Controlling The Transfer Bias; Transfer Roller Bias Control; Separation Mechanism; Static Eliminator Bias Control - Canon iR2020 Series Service Manual

Canon ir2020/2016 series service manual
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6.8.2 Controlling the Transfer Bias

6.8.2.1 Transfer Roller Bias Control

iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
A negative bias, sheet-to-sheet bias, or positive bias is applied to the transfer charging roller according to the type of sequence.
The negative bias is applied at the prescribed timing to moves the toner from the transfer charging roller to the photosensitive drum for cleaning.
The sheet-to-sheet bias is lower than that applied during printing and it is applied at the prescribed timing to prevent the toner remaining on the photosensitive drum
from adhering to the transfer charging roller.
The positive bias is applied to transfer toner images from the photosensitive drum to paper.

6.8.3 Separation Mechanism

6.8.3.1 Static Eliminator Bias Control

iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
Two types of biases, a high-output bias and a low-output bias, are applied to the static eliminator using the static eliminator bias drive signal (/DISDCFOT) and
static eliminator bias output level signal (/DSCPWM) issued from the DC controller PCB according to the type of the print sequence, thus allowing the printing
paper to separate easily from the photosensitive drum.
High-voltage power supply PCB
DC
controller
PCB
/TRPWM
Comparison
ASIC
/TRPFOT
TRCHG
Constant current/voltage
switching circuit
/TRNFOT
CPU
TRCRNT
DC controller
PCB
ASIC
/DSCPWM
/DISDCFOT
CPU
[2]
[1]
F-6-12
Transfer bias circuit
Positive current
circuit
detection circuit
Positive voltage
generation circuit
Superimposition
Negative voltage
generation circuit
F-6-13
High-voltage power supply PCB
Static eliminator bias circuit
Static eliminator bias
generation circuit
F-6-14
Tr3
To transfer
charging roller
JP9/JP10
To static eliminator
Chapter 6
0011-1657
0011-1658
6-7

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