Sanyo FISHER DVD-1500 AU, Service Manual

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Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
DVD / CD
CD
DVD
Internal
circumference
optimization
One-layer or
two-layer
Two-layer
completed
One-layer
Two-layer
completed
Layer jump
CD : TOC READ
DVD : CSS processing
Pickup moves outward.
DVD / CD
External
circumference
optimization
STOP
Two-layer
DVD
CD
PLAYBACK
Measures error rate
Error judgement
Aligns tracking balance.
E
rror judgement
Error judgement
EQB
EQF
OK
NG
OK
NG
OK
NG
Optimization
One-layer or
two-layer
Two-layer
completed
Layer jump
NG
Time out
NG
OK
OK
(DVD external circumference EQ optimisation alignment)
DVD external circumference EQ optimization alignment
Problem/symptom Check Waveform Schematic diagram Reference data
Check for propriety of RF EQ alignment. 3, (35)(38) C
1 Two-layer DVD disk unplayable warp, small 3T, affected by double refraction?
defect, eccentricity, surface shaking?
2 " Check RF waveform. Compare with good unit.
(2)(3)(4)
C
3 " Jumps correctly to 2nd layer? (49)(50) F
4 Error 22 occurs. Check TE waveform. (36)~(38)
CHECK FLOW AND TROUBLE SHOOTING
An extract from "GENERAL FLOW"