Lt-30Xx Power Troubleshooting - Mitsubishi Electric LT-2220 Service Manual

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050
1.2 In case of LT-30XX
(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 lit?
YES
· To "Flashing in green"(2)
· To "Flashing in amber"(3)
NO
Is the power plug connected
to the wall outlet correctly?
YES
Is all harness connected
correctly?
YES
Is the 24V and 8.5V output
available at Pin2(8.5V) and
Pins 4, 6(24V) of the J810
connector? (VH connector)?
Pin No.
8.5V 2
24V 4, 6
* Voltage range of 8.5V :8.1~8.8V
* Voltage range of 24V :22~26V
YES
Is the S5V and S3.3V, AD3.3V output
available at Pin12(S5V) and Pin13
(S3.3V) of J303 and at Pin6 of J190
(PH connector)?
CN
S5V J303
S3.3V J303
AD3.3V J190
YES
IC300 and peripheral circuits
are out of order.(PWB-MAIN)
NO
Poor power plug connection.
All harness connects
correctly.
NO
Is the IN_24V output
3Vdc at Pin8(24V) of the J810
connector? (VH connector)
If not outputting, IC300 or its
Periphral circuits is out of
Voltage
order.(PWB-MAIN)
8.5Vdc
If outputting, Power unit is
24Vdc
out of order.
NO
Pin No. Voltage
12 5Vdc
13 3.3Vdc
6 3.3Vdc
Power supply circuit
which generates S5V
and S3V and AD3.3V in
the PWB-SUB(SET) is
out of order.