Auxiliary Process; High Voltage System - Oce 3121 Technical & Service Manual

4 Auxiliary Process

Static elimination during output
As it leaves the fuser, the copy carries residual charges from the transfer stage.
To dissipate these charges, a static eliminator is provided at the output side
charges (earthed brush).

5 High voltage system

HT transformer circuit
The HT circuit for the formation of the image is a part of the power supply
PBA. It is used for the following:
Limiting the charging voltage
I
Limiting the transfer voltage
I
Limiting the current for the static eliminator, for the separation
I
Limiting the DC developing bias
I
Switching the AC developing bias ON and OFF
I
Applying a potential to the transfer guide
I
Switching the fusing bias ON and OFF
I
The power supply PBA also incorporates the circuits for the lamp regulation
and for the control of the power supply for the lamp.
lower fix-
ing roller
10 TSM Océ 3121
primary charging
roller
drum
static
transfer roller
elimi-
nator
composite power supply
developing unit
transfer guide
HVT circuit
General operation