AEX12GRN
3 – 10
5. IPM check method
Turn off the power, let the large capacity electrolytic capacitor (C10) discharge completely, and dismount the IPM. Then, using a tester, check leak
current between C and E.
When using a digital tester, the (+) and (-) tester lead wires in the table must be reversed.
Values in ( ) are for digital tester.
5.1. IPM internal circuit diagram
[7] OUTDOOR UNIT CHECK METHOD
After repairing the outdoor unit, conduct the following inspection procedures to make sure that it has been repaired completely. Then, operate the
compressor for a final operation check.
1. Checking procedures
Needle-type tester Normal resistance value
(-) (+)
PN∞
(several MΩ)
U
V
W
Needle-type tester Normal resistance value
(-) (+)
UN∞
(several MΩ)
V
W
No
.
Item Check method Normal value/condition Remedy
1 Preparation Disconnect compressor cords (white,
orange, red: 3 wires) from compres-
sor terminals, and connect simulated
load (lamp used as load).
Operate air conditioner in cooling or
heating test operation mode.
2 Inverter DC power supply
voltage check
Measure DC voltage between IPM
pins (31) and (35).
320 VDC Replace control PWB.
Replace diode bridge.
Correct soldered section of Fas-
ten tabs (T1, T2, T5 - T3) on con-
trol PWB and IMP (S, C, R).
(Repair solder cracks.)
3 IPM circuit check Check that 3 lamps (load) light.
Check position detection voltage (+15
V, 5 V) on control PWB.
Each voltage should be normal.
All 3 lamps (load) should light with
same intensity.
Replace control PWB.
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