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Power source system 1
LED is not lit.
(The product does not
enter the stand-by mode.)
Has the
FUSE (F900) blown?
YES
Is the lead wire to
the PB and RB
connector cut?
YES
Is the pin No. 3
of the RD
connector 5V?
YES
Is the lead wire to
the KT and J13
connector cut?
YES
Malfunction of PCB-DMD.
Using the shielding case as GND is allowed when checking the voltage waveform or terminal voltage on the secondary side.
Check the failure on the PCB-
NO
POWER, then replace the parts
such as D900, Q900, etc.
NO
Replace the lead wire.
Remove the
SD connector
NO
from the PCB-
MAIN.
Malfunction of the PCB-SIGNAL
Replace the lead wire.
NO
Replace the PCB-KEY.
NO
Is the pin No. 3
of the RD
connector 5V?
YES
- 2 -
Check the circuit around IC950
and IC9A1, then replace the
parts. (specially, Z9A0)
IC950 : Primary side SW-IC
IC9A1 : Secondary side feedback IC
Z9A0 : Circuit protector
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