Carrier 42QZA009DS-1 Service Manual page 93

3. IPM continuity check
Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital
tester to measure the resistance between P and UVWN; UVW and N.
Digital tester
(+)Red (-)Black
P
Normal resistance value
N
∞
U
(Several MΩ)
V
W
Digital tester
(+)Red (-)Black
U
V
N
W
(+)Red
90
Normal resistance value
∞
(Several MΩ)