Sanyo FISHER DVD-1500 AU, Service Manual

Page: 14 / 74

- 13 -
(DVD internal circumference EQ optimization alignment)
DVD internal circumference EQ optimization alignment
Problem/symptom Check Waveform Schematic diagram Reference data
Check for propriety of RF EQ alignment. 3, (35)(38) C Voltage table
1 DVD disk unplayable Warp, small 3T, affected by double refraction? (1)
Defect, eccentricity, surface shaking?
2 DVD disk unplayable Check RF waveform. Compare with good unit. C
(2)(3)(4)
CHECK FLOW AND TROUBLE SHOOTING
An extract from "GENERAL FLOW"
Turn on laser.
Focus search
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
DVD / CD
CD
DVD
Measures error rate
Error judgement
Aligns tracking balance
ERR. 判定
Error judgement
Error judgement
Error judgement
EQB
EQF
Aligns tracking balance
TIME OUT : ERR.
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
Optimization
One-layer
or two-layer Two-layer
completed
One-layer Two-layer completed
Layer jump
Two-layer
CD