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2-2
Disc kind misjudgement
(Initial setting is NG.)
Are FE and SBAD
N
signals for each disc normal?
Y
Check peripheral
circuit of IC601.
Check IC501.
Lens cleaning.
Replace pickup head.
Fig. 1-3-4
DVD single (single-layer) disc
detection waveform
FE signal
Pin150 (TP504) of IC502
SBAD signal
Pin152 (TP506) of IC502
V : 500 mV/div
H : 2 ms/div
Fig. 1-3-6
Check pins 14, 15
and 16 of IC501
serial bus.
Check peripheral
circuits of IC501,
Q501 and Q502.
DVD dual (dual-layer) disc
detection waveform
1.65V
Fig. 1-3-7
1-8
3
Check laser current.
lop
50 mA
Check laser current.
50 mA
lop
lop = Voltage between
E522 and E523/3.3Ω
Y
Check peripheral circuits
of IC501, Q501 and Q502.
Fig. 1-3-5
V : 500 mV/div
H : 2 ms/div
lop
90 mA
90 mA
Check wiring for
pickup head.
Replace pickup
mechanism.
CD disc
detection waveform
V : 500 mV/div
H : 2 ms/div
Fig. 1-3-8
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