Main Circuit Short Check - Daikin FTXM-K Series Service Manual

Check

5.12 Main Circuit Short Check

Check No.20 Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is
approximately 0 V before checking.
Positive terminal (+) of
digital multimeter
Negative terminal (–) of
digital multimeter
Resistance is OK.
Resistance is NG.
20/25/35 class
42/50 class
105
Measure the resistance between the pins of the DB1 referring to the table below.
∞
If the resistance is or less than 1 kΩ, short circuit occurs on the main circuit.
4
3
2
Multimeter
1
~ +
(2, 3) (4)
+ ~
(4) (2, 3)
several kΩ ~ several MΩ
0 Ω or
SiBE041434E
–
~
(1)
(2, 3)
– ~
(1)
(2, 3)
∞
1
Multimeter
2
3
4
(R19933)
(R21203)
Service Diagnosis