Canon ImageRunner iR8500 Series, Руководство по обслуживанию, Страница: 376 / 1122

Chapter 8
8-36
8.8 Separation Mechanism
8.8.1 Separation Charging Mechanism
8.8.1.1 Outline
0006-9791
iR105i/iR105+ / iR9070 / iR85+ / iR8070
The separation mechanism is controlled for the following:
[1] DC bias constant current
[2] AC bias constant current
[3] output correction to suit the environment and deposit of toner (fuzzy control)
[4] output correction upon detection of leakage
Figure shows the construction of the control system for the separation charging mechanism.
F-8-49
8.8.1.2 Correcting the Output to Suit the Environment and the Toner Deposit
0006-9795
iR105i/iR105+ / iR9070 / iR85+ / iR8070
The separation current output is controlled to an optimum level to suit the environment (conditions identified by the data from the environment sensor)
and the toner deposit (low, average, or high based on the count of black pixels).
DC controller PCB
J510A
J723
J722
AC+DC
J741
J742
J721
J734
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0 V
24 VH 24 VH
HVDC-EN
HVAC-EN
24VP
GND
GND
HVAC-CNT
HVAC-ON
SPDC-CNT
PT/SP-ERR
HVAC-CNT
High-voltage DC PCB
GND GND
1 2 3 4
Relay PCB
4
2
1 1
2
3
4
3
5 5
1
2
3
4
5
12KVPP
8KVPP
3V
11V 12V
HVAC-CNT
The AC bias voltage level varies
according to the HVAC-CNT potential.
Separation
charging wire
High-voltage AC transformer
High-voltage AC PCB
When '1', the high-voltage
DC output is ready.
500µA
3V
11V 12V
SPDC-CNT
The level of the DC bias varied to suit the
SPDC-CNT potential.
When an overcurrent
or an under current is
detected, '1'.
A voltage input between 0 and 12 V, used to control
the current level of the separation bias.
When '1', high-
voltage output
turns on.
When '1',
high-voltage
AC output is
ready