Elektronika SCM60ZD-S Manual page 80

(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 the fuse good?
Is the varistor good?
Is the noise filter good?
Is DC280V imposed between the
power transistor P and N?
Is there output at CNN, CNH on
the printed circuit bord (CPU)?
Is the voltage at U, V and W of
the power transistor?
Inspect compressor
80
NO
Fuse is defective
YES
Varistor is defective
NO
YES
NO
Noise filter is defective
YES
NO
YES
Is there conducitvity in the inductor?
Is the diode stack good?
The printed circuit board
(POWER) is defective
The printed circuit board
NO
(CPU) is defective
YES
NO The power transistor is
defective
YES
e Replace
e Replace
e Replace
NO
Is condenser good?
YES
NO
YES
NO
YES
e Replace
e Replace
e Replace
Condenser is defective
e Replace
Inductor is defective
e Replace
The diode stack is defective
e Replace