Check
SiMT041311E
189
Service Diagnosis
3.12 Outdoor Fan System Check
Check No.19
DC motor
3.13 Main Circuit Short Check
Check No.20
Note:
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.
(R19395)
YES
NO
NO
YES
Outdoor fan
system is
functioning.
Check the outdoor fan system.
Reconnect the connector.
Outdoor fan running?
Fan motor
lead wire connector
disconnected?
Go to
Check No. 16
.
Negative (–) terminal of multimeter
(positive terminal (+) for digital
multimeter)
~
(2, 3)
+
(4)
~
(2, 3)
–
(1)
Positive (+) terminal of multimeter
(negative terminal (–) for digital
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
∞
(R19736)
Multimeter
–~
~
+
1
2
3
4
–
+
