PRINTER
14 June, 2002
6-20
Transfer Roller Cleaning
If the paper size is smaller than the printed image, or if a paper jam occurs during
printing, toner may be transferred to the roller surface. To prevent this toner from
transferring to the back side of the printouts, the transfer roller has to be cleaned
before the next printing run.
During transfer roller cleaning, the high voltage supply unit supplies a negative
cleaning bias to the transfer roller. The negatively charged toner on the transfer
roller is then transferred back to the drum. Then a positive cleaning bias is applied
to the transfer roller to push back to the drum any toner which was positively
charged by the transfer roller.
The machine goes through the cleaning mode in the following conditions:
•
After a printer jam has been cleared.
•
Just after the power is switched on.
•
After every 5 sheets printed (if the 5-page interval expired during a job, the
machine waits until the end of the job).
Service Call Conditions for the Transfer Section
Sub-Code Error
Code
Description
0401 9-29
0402 9-29
For 200 ms the machine detects a PWM output duty ratio
of
≤
10% despite a feedback voltage of 1V or 4V. For
details, see “4.3 Service Call Conditions”.
