Charging The Drum - Olivetti d-Copia 18MF Service Manual

(2-2) Charging the drum

The following shows a simplified diagram of the electrophotographic components in relation to the engine system.
Charging the drum is done by the main charger unit.
Main charger
wire
Zener
PWB
As the drum rotates in a clean (neutral) state, its photoconductive layer is given a uniform, positive (+) corona charge
dispersed by the main charger wire.
Due to high-voltage scorotron charging, the charging wire can get contaminated by oxidization after a long run.
Therefore, it must be cleaned periodically from time to time. Cleaning the charging wire prevents print quality problems
such as black streaks.
2-1-10
High voltage PWB
YC1-A4
YC-M
YC1-A9
Main charging output
Main charger unit
Figure 2-1-10 Charging the drum
Service Manual
Engine PWB
Bias
PWB
MHVDR1
YC8-10
MHVDR2
YC7-8
Drum
Y104230-6