Fujitsu AB* A12GATH, Service Manual

Page: 183 / 241

SERVICE PARTS INFORMATION 3
Main PCB
Filter PCB (Main)
Check Filter PCB (Main) -2
Check Filter PCB (Main) -1
Check Filter PCB (Main) -3
Replace Main PCB
Replace Main PCB
YES
YES
Check Main PCB -1
Replace Filter PCB (Main)
Replace Filter PCB (Main)
NO
YES
YES
Electric parts check
NO
Replace defective electric parts
YES
PCB pattern and parts on PCB defective?
Is Fuse (5A/ 250V) open?
(1) Replace blown fuse.
(2) Disconnect all the connection wires between the Filter PCB (Main) - Main PCB.
(3) Is there a short between L1-N, L3-N, and L1-L3?
(4) Connect all the connection wires between the Filter PCB (Main) - Main PCB
disconnected at step (2).
(5) The same as step (3), is there a short between L1-N, L3-N, and L1-L3?
(6) Are the following parts defective?
*For the check method, refer to 6-5.
- EEV
- SV
- 4-way valve
- Pressure sensor (High pressure/ Low pressure)
Check Main PCB -3
NO
NO
Check Main PCB -2
YES
(7) Disconnect the wires of the pressure sensors(High pressure/ Low pressure)
connected to the connector of the Main PCB.
(8) Is there a short between pins 1-3 of the Main PCB side connector?
(9) Is there a short between pins 1-6 of CN161?
Replace Main PCB
YES
Replace Main PCB
YES
NO
NO
NO
NO
Check Main PCB -4
(10) Disconnect the Main PCB side connector of the connection wires
(8-pin connector) between the Main PCB - Inverter PCB.
(11) Is there a short between pins 1-2 of the Main PCB side connector (8 pins)?
Turn on the power.
(14) Reconnect all the connection wires disconnected up to (1)-(13) to their original places.
(15) Turn on the AC power.
If the LED of the Main PCB does not light or blink, replaces the Main PCB, Filter PCB (Main).
Replace Main PCB
YES
NO
Check Main PCB -5
(12) Disconnect the Main PCB side connector of the connection wires
(6-pin connector) between the Main PCB - Fan driver PCB.
(13) Is there a short between pins 1-2 of the Main PCB side connector (6 pins)?
04-107