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Si01-406
Check
Service Diagnosis
121
5.10
Power Transistor Check
Check No.13
Note:
Check to make sure that the voltage between the terminal of Power transistor (+) and (-) is
approx. 0 volt before checking power transistor.
< Measuring method >
Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
connector, press the protrusion on the connector.
Then, follow the procedure below to measure resistance between power transistor (+) and (-)
and the U, V and W terminals of the compressor connector with a multi-tester. Evaluate the
measurement results for a pass/fail judgment.
<Power transistor check>
<Measuring positions>
Negative (-) terminal of
tester (positive terminal
(+) for digital tester)
Power transistor
(+)
UVW
Power transistor
(-)
UVW
Positive (+) terminal of
tester (negative terminal
(-) for digital tester)
UVW
Power transistor
(+)
UVW
Power transistor
(-)
Normal resistance
Several k
Ω
to several M
Ω
(
∗
)
Unacceptable resistance
Short (0
Ω
) or open
MULTIMETER
(DC, VOLTAGA RANGE)
DB1
TRM1
S90 THERMISTOR LEAD WIRE
S80 FOUR WAY VALVE LEAD WIRE (Heating Pump only)
S70 FAN MOTOR LEAD WIRE
REACTOR LEAD WIRE
COMPRESSOR LEAD WIRE
(R2956)
Summary of Contents for FT25CV1A
Page 7: ...Si01 406 vi Table of Contents...
Page 15: ...Functions Si01 406 4 List of Function...
Page 21: ...Specifications Si01 406 10 Specifications...
Page 205: ...Wiring Diagrams Si01 406 194 Appendix...
Page 209: ...Si01 406 iv Index...