Fujitsu AUXB04GALH Service Manual page 160

Trouble shooting 74
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 Design ta & 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 AC342 - 456V appears at Outdoor Unit Terminal L1-L2, L2-L3, L3-L1.
OK
Check the fuse on the Filter PCB(Main).
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(Main) and Main PCB and recheck.
if the power supply terminals section is not shorted.
(Note) Always check in the power off state.
OK
Disconnect the connector for the AC power input
devices and check short circuit on power input cable
one by one.
- Solenoid valve, 4 way valve, Heater, Mg-Relay -
NG
Replace the defective device
Check short circuit on EEV's internal circuit
Disconnect EEV from Main PCB, and check the short circuit of EEV internal circuit.
Check Short circuit ( 0 Ohm) between pin No.1 and other pin No..
NG
Replace the defective device
NG (No DC5.0V)
Replace Main PCB
OK (No Short Circuit 0 Ohm)
Forecast of Cause :
1. Power Supply failure 2.Outside cause 3.Electrical Components defective
Replace the Filter PCB
OK
OK
Check DC (5.0V) circuit on CN118
Check DC voltage 5.0 V between pin No.1 and pin No.3
OK
Check Pressure Sensor open / short after remove
Transmission PCB from the Main PCB
04-84
AC
OK
OK
NG
DC
Replace the Pressure sensor
NG ( Open Circuit )
NO