Check
SiBE041102_A
94
Service Diagnosis
5.11 Main Circuit Short Check
Check No.20
Note:
Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
0 V before checking.
Measure the resistance between the pins of the DB1 as below.
If the resistance is
∞
or less than 1 k
Ω
, short circuit occurs on the main circuit.
5.12 Power Module Check
Check No.22
Note:
Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx.
0 V before checking.
Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the
connector, press the protrusion on the connector.
Follow the procedure below to measure resistance between the terminals of the DB1 and
the terminals of the compressor with a multi-tester. Evaluate the measurement results for a
judgment.
(–) terminal of the tester
(in case of digital,
(+) terminal)
~
(2, 3)
+
(4)
~
(2, 3)
–
(1)
(+) terminal of the tester
(in case of digital,
(–) terminal)
+
(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
∞
(R14597)
Tester
–~
~
+
1
2
3
4
–
+
Negative (–) terminal of
tester (positive terminal
(+) for digital tester)
DB1 (+)
UVW
DB1 (–)
UVW
Positive (+) terminal of
tester (negative terminal
(–) for digital tester)
UVW
DB1 (+)
UVW
DB1 (–)
Resistance is OK.
several k
Ω
~ several M
Ω
Resistance is NG.
0
Ω
or
∞
