Sony D-V8000, 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 ser-
vice mode.
For more information, see “Service Mode (Test Mode)” on
page 20.
2. Perform adjustments in the order given.
3. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indi- cated.
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 20) 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
fl
key once.
3. Press the
±
and
≠
keys and check that the optical pick-
up can move smoothly without sluggishness or abnormal noise
in innermost periphery
→
outermost periphery
→
innermost
periphery.
±
: The optical pick-up moves outwardly.
≠
: The optical pick-up moves inwardly.
• Checking of focus searching
1. Open the upper lid.
2. Press the
fl
key thrice. (Focus searching operation is acti-
vated 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:
Checking Method:
1. Connect the oscilloscope to TP524 (TE) and TP534 (VC)
on the MAIN board.
2. Set the equipment to service mode stop state. (See page
20.)
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 en-
tering 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 20.)
Connection Location: MAIN board (See page 23.)
+
–
oscilloscope
(DC range)
MAIN board
TP524 (TE)
TP534 (VC)
(see page 23)
A
B
0 V
A
B
0 V
1.2
±
0.5 Vp-p
A=B A=B
Note: Take long sweep time
for easy monitoring.