Service manual

MODELS: LT-3280D/LT-3780D
Page 35
Troubleshooting
1.1.
1.1.
1.
Power failurePower failure
Power failurePower failure
Power failure
(1)POWER is turned off.(1)POWER is turned off.
(1)POWER is turned off.(1)POWER is turned off.
(1)POWER is turned off.
Connect the Power plug and turn on the main Power switch (Front switch or remote switch).
Is the POWER LED lighting or blinking?
Is the power plug connected to
the wall outlet correctly?
Connect the power plug
correctly.
NO
YES
Is the 24V output available at
the lead of L9B1?
NO
Is F9G4 broken?
YES
YES
IC700 or peripheral circuit is out of
order. (Pcba-MAIN)
See other trouble guide.
YES
Is all harness on board
connected correctly?
Connect all harness correctly.
NO
Is the S3.3V output available at
the cathode of D9G8?
YES
NO
Pcba-POWER is out of
order.
NO
YES
NO
PD harness is removed after
F9G4 is repaired.
Connect the power plug again.
Is the S3.3V output available at
the cathode of D9G8?
IC9B1 or peripheral
circuit is out of order.
Is the AC-OFF output available at
10pin of PE?
Pin No. Voltage
PE 10 5V pulse
YES
NO
PC9A4 or peripheral
circuit is out of order.
NO
YES
Pcba-MAIN is out
of order.
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(A):In case of the POWER-LED blinking, (B): In case of the POWER-LED lighting.