Troubleshooting by Remote Controller Si20-701_B
469
(6) Using an analog tester, measure resistance and fill in
the blanks in the following table.
In case of unbalanced resistance for one of the 3
phases in each table (when the resistance value is
equal to 5 times or more than the other resistance
values), the power transistor is broken.
In normal cases, each phase shows a similar
resistance value.
Tester Resistance Tester Resistance
(+) (-) Ω (+) (-) Ω
C+ U C- U ∞
C+ V C- V ∞
C+ W C- W ∞
UC+ ∞ UC-
VC+ ∞ VC-
WC+ ∞ WC-
U
Red
White
Blue
VW
UVW
C+ C-
Outdoor Unit PCB
Comp.
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