Troubleshooting; Power Troubleshooting - Mitsubishi Electric LT-3280 Service Manual

Troubleshooting

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