Roller Cleaning - Ricoh A193 Service Manual

IMAGE TRANSFER AND PAPER SEPARATION

6.3 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 transfer roller surface. To
prevent this toner from transferring to the back side of copies, the transfer
roller has to be cleaned before the start of the next printing run.
During transfer roller cleaning, the power pack supplies a negative cleaning
bias (- 4 µA) to the transfer roller. So, any negatively charged toner on the
transfer roller is then transferred back to the drum. Then a positive cleaning
bias of +10 µA is applied to the transfer roller to tranfer any toner which was
positively charged by the transfer roller back onto the drum.
The machine will perform the cleaning mode in the following conditions:
•
After a copy job has been finished.
•
At the same time as power on.
•
After a printer jam has been cleared.
Also, transfer roller cleaning process can be performed forcibly by usiing
SP2-910.
(A193) 2-56
A193D531.wmf
SM