— 9 —
6. 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
B
level : 1.3 ± 0.6 Vp-p
0V
A (DC voltage)
7. Press the “8” 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 6.
Traverse waveform
0V
Tracking servo
Sledding servo
OFF
Tracking servo
Sledding servo
ON
C (DC
voltage)
8. Disconnect the lead wire of TP1 (ADJ) connected in step 1.
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point (PLCK) with lead wire.
2. Turn 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.
Adjustment Location :
[ BD BOARD ] — Side A —
[ MAIN BOARD ] — Component Side —
frequency counter
BD board
TP (PLCK)
(PLCK)
IC101
10
1
IC103
20
(RF)
(VC)
11
(TE)
(FEI)
(FE)
TP1 (ADJ)
TP2 (AFADJ)
R622
J681
IC651
CN621
IC631
R621
IC621
J621
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