Sanyo FISHER DVD-1500 Service Manual page 14

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