Xerox 3050 Service Manual page 242

1.6 Ground Fault (WI TAG1
MOD 12) RAP
(1 2 1 1 5/97)
This RAP is used to locate and repair ground
faults in the primary A C power distribution
circuitry. You may have been directed to this
RAP from another A C power RAP that traced
the loss of AC power t o the GFP device.
The 3050 copier is equipped with a Ground
Fault Protection (GFP) device (Tag/ MOD 12),
that detects excessive current leakage to
ground. If excessive leakage is detected the
GFP device will remove all power to the
copier.
Initial Actions
Check that the correct voltage is being
applied to the copier at the wall
outlet.
Procedure
DANGEROUS VOLTAGE.
0
Do not disconnect any plugs or wires while
the power cord is plugged into the wall
outlet and the Main Power Switch is On (1).
The Ground Fault Protector
is
in the tripped
Position (red flag is not up).
Go to FLAG 1 and check that the correct
voltage is present. The voltage is correct.
Y N
I
Replace the Ground Fault Protector
(PL 1.2).
Go to the 1.1 A C Power RAP.
A
Refer t o FLAG 1 and disconnect the wires at
the input to the Line Filter (FL1). Test the
G F P according to the Warning Label. The G F P
passes the test.
Y N
I
Replace the GFP (PL 1.2).
Connect the GFP device to the Line Filter.
The G F P is in the tripped Position (red flag is
not up) after the Main Power Switch is
switched on.
Y N
I Go to the 1.1 A C Power RAP.
Go to FLAG 2 and disconnect the Line Filter
wires at terminals 3 and 4.
The G F P is in the tripped Position (red flag is
not up) after the Main Power Switch is
switched on.
Y N
Connect the wires to the Line Filter. Go
to FLAG 3 and disconnect the wires at
the Main Power Relay (K1). The G F P is in
the tripped Position (red flag is not up)
after the Main Power Switch is switched
on.
N
Set the DMM to the 20K resistance
scale. Switch off the Main Power and
unplug the power cord.
Go to FLAGS 2 through 4 and check
for a high resistance path to ground.
Look for pinched wires or wires with
frayed insulation. Reconnect the
wires to the Main Power Relay. The
G F P
is
in the tripped Position (red
flag
is
not up) after the Main Power
Switch is switched on.
B C D E
I
Go to the Call Flow Diagram in
Section 1.
Note: .Two wiring configurations are
provided in the Circuit Diagrams.
One for copiers equipped with two
drive motors, identified as (Wl 0
Tagl MOD 28), Drum/ Developer and
Fuser Drive Motors. The other for
one drive motor, identified as
(Wl
Tagl MOD 28), Main Drive Motor.
Ensure to refer to the correct
diagram.
Go to FLAG 5 and disconnect the
wires at 4B, 4A, 88, and 8A. Go to
FLAGS 5 through 8 and check for a
high resistance path to ground. Look
for pinched wires or wires with
frayed insulation. Reconnect the
wires at FLAG 5.
The G F P is in the tripped Position
(red flag is not up) after the Main
Power Switch is switched on.
I
Go to the Call Flow Diagram in
Section
1.
Disconnect the following
components separately:
Main Transformer
LVPSIDriver PWB
After each component
i s
disconnected determine if the
GFP
trips when the Main Power Switch is
switched on.
Replace the Main Power Switch (PL 1.2).
Replace the Line Filter (PL 1.2).
121 97
1.6 Ground Fault (Wl Tag1 MOD12) RAP
2-1 49
A 3050