Table of Contents
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CHECK FLOW AND TROUBLE SHOOTING
(Automatic
alignment
block)
An extract from "GENERAL FLOW"
'L
'L
I
Laye
Identifies
disk
Sets mode
+
INIT processing of TC9461
+
Laser off 20 ms
Tracking balance alignment
1
Rotates at a speed of twice that of CD.
100ms wait
I
J
Turns on laser.
I
Focus search
Automatic alignment
Tracking balance
Focus balance
Focus gain
Tracking gain
RF gain
+
DVD I CD
DVD
Internal circumference
optimization
*
DVD
a
Sets to normal speed.
TRACKING
ON
100ms wait
SLED OFF
I ADRESS CHECK \
+
,
t
Automatic alignment block
Problem/symptom
Check
Waveform
Schematic diagra Reference data
Focus unstable
focus servo system.
(24)-(27)
F
1
Susceptible
to shock
Check for signal flow
Oscillatory noise from pickup
Check for signal flow
Squeaky noise while pickup is traveling
If not rotating with board, pickup need be analyzed.
Excessively long time taken for alignment
tracking servo system.
(20)-(23)
G, H
2
Susceptible
to shock
Check for signal flow
Oscillatory noise from pickup
Check for signal flow
Squeaky noise while pickup is traveling
If not rotating with board, pickup need be analyzed.
Check RF level.
(2)(3)(4)
C, D, E
3
Unable to alignldisk error
Laser deteriorated? (Check laser current:R51 00)
Check for dirt on lens
4
Long time taken for alignment
Check FWD.
I
Voltage table (2)
L
-12-
,
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Table of Contents
Troubleshooting
