Functional Description; Controlling The Bias For The Fusing Roller - Oce 3121 Technical & Service Manual

Functional description

1 Controlling the bias for the fusing roller

Bias for the transfer guide
The negative bias (-600 V DC) for the transfer guide is used to prevent adhe-
sion of toner to the transfer guide. The same potential is applied to the toner.
Application of the bias continues when the control panel power remains ON.
Bias to the fuser roller
A positive bias is applied to the steel core of the fuser roller. This is to prevent
offset to the fuser film.
For this reason the lower roller is connected by an electrode at the rear of the
machine. For details see Dis-/assembly "Removing the lower roller from the
fuser unit".
Composite power supply PCB
DC controller PCB
ed.1
T101
T101
drive
circuit
Q605
CPU
J209-A4~A9
J102-A4~A7
IC101
CPU
Fixing Photosensitive
drum
assembly
Transfer
guide
17 Fusing 501