Fujitsu AUXB04GALH Service Manual page 184

SERVICE PARTS INFORMATION 4
Inverter PCB
Filter PCB (INV)
Check Filter PCB (INV) -1
(1) Using a tester, measure the resistance value of both ends
of the fuses (P501/502/503). (*Cannot be checked visually)
Are Fuses (60A/450V) open?
YES
Check Filter PCB (INV) -2
PCB pattern and parts on PCB defective?
NO
Check Filter PCB (INV) -3
(2) Replace blown fuse.
(3) Disconnect all the connection wires between
the Filter PCB (INV) - diode bridge.
(4) Is there a short between L1-L2, L2-L3, and L1-L3?
NO
Electric parts check
Are the following parts defective?
*For the check method, refer to 6-5.
3-phase diode bridge
Resistor, Cement (Surge prevention/ Balance)
Magnetic Relay
Inverter compressor reactor
Capacitor
Reactor
NO
Check Inverter PCB -1
(5) Disconnect the connection wires between
the Inverter PCB - electrolytic capacitor.
(6) Is there a short between the wires of step (5)?
NO
Check Inverter PCB -2
(7) Disconnect the connection wires (8-pin connector)
between the Inverter PCB - Main PCB.
(8) Is there a short between Inverter PCB side connector
pins 1-2?
NO
Check Inverter PCB -3
(9) Disconnect the connection wires (3-pin connector)
between the Inverter PCB - Filter PCB(INV).
(10) Is there a short between Inverter PCB side connector
pins 1-3 and Filter PCB(INV) side connector pins 1-3?
NO
Turn on the power.
(11) Reconnect all the connection wires disconnected up to (1)-(10) to their original places.
(12) Turn on the AC power.
If the LED of the Inverter PCB does not light or blink, replaces the Inverter PCB-Filter PCB(INV).
NO
YES
Replace Filter PCB (INV)
YES
Replace Filter PCB (INV)
YES
Replace defective electric parts.
YES
Replace Inverter PCB
YES
Replace Inverter PCB
YES
Inverter PCB side short
Replace Inverter PCB
Filter PCB(INV) side short
Replace Filter PCB(INV)
04-108