Xerox 3050 Service Manual page 198

LL.91 Low Toner Fault RAP
The status code 11.91 is displayed when the
toner concentration
i s
lower t h a n t h e
nominal setpoint.
This status code may occur i f there i s a
problem with the toner dispensing or the
mixing of the developer material. The lnitial
Actions deal with the most likely mechanical
causes for the LL.91 code.
lnitial Actions
Proceed to REP. 9.5 and ensure that
the developer material Is being mixed
properly.
Ensure that the developer level i s
correct, minimum of 7.0 Ibs..
Ensure that the toner cartridge i s not
defective and that enough toner i s
dispensed into the developer housing.
Ensure that the Developer Housing
Auger and Drive Gears are""not
damaged and are installed correctly,
refer t o the LL.90 Excessive Toner Fault
RAP, Figure
1.
Note: Enter diagnostic code 109221 to enable
L
the copier t o run a Copy w i t h the
copier in an LL fault condition. Enter
the code [036
11
to exit diagnostics.
ocedure
ter the code [0921-41. The sensor voltage
jreater than or equal to
(
+
) 8
VDC.
N
Enter the code [0926] in order t o reset
the toner control NVM values t o default.
The LL.91
Code
is
displayed after
a
copy
run.
I
Go t o the ADJ
9.2
Electrostatic Series,
lnitial Density Adjustment t o check1
adjust the image density.
Go t o
FLAG
land check the wiring for an
open or short circuit.
The LL.91 Code is displayed after a copy
run.
(
Proceed t o wrap up the cell.
Replace the Toner Sensor (Q1). If the
problem is not corrected, Replace the
NVM
.
If the problem persists, replace
the Control PWB (A3). Go to the AD1 9.2
Electrostatic Series, lnitial Density
Adjustment t o check/ adjust the image
density.
9
to FLAG 1 and check the wiring for an
,en or short circuit.
b e 11.91 Code is displayed after a copy run.
Go to the ADJ
9.2
Electrostatic Series,
lnitial Density Adjustment to check1
adjust the image density.
A
Enter the code
109261
in order to reset the
toner control
NVM
values to default.
The
LL.91
code is
still
present.
Y N
I
Go to the AD1 9.2 Electrostatic Series,
lnitial Density Adjustment to check/
adjust the image density.
Replace the Developer material (REP 9.7). If
problem persists, replace the Toner Sensor (Q1).
Go to the
AD1 9.2
Electrostatic Series, lnitial
Density Adjustment t o check/ adjust the image
density.
The 11.91 code i s still present.
Y N
I
Proceed t o wrap up the call.
Replace the NVM. If the problem persists,
replace the Control PWB (A3). Go to the ADJ
9.2
Electrostatic Series, lnitial Density
Adjustment to check/ adjust the image density.
CONTROL PWB (A3)
A3
8/94
LL.91 Low Toner Fault RAP
2-108 3050