Ricoh LD013, Service Manual

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IMAGE TRANSFER AND PAPER SEPARATION
SM 6-59 B039/B040/B043
6.1.3 TRANSFER ROLLER CLEANING
If the paper size is smaller than the image, or if a paper jam occurs during printing,
toner may be transferred to the roller surface. To prevent the toner from
transferring to the back side of the printouts, the transfer roller requires cleaning
before the next printing run.
During transfer roller cleaning, the high voltage supply unit supplies a negative
cleaning voltage (about –1 kV) to the transfer roller. Any negatively charged toner
on the transfer roller is then transferred back to the drum. Then a positive cleaning
current (+10
µ
A) is applied to the transfer roller to push back to the drum any
positively charged toner on the transfer roller.
The machine goes through the cleaning mode in the following conditions:
•
Before starting the printing job (only if enabled with SP2-996; note that the
default setting is off)
•
Just after the power is switched on.
•
After a copy jam has been cleared
•
After 10 or more sheets of paper have been copied and the copy job has
finished.
Also, the transfer roller cleaning current can be adjusted using SP2-301-4.
6.1.4 PAPER SEPARATION MECHANISM
The discharge plate [A] and the drum curvature of the drum help the paper to
separate away from the drum. The discharge plate is grounded.
B039D401.WMF
B039D307.WMF
[A]