Pre-Transfer Charging Mechanism - Canon iR5055 Series Service Manual

The following signal is associated with the mechanism:
[1] dust-collecting roller bias remote signal; if '1', the dust-collecting roller bias turns on.

7.5.4 Pre-Transfer Charging Mechanism

7.5.4.1 Overview
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The following items are associated with the pre-transfer charging control system:
1. controlling the constant current level of the DC bias
2. controlling the fixed voltage level of the AC bias
3. controlling the output to suit the environment (fuzzy control)
The following shows the construction of the system associated with the pre-transfer charging control mechanisms:
The following signals are associated with the mechanism:
[1] Pre-transfer/separation charging leakage detection signal; when the current is too high or too low, '0'.
[2] Pre-transfer charging control signal; controls the DC bias current and AC bias voltage generated by the high-voltage PCB.
[3] Pre-transfer/separation charging remote signal; turns on/off the pre-transfer/separation current output.
7.5.4.2 Controlling the Output to Suit the Environment (fuzzy control)
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The pre-transfer charging current is optimized to suit the environment (i.e., reading of the environment sensor):
SERVICE MODE:
HVT_ROLLER_BIAS
[1]
F-7-16
SEPARATE-LEAK-
DETECT [1]
HVT_AC [2]
HVT_POST [3]
F-7-17
Low temperature
F-7-18
DC -1000V
Dust-collecting
roller
Scraper
Pre-transfer charging wire
AC+DC
High temperature
Chapter 7
0015-4492
0015-4494
7-11