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7. Check the level B of the oscilliscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following : A/B x 100 = less than ± 22%
Traverse waveform Center of the waveform
RF PLL Free-run Frequency Check Procedure : 1. Connect frequency counter to TP (PLCK) with lead wire.
BD board TP (PLCK) frequency counter
B 0V A (DC voltage)
+ �
level : 1.3 ± 0.6 Vp-p
2. Turned Power switch on. 3. Put the disc (YEDS-18) in to play the number five track. Confirm that reading on frequency counter is 4.3218MHz.
8. Press the REPEAT button. (The tracking servo and sledding servo are turned ON.) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 7.
Traverse waveform
VIDEO SECTION
Frequency adjustment 1. Connect the frequency counter to check point of the VIDEO board. 2. Adjust CT401 of the VIDEO board so that the frequency counter read 13.5MHz ± 40Hz at STOP condition.
frequency counter
C (DC 0V voltage)
Tracking servo Sled servo OFF
Tracking servo Sled servo ON
VIDEO board TP410 (DCLK)
+ �
9. Remove the lead wire connected step 1.
Adjustment Location : [ BD BOARD ] � SIDE A � [ VIDEO BOARD ] � SIDE B �
1 IC103 10
20 (RF) 11 (VC)
(FE) (FEI)
(TE)
SL703 (AFADJ) SL702 (ADJ) IC751 IC251 SL701 (CAL BAR)
CT401 Frequency
TP410 (DCLK)
(PLCK) IC101
� 16 �
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