Zenith D35, Service Manual

Page: 40 / 156

3-61
Does tray open or close?
Does the pick-up
slide inner or outer
track?
Fig.1. SLED Driver waveform
Fig.2. Focus Driver waveform
Does
the voltage change
at PMD03 Pins7, 8 more than
2V on the basis of
3.8V?
Pressing
the open/close key
repeatedly, check the voltage of IC2M1
Pins14, 15 change
0V to 5V
Does
PMD03 Pin10 change
high to low?
Does
the pick-up lens move up
and down?
Check Focus Driver output.
(IC201 Pin88, IC2M1 Pins37, 38)
Check SLED Driver output.
IC201 Pin80 IC2M1 Pins28, 29.
IC201 Pin80 no output : IC201 is defective
IC2M1 Pins26, 27 no output : IC2M1 is defective
IC201 Pin88 no output : IC201 is defective
IC2M1 Pins37, 38 no output : IC2M1 is defective
DECK assembly is defective.
Slide the pick-up to
inner track.
.Power on
Check loading Part.
Push Pick-up to inner track to
the end by hand.
DECK assembly is defective.
(Limit sw)
check µ-COM Part.
Replace IC2M1.
No disc
B.
END
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES