Xerox 3050 Service Manual page 194

11.90 Excessive
Toner Fault
RAP
the status code 11.90 is displayed when the logic
detects that the toner concentration is
significantly greater than the control point value.
the toner control system is designed to maintain
the toner concentratlon within an acceptable
operating range. the control point operating
range Is from 5.3 vdc to 6.5 vdc. the toner sensor
continuously senses the toner concentration. a
change in the toner concentration results in a
corresponding change of the sensor signal. a s the
toner concentratlon increases, the toner sensor
signal voltage decreases. the logic monitors the
sensor slgnal.
1 1 . 9 0 indicates that the logic detected that the
toner concentration increased greatet
than the allowable limit.
the problem may occur if there i s a problem with
the toner dispensing or the developer mixing
systems.
I
NOTE: The circuit diagram and the componenr
locator drawings are on the following
pages.
Initial Actions Procedure
A
Check the Service Log to determine the Enter diagnostic code 109221 then press Yes,
amount of copies run with the Developer in order to enable the copier to run copies
Material. Replace the Developer with the copier in an
LL
fault condition.
Material, if greater than 40K feet, (1 1 K m) Enter the code [0361] in order to exit the
of media has been run. Clean the Pressure diagnostics mode. Make (3) copies of Test
Equalizing Tubes with a vacuum cleaner Pattern
82E5980
in the Normal copy mode.
in.order toner from
the The 11.90 Code
is
displayed as the copler are
tubes. Clean the Augers and Magnetic
run,
Roll. Record the Developer Batch
Number in the Service Log.
B
Checkthe connectors for the Toner Sensor
Complete the service call.
1 "
(Q1) Q1 PI J1, A22 P/
J
1 and the Control Use the last
COW
to check the imaae densitv.
.
.
w
PWB
(A3) A3 P303 for damage. Ensure
that the connectors are seated correctly.
The copy density of the
Square In
the center of the Test Pattern is equal to or
C
Ensure that the Toner Cartridge is not less than the
1.20
Density square on the
damaged and that the seal is secured to Output Reference
82P520.
the Cartridae in the correct location.
-
D Ensure that the Developer Housing Auger
and Drive Gears are not damaged and are
installed correctly, refer to Figure
1,
on
one of the following pages.
E Examine the Developer Housing and
check for a large amount of toner in the
area of the Toner Dispenser.
r: Ensure that the correct amount of
developer material, one charge (7.0 Ibs,
3.3 kg) is installed into the Developer
Housing.
G.
Ensure that the copier is level, (ADJ 14.1).
N
Perform Decrease the Image Density
Adjustment (ADJ 9.4). If the density can
not be decreased, replace the Developer
Material and perform the ADJ 9.2
Electrostatic Series and the ADJ 9.4 to
adjust the image density.
h t e r the code
(0921-41
in order to display
the Control Point and Sensor Reading
Voltages.
There is
+
15 VDC
at connector
Q1
PI
J1
Pin
2.
Y N
I
Go to
FLAG 1
and check for an open or
short circuit to ground in the wires. If
there is no open or short circuit, replace
the Control
PWB
(A3).
LL.90 Excessive Toner Fault RAP