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

Trouble shooting 64

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 AC380V appears at Outdoor Unit Terminal R-S, S-T, T-R, and AC220V at R-N, S-N, T-N.
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
Replace the Main PCB.
(Refer to 06-03 page Main PCB removal.)
NG
If the symptom does not change,
Check voltage of "CN125 pins 1-3" on the Main PCB. (DC 5V)
OK
For 8HP and 10HP models, advance to [OK] without checking.
For 12HP, 14HP and 16HP models, disconnect connecting cable of
the PWB Unit(CT) and Main PCB and recheck.
Recheck voltage of "CN125 pins 1-3" on the Main PCB. (DC 5V)
OK
Replace the Pressure sensor
OK
If the symptom does not change by above Check 3, replace Main PCB or Filter PCB (Main).
>>If replace Main PCB, Refer to 06-03 page Main PCB removal.
Forecast of Cause :
1. Power Supply failure 2. Outside cause 3. Electrical Components defective
NG
Replace the Filter PCB(Main).
NG
NG
Replace the PWB Unit (CT)
NG
04-71
AC
OK
OK
NG
NO