Sony D-V55, Руководство по обслуживанию

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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
n outermost 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
fl
key 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
π
key.
Check that focus searching operation is deactivated. If not,
again press the
π
key slightly longer.
5-3. Tracking Balance Check
Condition:
• Hold the set in horizontal state.
Connection:
4 3
2
1
5
6
4 3
2
1
5
6
1
5
10 11
20
BC E
B
C
E
B
C
E
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
fl
key once.
4. Move the optical pick-up to the center by pressing the
±
and
≠
keys.
5. Put the disc (YEDS-18).
6. Press the
fl
key 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
π
key.
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.