Xerox 3050 Service Manual page 221

1.2 Main Power Switch Opens
RAP
This R A P i s used to troubleshoot short circuits
from ACH to ACN
.
The problem may occur if the connector
A23P1
is
improperly connected, causing a
short circuit from ACH to ACN at connector
A23 P/J 1.
NOTE: The component locator drawings and
the circuit diagrams are on the following
pages.
A
WARNING
Dangerous Voltage
Do not dlsconnect any plugs or wlres whlle
the power cordis plugged Into the wall and
the main power switch is on.
Procedure
Set the DMM to the
2OK
resistance scale.
Switch off the Main Power and unplug the
power cord. Disconnect the wires from 4A
and
8A
on the Main Power Relay. Connect
the power cord to the A C power. Switch on
the Main Power Switch CB-1.
The Main Power Switch opens.
Disconnect A23P1 and go to FLAG 1 and
check for a short between ACH and ACN.
Look for pinched wires or wires with
frayed insulation. Reconnect the wires
from 4A and 8A on the Main Power
Relay.
The problem is still present.
Y N
A B Return to Section 1 Call Flow.
Disconnect
M22P1 at
the Fuser Drive Go to
FLAG 5
and check for
a
short between
Motor and go to FLAG 2 and check for a ACH and ACN. If no short circuit from ACH
short between ACH and ACN. Look for
to ACN was found replace the Main Power
pinched wires or wires with frayed Switch CB1.
insulation.
If no path from ACH to ACN was found,
disconnect M2lPl at the Druml
Developer Drive Motor and go to FLAG 3
and check for a short between ACH and
ACN. Look for pinched wires or wires
with frayed insulation. If there is no short
circuit reconnect M22P1 and M21P1.
Connect the power cord to the AC
power. Switch on the Main Power
Switch CB-1.
The problem
is still
present.
Return to Section 1 Call Flow.
I N
Go to the 4.1 Drum/ Developer Motor
R A P and check for
a
shorted motor. If
the problem i s still present, Go to the
4.2
Fuser Motor R A P and check for a shorted
motor.
Disconnect the wires from 40 and 8B on the
Main Power Relay. Switch on the Main
Power Switch
CB-1.
The Main Power Switch
opens.
N
Disconnect A4P1 at the 26 V D C Bulk
Power Supply and go to FLAG 4 and
check for a short between ACH and ACN.
If no short circuit from ACH to ACN was
found reconnect 4B and 8 B on the Main
Power Relay and replace the 26 V D C Bulk
Power Supply.
3/93
3050
2-129
1.2 Main Power Switch Opens
RAP