Error
Description
Diagnostic Action
Power
Supply
Check
5.
Measure the +24 Vdc (use ground pin on
the Driver Circuit card).
Pin no.
Min.
voltage
Max
voltage
CN3-18
+21.6 Vdc
+26.4 Vdc
Is
+24 V dc within range?
YES: Power supply checks good.
NO: Go
to
step
6.
6.
Measure dc voltages (on 60-volt scale) on
pins
CN6-1
and CN6-210cated on Control
Circuit card (use the dc ground pin
on
the
driver circuit card for common lead). Find
the difference in the two readings.
Is
the difference 0.5 to 0.9 Vdc?
YES: Replace
both
control cards (see
Section 3, "Removal/Replacement").
NO: Replace the heat sink/power
transistor assembly (see Section 3,
"Removal/Replacement").
,,-...,
1400-10
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