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SECTION 5 ADJUSTMENTS
CD SECTION
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 (service program)� on page 7. 2. Perform adjustments in the order given. 3. Use the disc (YEDS-18. Part No. 3-702-101-01) unless otherwise indicated. 4. Power supply voltage requirement : DC 4.5 V HOLD switch VOLUME SOUND switch AVLS switch : OFF : Minimum : NORM : OFF Focus Bias Check Condition : � Hold the set in horizontal state. Procedure :
[MAIN BOARD] (Side B)
oscilloscope (AC range) TP513 (RFO) 2 k�
TP533 (VC)
7
54 55 60 65 70 72
1
Before Beginning Adjustment Set the equipment to service mode (See page 7) and check the following. If there in an error, repair the equipment. � Checking of the sled motor 1. Open the upper panel. 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 focus searching 1. Open the upper panel. 2. Press the ^ key. (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 p key. Check that focus searching operation is deactivated. If not, again press the p key slightly longer.
C879
TP816
TP511 TP512 TP507 TP503
TP502 TP523
C516 C549 TP532
R510 Q501
TP508
R809
(TEST)
TP506
R506 R507
TP547
TP534TP555 TP505 TP509 TP510
R505 R509
TP518 TP517
TP514 (TEO)
TP521 TP522
C599 R503 TP513(RFO)
11 10
C501 TP519
TP525
R502
TP504
TP533(VC)
5 1
LCD801
2. Connect the oscilloscope between TP513 (RFO) and TP533 (VC) on the MAIN board. 3. Move the optical pick-up by Pressing the + and = keys. 4 Put the disc (YEDS-18). 5. Press the ^ key. From focus searching, focus is turned ON while entering CLV drawing-in mode. Tracking and sled are turned OFF.
R501 R512
1. Set the equipment to service mode stop state (See page 7).
(
L502
)
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 (�) in the center of the waveform can be clearly distinguished.
VOLT/DIV : 200 mV TIME/DIV : 0.5 ms RF level 0.8 � 1.2 Vp-p
� 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 watching. 8. Stop removing of the motor by pressing the p key. 9. After the completion of adjustment, reset service mode. (See page 7 )
