Xerox 3050 Service Manual page 268

11.26 Loss of lllumination RAP
(041 041 94)
The Status Code LL.26 is displayed when the
logic detects that there is an lllumination
problem. The problem may be caused by
the Exposure Lamp, lllumination Sensor, the
wiring, or a PWB failure.
Initial Actions
Ensure that connectors A5
P22
and
P21 of the Lamp Ballast are seated
correctly.
Ensure that the exposure lamp
sockets are not damaged and the
Lamp is seated correctly.
Ensure that the Lamp jacket is
positioned correctly.
Ensure that the lllumination Sensor is
seated correctly.
Ensure that the LVPS and Controller
PWB connectors are seated correctly.
WARNING!
The Exposure lamp, HVPS,
Erase Lamp, Main Drive Motor, Fuser, and
the Drum Cleaning Blade are energized
when diagnostic code (0921-05) is entered.
Procedure
Enter the diagnostic code 10921-051.
The Exposure Lamp lights.
There i s
( + 26
VDC Bulk) between
A2
P208 Pin 1 and Pin 3 (DC Com) of the
LVPS PWB (A2).
Y N
Replace the LVPS PWB (A2).
B
Press STOP, in order t o cancel the code.
There is approximately ( + 26 VDC) at
A2 P208 Pin 4 of the LVPS PWB (A2).
1
replace the Lamp Ballast (AS).
Enter the code (0921
1
while observing
the DMM.
The voltage at A2 P208 Pin 4 changes
from approximately ( + 26 VDC) t o less
than (1.0 VDC).
Replace the LVPS PWB (A2). If the
problem persists, replace the
Control PWB (A3).
6rers STOP, i n order t o cancel the code.
There is approximately
(
+
26 VDC) at
A2 P208 Pin 6
of
the LVPS PWB (A2).
Y N
I
Replace the Lamp Ballast (AS).
Enter the code (0921-051.
When the copier enters the READY
condition, the voltage at A2 P208 Pin 6
changes from approximately (+26
VDC) t o less than (1.0 VDC)
.
C D E
I
Replace the LVPSI Driver PWB (A2). If
the problem persists, replace the
Control PWB
(A3).
Press STOP, in order t o cancel the code.
Enter the code [0921-51.
The voltage at A2 P208 pin 7 is greater
than 14.0 VDC.
Go t o FLAG
4
and check for a short
circuit t o ground in the wiring. If
there is no short circuit, replace the
I
LVPSI Driver PWB
(A2).
If the
problem persists, replace the Control
PWB (A3).
Replace the Exposure Lamp.
The Exposure Lamp Illuminates.
N
Go
t o FLAG
2
and check the wiring
for an open or short circuit t o ground
in the wires. Repair the wires as
required. If the problem s t i l l exists,
replace the Lamp Ballast PWB (AS)..
perform the Final Actions i n order t o
complete the Service Call.
Go t o FLAG 3 and check the wiring for an
open circuit. If there are no open circuit,
replace the lllumination Sensor
(91).
If the
problem persists, replace the Control
PWB
043).
8194
11.26 Loss of Illumination RAP
2-72 3050