6.1.1. Blank Copies
Possible Cause (Scanner):
•
Malfunction in the scanner drive mechanism.
•
Obstructions in the scanner drive path.
Action:
1. Do the ADF test (service function 10) and check that the scanner moves
correctly. Also, check for any obstrctions in the scanner drive path.
2. If the problem occurs only during ADF copying, check that the scanner
moves to the correct ADF scanning position.
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.
TROUBLESHOOTING
May 22nd, 1995
COPY QUALITY TROUBLESHOOTING
6-2
