Active Filter Failure - Fujitsu AS*9LSACW Service Instructions Manual

Active Filter Failure

[Checking points]
Check the following points and locae the cause in the outdoor unit.
[Cause]
(1) Incorrect wiring
(2) Active Filter Module defective
(3) PC Board defective
(4) DC voltage detectiion circuit defective
[First Step]
Measure the DC voltage at terminals (between Electrolytic Capacitor and discharge resistance)
in the Inverter Controller Assy, and make sure it is lower than DC5V.
If it is higher than 5V, wait until the discharging is over.
Check point (1)
Open the Inverter Controller Assy
and check if there is abnormal points.
(Incorrect wiring, Parts touched, Parts broken)
Go to Check point (2)
Check point (2)
Turn on the power and press TEST button
on Remote Control.
Is the outdoor fan rotating?
Go to Check point (3)
Check point (3)
Operate the unit for certain time and
measure the terminal voltage of the
discharge resistance.
Is the DC voltage between 350 to 425V?
The unit is normal.
Recheck
Operate the unit for certain time and
check if the compressor is operating.
No(Abnormal)
Yes(Normal)
Yes(Rotating)
Yes(Within range)
Yes(Operating)
No(Not operating) >
Incorrect wiring > Correct and recheck
Parts touched > Correct and recheck
Parts broken
No(Not rotating)
ACTPM or PCB defective > Replace Main PCB
No(Out of range)
ACTPM or PCB defective > Replace ACTPM or
(Replace only ACTPM if Main PCB was replaced
at Check point (2).)
> Check completed
Return to the start
07-10
> Change the broken part
Main PCB.