Main Pcb - Fujitsu AUXB04GALH Service Manual

SERVICE PARTS INFORMATION 3
Main PCB
Filter PCB
Check Fuse on the Main PCB
Is Fuse open?
YES
Check Main PCB -1
(1) Connect all the connection wires between the Filter PCB - Main PCB disconnected at step (2).
(2) Is there a short between L1, L3-N?
NO
Check Electric parts
Is the reactor Assy defective?
Check the reactor (Refer to the parts information 6)
NO
Check Main PCB -2
(3) Disconnect the wires of the pressure sensors (high pressure/low pressure) connected to the connector of the Main PCB.
(4) Is there a short between pins 1-3 of the Main PCB side connector?
NO
Check pressure sensors (high pressure/low pressure)
Pressure sensor check. (Refer to Service parts information 15)
Check Main PCB -3
(5) Disconnect the Main PCB side connector of
the connection wires (8-pin connector) between the Main PCB - Inverter PCB.
(6) Is there a short between pins 1-2 of the Main PCB side connector (8 pins)?
NO
Turn on the power.
(7) Reconnect all the connection wires disconnected up to (1)-( 6) to their original places.
(8) Turn on the AC power.
If the LED of the Main PCB does not light or blink, replaces the Main PCB.
YES
YES
04-114
YES
Replace Main PCB
Replace Reactor
YES
Replace Main PCB
Replace Main PCB