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COPY QUALITY TROUBLESHOOTING
7.1.1 BLANK COPIES
Possible Cause (Printer)
• Poor drum sensitivity.
• Laser optic components are out of position.
• The proper bias voltages are not applied to the toner application roller and/or the
development roller.
• The proper current is not applied to the transfer roller.
Action:
1. Print a test pattern, and open the cover in the middle of printing.
2. Check to see if there is toner adhered to the drum surface.
If there is, do the following. If not, go to step 3.
• Check to see if the cartridge is correctly installed.
• Check to see if the transfer roller is correctly positioned.
3. Check if there is toner on the surface of the development roller.
If there is, do the following. If not, go to step 4.
• Check to see if the laser optic components are properly positioned.
4. Check to see if the cartridge is empty. If it is, replace the cartridge.
If not, do the following.
• Check the connection between the FCU (CN13) and the toner end sensor
• Replace the toner end sensor.
7.1.2 BLACK COPIES
Possible Cause (Scanner)
• The contact image sensor is defective.
Action:
1. Check the connection between the FCU (CN8) and the contact image sensor.
2.
Replace the contact image sensor.
Possible Cause (Printer)
• The charge is improperly applied.
Action:
1. Check the connections between the power pack, the charge voltage terminals,
and the cartridge.
• If they are OK, go to step 2.
• If not, fix the connections.
2. Check the connections behind the power pack.
7-2
30 November, 1999
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