Mitsubishi SRK63ZEA-S1, Technical Manual

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(10) Inverter failure diagnosis
If the results of the diagnosis in Item (7) indicate that the inverter is defective, perform the following inspection on the inverter.
(a) Diagnosis procedure
Is the fuse good?
Is the varistor good?
Fuse is defective
e
Replace
Varistor is defective
e
Replace
YES
YES
NO
NO
Is the noise filter good?
Noise filter is defective
e
Replace
YES
NO
Is DC280V imposed between the
power transistor P and N?
Is there output at CNG, CNH on
the printed circuit bord (CPU)?
Is the voltage at U, V and W of
the power transistor?
Is the diode stack good?
Is condenser good?
Is there conducitvity in the inductor?
The printed circuit board
(CPU) is defective
e
Replace
The printed circuit board
(POWER) is defective
e
Replace
The power transistor is
defective
e
Replace
YES
YES
YES
YES
Condenser is defective
e
Replace
Inductor is defective
e
Replace
The diode stack is defective
e
Replace
YES
NO
NO
NO
NO
NO
NO
YES
Inspect compressor