A : less than 48 mA
current value
date
line No.
shift No.
Fig. 1-2 DigitalVoltmeter Connecting Location
[MAIN BOARD] (SIDE B)
43
2
1
5
6
43
2
1
5
6
1
5
10
11
20
BCE
B
C
E
BCE
BCE
BCE
R532
C525
C526
R751
C518
D501
C516
R544
L506
R518
IC501
R520
R531
R522
R542
R514
C530
C507
R515
R513
R525
C522
C529
R512
R516
R543
C502 Q504
R510
Q506
Q502
R509
C509
R506
R554
R528
R507
R511
R521
R519
R517
R526
Q501
C519
R523
Q503
Q507
C508
R527
TP512
TP520
TP534
TP540
TP537
TP531
TP536
TP524
TP535(RFO)
TP522
(FE) TP523
(TE)
TP508
(VC)
TP521
TP752
TP810
TP809
TP530
TP525
15
TP524
digital voltmeter
TP520
S804
3. Connect a digital voltmeter as shown in Fig. 1-2
4. Press the flkey.
5. Calculate the current value by the reading of the digital
voltmeter.
Reading of the digital voltmeter V ÷ 4.7 Ω= current value (A)
(Example) Reading of the digital voltmeter of 0.2256 V :
0.2256 V ÷ 4.7 Ω = 0.048 (A) = 48 mA
6. Check that the current value is within the following range.
+5
• Current value of the label -11 mA(25˚C)
Variation by temperature : 0.4mA / ˚C
Current increases with temperature increased.
Current decreases with temperature decreased.
If the current is more than the range above, there is a trouble
in the automatic power control circuit or the laser diode is in
deterioration.
If less than the range, a trouble exists in the automatic power
control circuit or the optical pick-up.

– 4 –
SECTION 2
GENERAL This section is extracted from
instruction manual.
LOCATION AND FUNCTION OF CONTROLS

– 5 –

– 6 –
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. CABINET (LOWER) SUB ASSY
3-2. LID SUB ASSY, SWITCH UNIT
rThe equipment can be removed using the following procedure.
MPEG board
Cabinet (Lower) sub ASSY
Lid sub ASSY, Switch unit
Set Main board
Turn table motor ASSY (Spindle)
(M902), Optical pick-up (DAX-01A2),
Sled motor ASSY (M901)
MD ASSY, IR board
Claw
4
5
2
3
Lid sub ASSY
Flexible
board
1 Screws (B2x10)
Cabinet (lower) sub ASSY
Battery lid
6 Claws
6 Claws
7
2
8
Cabinet (upper) sub ASSY
Lid sub ASSY
Cover, lid
Switch unit
1 OPEN
5 Screws (1.7x4)
4 Spring, torsion
3 Bracket (spring)

– 7 –
3-3. MPEG BOARD
3-4. MD ASSY, IR BOARD
1
MPEG board
CN601
Cabinet (lower) sub ASS
Y
5
MD ASSY
CN501
4 CN504 (black)
3 CN503 (green)
2 CN502 (white)
6 IR board
1 Flexible board
Cabinet (lower) sub ASS
Y

– 8 –
3-5. MAIN BOARD
Main board
Cabinet (lower) sub ASS
Y
1
3-6.TURNTABLE MOTOR ASSY (SPINDLE) (M902), OPTICAL PICK-UP (DAX-01A2),
SLED MOTOR ASSY (M901)
!º
45
7
8
2
1
Screws (B1.7)
9 Screws
(+P1.4x2.5)
3 Screw (B1.7x6)
6 Screw
Screw ASSY, Feed
Spring, sled
Optical pick-up
(DAX-01A2)
Turn table motor ASSY (Spindle) (M902)
Chassis
Sled motor ASSY
(M901)
Rack

– 9 –
SECTION 4
SERVICE MODE (TEST MODE)
• In this set, there are two test modes; CD-DA Test Mode and
VIDEO CD Test Mode.
4-1. How to Enter theTest Mode
1. Disconnect external power (no current is applied to the set).
2. Bridge the TAP801 (TEST) on the MAIN Board with a solder.
(IC801 (∞ (TEST) pin is shorted to the ground.)
3. Connect the external power.
4. The CD-DA Test Mode is activated. (LCD display varies in 5-
ways, and its 5-way display is repeated.)
5. Before connecting external power in step 3, if π(STOP) key
was pressed, the mode is switched to VIDEO CD Test Mode.
(On the LCD, all segments are displayed, and the video monitor
becomes 100% white.)
4-2. How to Release theTest Mode
1. Always disconnect external power, and break the solder bridge
of TAP801 (TEST) on the MAIN Board.
2. Thus, the set become ready for normal operation.
4-3. Each key Function inTest Mode
1. CD-DATest Mode
2. VIDEO CD Test Mode
– MAIN Board – (Side A)
Fig.4-1 Test terminal location and connecting position
Switches Description
πStop processing
Press once: Initialize, Average Correct
flPress twice: Auto Focus
(PLAY/PAUSE) Press 3 times: Focus Auto Gain
Press 4 times: Tracking Auto Gain
Press 5 times: All Servo ON, Mute OFF
Repeat once more the processing currently
SELECT selected with fl(PLAY/PAUSE) key.
±Move optical pick-up toward outside track
(NEXT)
≠Move optical pick-up toward inside track
(PREV)
ˆTurn off the Mute
(RETURN)
ESP Turn on/off the ESP (fast speed play, when
ON)
REPEAT/ Tracking Gain up/normal switching
ENTER
+Raise K13* by one step after Focus Auto
Gain
MENU Raise K23** by one step after Tracking
Auto Gain
–Lower K13* by one step after Focus Auto
Gain
MENU Lower K23** by one step after Tracking
Auto Gain
Switches Description
πGo to CD-DA Test Mode
SELECT Video system reset (return to 100% white
screen)
TAP801
(TEST)
CN801
CN501
Monitor IN
Video monitor
Video OUT (J901)
J901
* Coefficient of Focus Gain
** Coefficient of Tracking Gain

– 10 –
SECTION 5
ELECTRICAL ADJUSTMENTS
5-1. Precautions for Adjustment
1. Before beginning adjustment, set the equipment to service
mode.
After the completion of adjustment, be sure to reset the
service mode.
For more information, see “Service Mode (Test Mode)” on
page 9.
2. Perform adjustments in the order given.
3. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.
4. Power supply voltage requirement: DC6 V
HOLD switch: OFF
VOLUME control: Minimum
RESUME switch: OFF
5-2. Before Beginning Adjustment
Set the equipment to service mode (See page 9) and check the
following. If there is an error, repair the equipment.
• Checking of the sled motor
1. Open the upper lid.
2. Press the ±and ≠keys and check that the optical pick-
up can move smoothly without sluggishness or abnormal
noise in innermost periphery noutermost periphery n
innermost periphery.
±: The optical pick-up moves outwardly.
≠: The optical pick-up moves inwardly.
•Checking of the Focus serching
1. Open the upper lid.
2. Press the flkey twice. (Focus searching operation is
activated continuously.)
3. Check the object lens of the optical pick-up for smooth up/
down motion without sluggishness or abnormal noise.
4. Press the πkey.
Check that focus searching operation is deactivated. If not,
again press the πkey slightly longer.
5-3. Tracking Balance Check
Condition:
• Hold the set in horizontal state.
Connection:
43
2
1
5
6
43
2
1
5
6
1
5
10
11
20
BCE
B
C
E
BCE
BCE
BCE
R532
C525
C526
R751
C518
D501
C516
R544
L506
R518
IC501
R520
R531
R522
R542
R514
C530
C507
R515
R513
R525
C522
C529
R512
R516
R543
C502 Q504
R510
Q506
Q502
R509
C509
R506
R554
R528
R507
R511
R521
R519
R517
R526
Q501
C519
R523
Q503
Q507
C508
R527
TP512
TP520
TP534
TP540
TP537
TP531
TP536
TP524
TP535(RFO)
TP522
(FE) TP523
(TE)
TP508
(VC)
TP521
TP752
TP810
TP809
TP530
TP525
15
TP523(TE)
oscillscope
(DC range)
TP508(VC)
Checking Method:
1. Connect the oscilloscope to TP523 (TE) and TP508 (VC) on
the MAIN board.
2. Set the equipment to service mode stop state. (See page 9.)
3. Press the flkey once.
4. Move the optical pick-up to the center by pressing the ±
and ≠keys.
5. Put the disc (YEDS-18).
6. Press the flkey twice.
From focus searching, focus is turned ON while entering CLV
drawing-in mode. Tracking and sled are turned OFF.
7. Confirm that a waveform on the oscilloscope is vertically
symmetric against 0 V.
8. Stop removing of the disc motor by pressing the πkey.
9. After the completion of check, reset service mode. (See page
9.)
MAIN board (Side B)
A
B
0 V
A
B
0 V
1.2 – 2 Vp-p
A=B A=B
Note: Take long sweep time
for easy monitoring.