Oce 3121, Technical & Service Manual

Page: 258 / 908

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ed.1 06 Transfer 505
4 Controlling the bias for the Static Eliminator during separation
Switching ON and OFF the bias for the static eliminator
The CPU (Q605) on the power supply PBA, receives the separation static elim-
inator ON signal (SEBON). This causes the separation static eliminator bias
drive circuit to apply a bias to the static eliminator.
Controlling the voltage
The output for the eliminator bias is returned to the bias drive circuit. This is
used to control the voltage to a specific value.
Switching the bias voltage for the static eliminator
The separation bias differs physically for copying on the first and second side
of a two-sided copy or for an overlay copy.
To suit differences, the separation static eliminator drive signal 1/2 is used to
switch the bias voltage. This ensures efficient separation.
Composite power supply PCB
Transformer
(increase)
circuit
Separation static
eliminator bias
drive circuit
T101
drive circuit
DC controller PCB
Photosensitive
drum
Separation
static eliminator
T101 dr
iv
e signal
Ser
ial
comm
u
nication
Separ
a
tion
static
elimina
tor
ON/OF
Fs
ig
n
a
l
Separ
ation
static
elimina
tor
dr
iv
e
siganl 1
Separ
ation
static
elimina
tor
dr
iv
e
siganl 2
T101
Q605
CPU
IC101
CPU
J209-A4~A9
J102-A1~A7
J209-B7
J102-B4