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— 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.

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%

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

 

— Side A —

IC101

TP (RF)

TP (FE)

TP (VC)

TP (TE)

TP (FEI)

IC103