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To judge whether the pickup is ok or not by observing the focus error signal. The pickup is
judged from the amplitude of the tracking error signal (as discussed in the section on adjusting
the tracking error balance) and the waveform for the focus error signal.
@ Symptom when out of
adjustment
5 ms/division
i
YEDS-7
DC mode
one
[Procedure]
1. Connect TP! Pin 5 to ground.
2. Mount the disc.
A
A=B
A+B 22.5Vp-p
B
[Judging the pickup]
something wrong with the pickup.
1. The tracking error signal amplitude is extremely small (less than 2 Vp-p).
2. The focus error signal amplitude is extremely small (less than 2.5 Vp-p).
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