Toshiba SD-2050, Service Manual

Page: 58 / 125

Disc kind misjudgement
(Initial setting is NG.)
Replace pickup head.
Lens cleaning.
Check IC502.
Are FE and RFSB
signals for each disc normal?
Check peripheral
circuit of IC604.
2-2
Y
N
Check laser current.
Check laser current.
50 mA lop 90 mA
Check pins 14, 15
and 16 of IC502
serial bus.
Check peripheral
circuits of IC502,
Q501.
lop = Voltage between
(E534 and E536)/10
W
Replace pickup
mechanism.
Check wiring for
pickup head.
Check peripheral circuits
of IC502, Q501.
lop 90 mA
lop 50 mA
3
Y
Fig. 1-3-4
Fig. 1-3-5
DVD single (single-layer) disc
detection waveform
FE signal
Pin150 (TP405) of IC401
RFSB signal
Pin152 (TP503) of IC401
1.65V
V : 500 mV/div
H : 2 ms/div
DVD dual (dual-layer) disc
detection waveform
V : 500 mV/div
H : 2 ms/div
CD disc
detection waveform
V : 500 mV/div
H : 2 ms/div
Fig. 1-3-6 Fig. 1-3-7 Fig. 1-3-8