Oce 3121 Technical & Service Manual page 209

2 Roller cleaning
Outline
The copier is equipped to automatically clean the charging roller.
Solenoid (SL1) is switched ON, while the charging roller is rotating, to move
the cleaning pad against the charging roller. The cleaning pad oscillates in the
axial direction of the charging roller.
The cleaning occurs:
After each series of 50 copies: for run lengths exceeding 50 copies.
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At the end of the copying cycle: for run lengths exceeding 500 copies and for
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run lengths below 50 copies.
When 'adjustment/cleaning' is executed in user mode. (In this case, a clean-
I
ing bias is applied to the charging roller and the transfer roller).
Oscillation
Back-and-forth
movement
ed.1
SL1 (energised)
SL1 (ON)
Cleaning pad
Cleaning pad
charging roller
Primary charging roller
OPC
Photosensitive drum
02 Charging 503