Carrier 38MARBQ12AA1 Service Manual page 58

IPM Continuity Check
1. Turn off the outdoor unit and disconnect the power supply.
2. Discharge the electrolytic capacitors and ensure all energy has been discharged.
3. Dissemble the outdoor PCB or dissemble the IPM board.
4. Measure the resistance valve between P and U(V,W,N); U(V,W) and N.
Digital Tester
(+) Red
P
58
WARNING
ELECTRICAL SHOCK HAZARD
Electricity remains in the capacitors even when the power is
off.
Ensure the capacitors are fully discharged before
troubleshooting.
Resistance Valve
(-) Black
N

U
(Several M
V
W
Fig. 45 — Testing
Specifications subject to change without notice.
Digital Tester
(+) Red
U
V

)
W
-
Resistance Valve
(-) Black

(Several M
N
SG-38MARB-01

)