Outdoor Unit - No Power - Fujitsu Airstage J-II Service Manual

Trouble shooting 50

Outdoor Unit - No Power

Check Point 1 : Check Installation Condition
Isnt the breaker down?
Check loose or removed connection cable.
>>If abnormal condition is found, correct it by referring to
Installation Manual or Data & Technical Manual.
OK
Check Point 2 : Check Outside Cause such as Voltage drop or Noise
Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line (Neon bulb or electric equipment that may
cause harmonic wave).
Check the complete insulation of grounding.
OK
Check Point 3 : Check Electrical Components
Check the voltage of power supply.
>> Check if the reted voltage appears at Outdoor Unit Terminal L - N
OK
Check the fuse on the Filter PCB.
NG
Replace the fuse.
Recheck if the power supply terminals section is shorted.
(Note) Always check in the power off state.
NG
Disconnect connecting cable of the Filter PCB and Main PCB and recheck.
if the power supply terminals section is not shorted.
(Note) Always check in the power off state.
OK
Check If the FAN motor PCB has a
damage or not. ( Check short circuit )
OK
Check if the circuit between pin No. 1 and pin No.2
of CN102 / CN150 on the Main PCB has short circuit
or not ( Short circuit : NG )
* Disconnect FAN motor when check the circuit
NG
Replace the Inverter PCB
NG
If the symptom does not change by above Check 3, replace Main PCB or Filter PCB
Forecast of Cause :
1. Power Supply failure 2. Outside cause 3. Electrical Components defective
Replace the Filter PCB.
NG
Replace the FAN Motor
AC
NG
NG
04-59
NO