SECTION 5
ADJUSTMENTS
Focus Bias Check
CD SECTION
Condition :
Precautions for Adjustment
Y Hold the set in horizontal state.
1. Before beginning adjustment, set the equipment to service mode.
After the completion of adjustment, be sure to reset the service
Procedure :
mode.
For more information, see OService Mode (service program)�
[MAIN BOARD] (Side B)
on page 7.
2. Perform adjustments in the order given.
oscilloscope
3. Use the disc (YEDS-18. Part No. 3-702-101-01) unless other-
(AC range)
wise indicated.
4. Power supply voltage requirement : DC 4.5 V
HOLD switch : OFF2 kW
VOLUME: Minimum
TP513 (RFO)
SOUND switch : NORMTP533
AVLS switch: OFF(VC)
TP102
D105
FB101
Before Beginning Adjustment
C108
Set the equipment to service mode (See page 7) and check the fol- C105FB302
C205D804
lowing.807TP306
Q101
C520
If there in an error, repair the equipment. Q201
TP302
C208 TP202D205
Y Checking of the sled motorFB201
R521
1. Open the upper panel.TP522TP508
L502TP515
2. Press the + and = keys and check that the optical pick-upTP507TP521
can move smoothly without sluggishness or abnormal noise inC525TP514R519Q501R512
C514 TP503C501
(TEO)
innermost periphery n outermost periphery n innermost pe-R517TP509 TP502TP511
riphery. 0TP534 TP512TP533R501
+ : The optical pick-up moves outwardly32 30TP54725C599C598R502R503R504 (VC)
C517
= : The optical pick-up moves inwardlyR505124TP506
TP523
C512
115IC50120C503TP513C505TP504
(RFO)C510
Y Checking of focus searchingC50617
8TP540
1. Open the upper panel.C513R549C504
48
L508C571
2. Press the ^ key. (Focus searching operation is activated con-
tinuously).
1. Set the equipment to service mode stop state (See page 7).
3. Check the object lens of the optical pick-up for smooth up/down
2. Connect the oscilloscope between TP513 (RFO) and TP533 (VC)
motion without sluggishness or abnormal noise.
on the MAIN board.
4. Press the p key.
3. Move the optical pick-up by Pressing the + and = keys.
Check that focus searching operation is deactivated. If not, again
4 Put the disc (YEDS-18).
press the p key slightly longer.
5. Press the ^ key.
From focus searching, focus is turned ON while entering
( )
CLV drawing-in mode. Tracking and sled are turned OFF.
6. Press the PLAY MODE key. (Both tracking and sled are turned
ON).
7. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape (a) in the cen-
ter of the waveform can be clearly distinguished.
RF level
0.8 � 1.2 Vp-p
Y RF Signal Reference Waveform (eye pattern)
To watch the eye pattern, set the oscilloscope to AC range and
increase the vertical sensitivity of the oscilloscope for easy watch-
ing.
8. Stop removing of the motor by pressing the p key.
9. After the completion of adjustment, reset service mode.
(See page 7 )
� 8 � |
ACEC
