Drum Charge Roller Cleaning - Gestetner A193 Service Manual

PCU (PHOTOCONDUCTOR UNIT)

4.4.3 Drum Charge Roller Cleaning

[B]
[A]
[C]
[C]
A193D544.wmf
A193D015.wmf
If the drum charge roller gets dirty, drum charge efficiency decreases. This
affects the copy quality, for example causing vertical black lines.
Drum charge roller cleaning is performed for 2 seconds after every copy job.
After the copy job, the charge roller contact clutch is driven another third of a
rotation (see the diagram at the bottom of the previous page). The pressure
lever presses down further, so that the cleaning pad [A] contacts the charge
roller.
After charge roller cleaning, the clutch is driven the final third of the rotation
(until the charge roller H.P sensor [B] is activated) to release the charge roller
from the drum. The pressure lever moves away from the charge roller unit.
Then the charge roller unit is released from the drum by the spring [C].
(A193) 2-28 SM