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PD-S601
6. Focus Servo Loop Gain Adjustment
Out of adjustment
Optimum adjustment
Out of adjustment
CHI
CH2
@ Adjustment location
| Mother Board Assembly
20 mVidivision
SmV/division
VR152 (FCS. GAN)
X-¥ mode
© Disc
YEDS-7
[Procedure]
1. Set the AF generator output to 1.2kHz and | Vp-p.
adjustment
adjustment
adjustment
Figure 5 Eye pattem
(10:1)
5. RF Level Adjustment
@ Objective
To optimize the playback RF signa! amplitude
@ Symptom when out of | No play or no search
adjustment
@ Measurement instru-
Connect the oscilloscope to
@ Player state
Test mode, play
ment connections
TP1, Pin 1 (RF).
[Settings]
50mV/division
@ Adjustment location
| Pick up Assembly
10 ms/division
VAL ee)
AC mode
@Disc
YEDS-7
Focus Gain Adjustment
[Procedure]
1. Move the pickup to midway across the disc (R=35 mm) with the MANUAL SEARCH FWD D> or REV <k' key, then
press the PROGRAM key, then the PLAY > key in that order to close the respective servos and put the player into
play mode.
2. Adjust VRI (laser power) so that the RF signal amplitude is 1.2 Vp-p + 0.1 V.
Higher gain
Optimum gain
37
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