— 12 —
8.
Disconnect the lead wire of TP21 (ADJ) connected in step 2.
[MAIN BOARD] — (Component Side) —
2.
Turn
U
(power) switch on.
3.
Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MH
±30kHz.
Adjustment Location :
6.
Check the level B of the oscilloscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
RF PLL Free-run Frequency Check
Procedure :
1.
Connect frequency counter to test point TP (MNT1) with lead
wire.
7.
Press the “9” 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.
0V
Tracking servo
Sledding servo
OFF
Tracking servo
Sledding servo
ON
C (DC
voltage)
Traverse waveform
0V
B
Center of the waveform
A (DC voltage)
level : 1.3
±
0.6 Vp-p
Traverse waveform
R350
CN305
CN304
TP21
(ADJ)
TP51
(AF ADJ)
SERVO board
TP (MNT1)
frequency counter
[ SERVO BOARD ]
— Side A —
IC101
TP (RF)
TP (FE)
TP (VC)
TP (TE)
TP (FEI)
IC103
