Xerox 8825 Service Manual

01/02
2-11
8825/8830 Printer
LL-90 Overtoned Fault RAP, LL-91 Undertoned
Status Indicator RAPs
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 Pattern 5]. The LL-90 code is dis-
played as the print is being made.
YN
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.
YN
Perform the Tone-Down Procedure [09-06. If the printer does not tone-down, perform the
Image Density Adjustment. Go to ADJ 9.3.
Enter the code [9-21-4] in order to switch on the Main Drive Motor and the Toner Sensor circuit.
Connect the (+) meter lead to the Toner Sensor A22Q1P1-2 and the (-) meter lead to
A22Q1P1-4. There is +15 VDC present.
YN
heck for an open or short circuit to ground in the wires connected to A22Q1P1-2 and
A22Q1P1-4. If the wires are ok, replace the Main PWB, A3, PL 1.1A.
Connect the (+) meter lead to the Main PWB A3J303-4 and the (-) meter lead to ground.
There is +5.2 to +6.0 VDC is present.
YN
Connect the (+) meter lead to the Toner Sensor A22Q1-1 and the (-) meter lead to
ground. There is greater than +0.2 VDC present.
YN
Disconnect Toner Sensor A22Q1P1 from A22Q1J1. Connect the (+) meter lead to
the Main PWB A3J303-16 and the (-) meter lead to ground. There is greater than
+0.2 VDC present.
YN
Replace the LVPS, A5, PL 1.1APL 1.1A. If the problem persists, replace the
Main PWB, A3,
Check for an open or short circuit to ground in the wires connected to A22Q1-2 and
A22Q1-4. If the wires are OK, replace the Toner Sensor A22Q1, PL 9.9. Run [9-21-6
Toner Sensor Calibration.
Check for an open or short circuit to ground in the wire connected to A22Q1P1-3. If the
wire is OK, replace the Toner Sensor A22Q1, PL 9.9. Run [9-21-6 Toner Sensor Calibra-
tion.
Replace the Main PWB, A3, PL 1.1A.
LL-91 Undertoned Fault RAP
NOTE: Go to BSD 9.7 while using this RAP.
The status code LL-91 is displayed when the logic detects that the toner concentration is signif-
icantly less than the Control Point value.
The Toner Control System is designed to maintain the Toner Concentration within an accept-
able operating range. The Control Point operating range is from 5.2 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 decreases,
the Toner Sensor signal voltage increases. The logic monitors the Toner Sensor signal.
LL-91 indicates that the logic detected that the toner concentration decreased 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
• Examine the Toner Cartridge to ensure that the Cartridge is not empty and is installed cor-
rectly.
• Check the Cartridge for damage and ensure that the seal is secured to the Cartridge in
the correct location.
• (Figure 1 ) Ensure that the Developer Drive Coupling is in good condition and is engaged
fully.
• (Figure 2) Ensure that the Developer Housing Auger and Drive Gears are not damaged
and are installed correctly.
• 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-91 fault condition, enter diagnostic code [9-22] and press Yes, in order
to enable the printer to function with an LL-91 fault condition. Enter the code [0361] in order to
exit the diagnostics mode.

Xerox 8825 Specifications

General

Brand	Xerox
Model	8825
Category	Printer
Language	English