Sanyo FISHER DVD-1500 Service Manual page 16

CHECK FLOW AND TROUBLE SHOOTING
(Playing CD) An extract from "GENERAL FLOW"
Two-layer
Layer jump
Pickup moves outward.
Playing CD
Problem/symptom
1 Unplayable (no sound, no picture)
2 Sound skipped
3 No or intermittent sound
4 No sound
Poor playability
Surface shaking, warp
Scratch
5
Finger print
Eccentricity
6 Frequency response characteristics abnormal Check EMPHA.
Turns 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
CD : TOC READ
DVD : CSS processing
DVD
CD
DVD / CD
Check
Is output signal around?
Check waveform.
Is spindle motor waveform normal?
Check DATA.
Check RF waveform (any difference from that of good unit) (2)~(4)
Realignment of mechanism
Check DFTN
DFTN:normally High, When scratched:Low
Check DFTN
DFTN:normally High, When scratched:Low
Check tracking servo.
Is PAUSE stable?
Two-layer completed
CD PLAYBACK
STOP
Waveform
(5)~(10)
(11)~(15),(33)
1,(5)~(10)
(4)~(6)
(11)~(15)
(40)~(43)
(40)~(43)
(11)~(15)
(33)
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Schematic diagram Reference data
D,E
D,E
D,E
D,E
D,E
D,E,H TA1254
D,E,H TA1254
D,E,H
Voltage table (11)