6.1.1. 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 if there is toner adhered to the drum surface.
If there is, do the following. If not, go to step 3.
•
Check if the transfer roller is installed correctly or not.
•
Check if the development unit is installed correctly or not.
•
Check if the resistance between the transfer bias terminal on the devel-
opment unit and the transfer roller shaft is less than 10 kOhm or not,
while pushing the roller shaft down to the roller holder.
•
If the resistance is OK, check the connections behind the power pack
and the power pack itself.
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 if all the laser optic components are properly positioned.
•
Try replacing the drum.
4. Check if the toner cartridge is empty or not. If it is, do the following. If not,
go to step 5.
•
Check or replace the toner end sensor.
5. Do the following.
•
Check that the development unit is correctly installed or not.
•
Check if the resistance between the development roller bias terminal on
the development unit and the development roller shaft, the toner meter-
ing plate, and the bias brush are less than 1 kOhm or not.
•
Check if the resistance between the toner application roller bias terminal
on the development unit and the toner application roller shaft is less
than 1 kOhm or not.
•
If all the resistances are OK, check the connections behind the power
pack and the power pack itself.
TROUBLESHOOTING
December 21st, 1995
COPY QUALITY TROUBLESHOOTING
6-2
