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Automatic alignment block
Problem/symptom
Check
Waveform Schematic diagram
Reference data
Focus unstable
focus servo system.
(24)~(27)
F
1
Susceptable to shock
Check for signal flow
Oscillatory noise from pickup
Check for signal flow
Squeaky noise while pickup is travelling
If not rotating with board, pickup need be analyzed.
Excessively long time taken for alignment
tracking servo system.
(20)~(23)
G, H
2
Susceptable to shock
Check for signal flow
Oscillatory noise from pickup
Check for signal flow
Squeaky noise while pickup is travelling
If not rotating with board,pickup need be analyzed.
Check RF level.
(2)(3)(4)
C, D, E
3
Unable to align/disk error
Laser deteriorated? (Check laser current:R5100)
Check for dirt on lens
4
Long time taken for alignment
Check FWD.
I
Voltage table (2)
(Automatic alignment block)
CHECK FLOW AND TROUBLE SHOOTING
An extract from "GENERAL FLOW"
Identifies disk
Sets mode
INIT processing of TC9461
Laser off 20 ms
Turns on laser.
Focus search
Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
DVD / CD
DVD
Internal circumference
optimization
One-layer or
two-layer
Two-layer
completed
One-layer
Layer jump
Two-layer
Tracking balance alignment
Rotates at a speed of twice that of CD.
100ms wait
DVD / CD
CD
DVD
Sets to normal speed.
TRACKING ON
SLED OFF
100ms wait
200ms wait
ADRESS CHECK
Focus balance alignment
Focus gain alignment
Tracking gain alignment
SLED ON
RF gain alignment
Содержание FISHER DVD-1500 AU
Страница 42: ... 55 MPEG P W BOARD CHECK WAVEFORM 1 2 3 4 5 6 Indicate each signaling in schematic diagram of MPEG P 58 ...
Страница 44: ... 57 MPEG P W BOARD CHECK WAVEFORM 8 9 10 11 12 ...
Страница 65: ... 82 WIRING DIAGRAM DVD A SIDE ...
Страница 66: ... 83 WIRING DIAGRAM DVD B SIDE ...
Страница 67: ... 86 WIRING DIAGRAM MPEG A SIDE for AU ...
Страница 68: ... 87 WIRING DIAGRAM MPEG B SIDE for AU ...
Страница 69: ... 90 WIRING DIAGRAM MPEG A SIDE for US ...
Страница 70: ... 91 WIRING DIAGRAM MPEG B SIDE for US ...
Страница 72: ... 97 AMP for AU WIRING DIAGRAM AMP AMP for US ...
Страница 74: ...SANYO Technosound Co Ltd Osaka Japan Jun 00 2550 BB Printed in Japan ...