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
a
n
d
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
NO
YES
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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