Mitsubishi SKM32ZA User Manual

113
(7) Inverter failure diagnosis
If the results of the diagnosis in Item (3) indicate that the inverter is defective, perform the following inspection on the inverter.
(a) Diagnosis procedure
Is there approximately DC280V
between
P
1
and
N
1
on the Printed
circuit board (POWER)?
Is there voltage at U, V and W of the power transistor?
Is there output at CNL,CNK on the printed circuit board(CONTROL)?
Is the fuse good?
Is the diode stack(DS1, DS2) good?
Is condenser good?
Fuse is defective
e
Replace
The diode stack is defective
e
Replace
Condenser is defective
e
Replace
The printed circuit board (POWER) is defective
e
Replace
The Printed circuit board (POWER TRANSISTOR) is defective
e
Replace
Is DC280V imposed between the
power transistors P and N
?
The reactor is defective
e
Replace
Is there conductivity in the reactor?
YES
YES
YES
YES
Inspect compressor.
YES
NOYES
NO
NO
NO NO
NO
52X
5
is defective
e
Replace
Is 52X
5
in good condition?
YES
YES
NO
NO
The printed circuit board (CONTROL) is defective
e
Replace
YES
NO
The printed circuit board (POWER) defective
e
Replace
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Mitsubishi SKM32ZA Specifications

General

Brand	Mitsubishi
Model	SKM32ZA
Category	Air Conditioner
Language	English