Supply Rap - Xerox 3050 Service Manual

CQ 26 High Voltage Power
A
Supply RAP Enter the diagnostic code [0921-I] and connect
the (-) to Pin 2 of A25 P25 and check for a low at
A25 P25 Pin 6 and A2 P204 Pin 7. If there is not a
This RAP i s used for C O P Y quality problems
low at both pins, go to FLAG 2 and check the
related
to
the loss
Charge
Or
Transfer
wiring
.
If the wlring is O K replace the LVPS. If
used to check
the problem still exists. replace the Controller
problems.
PWB.
Initial Actions
Enter the diagnostic code (0921-21 and connect
Switch off and unplug the copier.
I
the
(-1
to Pin
2
of A25 P25 and check for a low at
Ensure that the connectors are A25 P25 Pin 3 and A2 P204 Pin 10. If there is not
correctly seated on the high voltage
a low at both pins, go to FLAG 3 and check the
power supply.
wiring
.
If the wiring is OK, replace the LVPS. If
the problem still exists, replace the Controller
Ensure that all corotrons are
PWB.
connected and free of
contamination.
NOTE:
The
wire between
A25
P25 Pin
3
and
A2
Procedure
P204 Pin 10 is used for charge bias.
During rescan of a normal copy run the
Set the meter to measure
+
26 VDC.
charge bias will momentarily go from
0
I
Connect the
(-)
lead to the GND test point
and the
(
+
)
lead to (TP4) on the HVPS.
Plug in and switch on the copier.
There Is
t
26 VDC at pins 1
and 10 of A25
P25 of the HVPS.
N
If there is
+
26
VDC
at Pins
4
and 12 of A2
P204 go to FLAG 1 and check the wiring
for an open circuit.
If
there
is
not
t
26
VDC at pins 4 and 12 of A2 P204 replace
the LVPS.
VDC to about 14.5 VDC. This bias
change effectively shuts down the
Charge Current during rescan, enabling
the copier
to
run cleaner with decreased
toner consumption.
Enter the diagnostic code 10921-11 and connect
the
(-)
to Pin 2 of A25 P25 and check for
a
low at
A25 P25 Pin 4 and A2 P204 Pin 9. If there i s not a
low at both pins, go to FLAG 4 and check the
wiring
.
If the wiring is O K replace the LVPS. If
the problem still exists, replace the Controller
PWB.
Enter the diagnostic code 10921-11 and
connect the (-)to
Pin
2 of A25 P25 and check
for a low at A25 P25 Pin 11 and A2 P204 Pin
3. If there is not a low at both pins, go to
FLAG 5 and check the wiring. If the wiring is
O K replace the
LVPS.
If the problem still
exists, replace the Controller
PWB.
Go to ADJ. 9.2, i f any of the outputs cannot
be
set,
check for an open circuit in the wiring
from the HVPS to the corotrons.
If the problem still exists, repair or replace
the problem corotrons.
If the problem still exists, replace the HVPS
and perform the Electrostatic Series (ADJ
9.2).
8/94
CQ 26 t ljgh
*
' .
l-ge Power Supply RAP
3-78
3050