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(4)
Disconnect between
SDM and Y-SUS
Measure of SDM power line
resistor (A1-A2, B1-B2,
C1-C2, D1-D2)
Does SDM power
supply line short?
N
(5)
A1
A2
Y
N
Turn off the
AC power.
B1
B2
-29-
SDM is defective.
(Panel chassis is
defective.)
SDM chip operation is abnormal.
Turn on AC power.
Y
PSU board
Vs (85V) and Vcc
(5V) exist?
C1
C2
Turn off the AC
power.
D1
D2
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