Outdoor Unit Check Method - IVT AE-X12GR-N Service Manual

AEX12GRN
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.
Needle-type tester Normal resistance value
(-) (+)
∞
P N
(several MΩ)
U
V
W
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
No Item
.
1 Preparation
2 Inverter DC power supply
voltage check
3 IPM circuit check
Check method
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.
Measure DC voltage between IPM
pins (31) and (35).
Check that 3 lamps (load) light.
Check position detection voltage (+15
V, 5 V) on control PWB.
Needle-type tester
(-) (+)
U N
V
W
Values in ( ) are for digital tester.
Normal value/condition
320 VDC
Each voltage should be normal.
All 3 lamps (load) should light with
same intensity.
3 – 10
Normal resistance value
∞
(several MΩ)
Remedy
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.)
Replace control PWB.