Ll90 Overtoned Fault Rap - Xerox 8830 Service Manual

LL.90 Overtoiled Fault RAP
NOTE: Refer to BSD 9.7 while using this
RAP.
The status code LL.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 Concentration within an
acceptable operating range. The Control Point
operating range is from 5.2 VDC to 6.0 VDC.
The Toner Sensor continuously senses the
Toner Concentration. A change in the Toner
Concentration results in a corresponding
change of the Sensor signal. As the toner
concentration increases, the Toner Sensor
signal voltage decreases. The logic monitors
the Sensor signal.
LL.90 indicates that the logic detected that the
toner concentration increased greater than the
allowable limit.
The problem may occur if there is a problem
with the toner dispensing or the developer
mixing systems.
Initial Actions
• Clean the Pressure Equalizing Tubes with
a vacuum cleaner in order to remove toner
from inside the tubes. Clean the Augers
and Magnetic Roll
• Examine the Developer Housing and
check for a large amount of toner in the
area of the Toner Dispenser.
• Ensure that the printer is level.
• Ensure that the Toner Cartridge is not
damaged and that the seal is secured to
the Cartridge in the correct location.
• Ensure that the Developer Housing Auger
and Drive Gears are not damaged and are
Installed correctly (Figure 1).
• Check that all the connectors between the
Toner Sensor, A22Q1, and the Main
PWB, A2, are seated correctly.
Procedure
With the printer in an LL.90 fault condition,
enter diagnostic code [9-22] and then press
YES, in order to enable the printer to function
with an LL.90 fault condition. Enter the code
[0361] in order to exit the diagnostics mode.
Run 3 test prints [9-55 Patern 5].
ENSURE THAT THE REAR AUGER DRIVE GEAR IS POSITIONED WITH THE FLANGE
AS SHOWN.
ENSURE THAT THE DEVELOPER HOUSING DRIVE GEAR IS POSITIONED WITH THE
FLANGE AS SHOWN.
ENSURE THAT THE FRONT AUGER DRIVE GEAR IS CAPTURED IN POSITION BY
THE REAR AUGER DRIVE GEAR FLANGE AND THE DEVELOPER HOUSING DRIVE
GEAR FLANGE.
DEVELOPER
HOUSING
DRIVE GEAR
Figure 1. Developer Housing and Auger Drive Gears
1/98
2-9
The LL.90 code is displayed as the print is
being made.
Y N
I Complete the service call.
Use the last print to check the image density.
The image density of the 1.0 Solid Square
In the center of the Test Pattern [0955-5] is
equal to or less than the 1.20 Density
Square on the Output Reference SIR 495.1.
Y N
I Perform the Tone-Down
I [09-06]. If the printer does not tone-down,
A perform the Image Density Adjustment
A
(ADJ 9.3).
FLANGE
FLANGE
REAR AUGER
FRONT AUGER DRIVE GEAR
DRIVE GEAR
procedure
CARTRIDGE
DRIVE MOTOR
REMOVED FOR
CLARITY
W2707
LL.90 RAP