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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.
SECTION 5
ELECTRICAL ADJUSTMENTS
5-3. Tracking Balance Check
Condition:
• Hold the set in horizontal state.
Connection:
MAIN board (Side B)
Checking Method:
1. Connect the oscilloscope to TP523 (TE) and TP508 (VC) on
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 ±
5. Put the disc (YEDS-18).
6. Press the fl key twice.
7. Confirm that a waveform on the oscilloscope is vertically
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
– 10 –
BCE
the MAIN board.
and ≠ keys.
From focus searching, focus is turned ON while entering CLV
drawing-in mode. Tracking and sled are turned OFF.
symmetric against 0 V.
A
1.2 – 2 Vp-p
B
A=B
9.)
oscillscope
(DC range)
TP523(TE)
TP508(VC)
Note: Take long sweep time
for easy monitoring.
A
0 V
B
A=B
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