Fujitsu AUXB04GALH Service Manual page 185

SERVICE PARTS INFORMATION 4
Inverter PCB
Filter PCB
Power PCB
Check Diode Bridge
(1) Check Circuit of Diode Bridge (After removing)
Refer to the Service parts information 11
OK
Check Wire unplugged and lose screw Filter PCB -> DB -> Reactor -> Power PCB -> Inverter PCB
(2) Check the wire connection
If there is unplugged wire, connect the wire.
NO
Check Resistance on the Power PCB
(3) Check the following items.
-1. The circuit between R801 and R804 is open-circuit
-2. The K801 is short-circuit
-3. R806 is open-circuit or short-circuit
NO
Electric parts check
Is the reactor Assy defective?
Check th e reactor (Refer to the parts information 6)
OK
Check Inverter PCB -4
(4) Disconnect the connection wires (7-pin connector)
between the Inverter PCB - Main PCB.
(5) Is there a short between Inverter PCB side connector pins 1-2 ?
NO
Check Inverter PCB -5
(6) Disconnect the connection wires (3-pin connector)
between the Inverter PCB - Filter PCB.
(7) Is there a short between Inverter PCB side connector
pins 1-3 and Filter PCB side connector pins 1-3?
NO
Turn on the power.
(8) Reconnect all the connection wires disconnected up to (1)-(7) to their original places.
(9) Turn on the AC power.
If the LED of the Inverter PCB does not light or blink, replaces the Inverter PCB-Filter PCB.
Filter PCB -> DB -> Reactor -> Power PCB -> Inverter PCB
NG
Replace Diode Bridge
YES
Replace Power PCB
NG
Replace Reactor
YES
Replace Inverter PCB
YES
Inverter PCB side short circuit
Replace Inverter PCB
Filter PCB side short circuit
Replace Filter PCB
04-115