Appendix A
65
6.9 Diode bridge short circuit check procedures
6.9.1 Power transistor check for ARXN/RXN25/35L/M
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>
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
6.9.2 Main circuit short check for RXN50/60M
Check to make sure that the voltage between (+) and (-) of the diode bridge (DB1) is approximately
0 V before checking.
• Measure the resistance between the pins of the DB1 referring to the table below.
• If the resistance is
∞
or less than 1 kW, short circuit occurs on the main circuit.
Negative (-) terminal of
multimeter
- (2, 3)
+ (4)
- (2, 3)
- (1)
Positive (+) terminal of
multimeter
+ (4)
- (2, 3)
- (1)
- (2, 3)
Resistance is OK
Several k
Ω
~
several M
Ω
∞
∞
Several k
Ω
~
several M
Ω
Resistance is NG
0
Ω
or
∞
0
0
0
Ω
or
∞
*Remark:
1. Use opposite sign of terminal for digital multimeter for measurement.
4
+
3
~
2
~
1
–
Multimeter
Summary of Contents for ARXN25MV1B
Page 1: ...SERVICE MANUAL Inverter DOO 0RXQWHG Single Split SM 5WMY A1 R410A ...
Page 60: ...Wiring Connection 54 4 0 Wiring Connection Model ATXN FTXN 25 35L M ARXN RXN 25 35L M ...
Page 61: ...Wiring Connection 55 Model ATXN FTXN 50 60L ARXN RXN 50 60L ...
Page 62: ...Wiring Connection 56 Model ATXN FTXN 50 60M ARXN RXN 50 60M ...