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Multi F Four-Way Ceiling Cassette Service Manual

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Part 5. Trouble Shooting
- 78 -
Copyright ©2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
■ 54k
CN(L)_BRWON
CN(L)_BRWON
CN(N)_BLUE
CN(N)_BLUE
U
V
W
U,V,W CONNECTOR
U,V,W CONNECTOR
LED01M
LED01M
LED02M
LED02M
CN(L)_BRWON
CN(N)_BLUE
U
V
W
U,V,W CONNECTOR
LED01M LED02M
1. Wait until inverter PCB DC voltage is discharged after main power off.
2. Pull out CN(L), CN(N) connectors and U,V,W COMP Connector.
3. Set multi tester to resistance mode.
4.
If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged)
5. Set the multi tester to diode mode.
6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged).
27 26 25 24 23 22 21
P U V W Nu Nv Nw
0.4 ~ 0.6 V
27 26 25 24 23 22 21
P U V W Nu Nv Nw
0.4 ~ 0.6 V
PFC_IPM check
U, V, W ‘ R S T