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
∞
U
C+
∞
U
C-
V
C+
∞
V
C-
W
C+
∞
W
C-
U
Red White Blue
V
W
U
V
W
C+
C-
Outdoor Unit PCB
Comp.