Ricoh K-C3.5L Service Training page 81

Negative cleaning current is applied, followed by
positive current.
Three conditions for entering cleaning mode:
Slide 81
More on Transfer Roller Cleaning
Toner may transfer from drum to transfer roller if:
A paper jam occurred
The paper size is smaller than the printed image
The transfer roller must be cleaned to prevent toner from being transferred from
the roller to the back side of copies.
There is no mechanism, just the application of positive and negative current
to transfer any adhering toner back to the drum.
The negative current pushes negatively-charged particles back to the
drum.
The positive current pushes positively-charged particles back to the
drum.
Note that the roller is not cleaned before each job unless the setting of SP2-
996 is changed from the default. This is to keep the copy speed as high as
possible.
The toner that transfers back to the drum is recycled with the other unused toner.
Paper dust may also find its way into the toner because of this.
Transfer Roller Cleaning
Negatively and positively charged toner particles
are both transferred back to drum.
Current for negative-charge phase can be
adjusted with SP 2301-4.
Before starting a job
» Default: Cleaning is not done before each job.
– Change with SP 2996 if required
Just after turning on power.
After a copy paper jam has been removed.
81
Model K-C3.5L