Fujitsu AMUG24LMAS Service Manual page 54

Troubleshooting 1
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OK
Check Point 3 : Check voltage of power supply
Check the voltage of power supply
>> Check if AC187V (AC208V-10%) - 253V (AC230V+10%) appears
at outdoor unit terminal L1 - L2.
OK
Check Point 4 : Check serial signal (Reverse transfer signal)
Check serial signal (Reverse transfer signal)
>> Check if indicated value swings between AC90V and AC270V at outdoor unit terminal 1 - 3.
>> If it is abnormal, Check the parts as follows.
- Outdoor unit fan motor
- Active filter module
- Transistor PCB (IPM)
- Filter PCB (Check the wire of CN110 : AOU24/30RGLX
>> If Outdoor fan motor is abnormal, replace outdoor unit fan motor and main PCB.
>> If Active filter module or IPM is abnormal, replace it.
>> If the parts are normal, replace main PCB.
BLACK
WHITE
RED
BLACK
WHITE
(Parts information 4)
(Parts information 5)
(Parts information 6)
CN201 : AOUG36/48LMAS1)
1
2
3
L1
L2
+
-
03-06