Marantz MD110, Service Manual

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8 Focus Bias Adjustment
Use the special disc (continuous recorded disc)
No. Key Display/Function
1 MULTI JOG Select [FBIAS ADJUST]
2 Load the disc.
3 PLAY [a=xx yyyy/zz] point a
(xx = focus bias yyyy = C1error)
4 UP Adjust "yyyy" to 220*
5 PLAY [b=xx yyyy/zz] point b
6 DOWN Adjust "yyyy" to 220*
7 PLAY [xx yyyy/zzc=] point c
Check "yyyy" within 50
8 PLAY Display shows [aa bb cc(xx)] focus bias adjust
(aa = point a, bb=b, cc=c )
Notes:
1. The relation between the C1 error and focus bias value is shown in the figure below. Points "a" and "b" in the
figure are detected by the above adjustment. Focal position "C" is automatically obtained from points "a" and “b”
by calculation.
2. The C1 error rate fluctuates. Therefore, perform the adjustment according to the observed mean value.
9 Error Rate Check
1. CD Error Rate
No. Key Display/Function
1 MULTI JOG [CPLAY MODE]
2 Load the test disc (TGYS-1)
3 PLAY Display shows [CPLAY MID]
Access and
[c=xxxx a=yy] xxxx=C1 error (lower 20) yy = AIDP error
4 ST OP [CPLAY MODE]
5 EJ ECT Unload disc.
2. MO Error Rate
No. Key Display/Function
1 MULTI JOG [CPLAY MODE]
2 Load the recordable disc
3 PLAY Display shows [CPLAY MID]
Access and
[c=xxxx a=yy] xxxx=C1 error (lower 50) yy = AIDP error (00)
4 ST OP [CPLAY MODE]
5 EJ ECT Unload disc.
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