Separation Mechanism; Separation Charging Mechanism; Outline - Canon imageRUNNER 7095 Service Manual

7.9 Separation Mechanism

7.9.1 Separation Charging Mechanism

7.9.1.1 Outline

The following items are associated with the machine's separation charging control system:
[1] DC bias constant current control
[2] AC bias constant voltage control
[3] output correction to suit the environment and deposit of toner (fuzzy control)
[4] output correction after detection of leakage
The following shows the components associated with the machine's separation charging control system:
When'1', high-voltage
DC output is ready.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
If the current is too high
or too low, '1'.
Voltage input between 0 and 12 V,
used to control the current level of the separation bias.
Relay PCB
1 2 3 4
J723
J510A
18
17
0 V
16
HVDC_REMOTE
15
14
13
12
When '1',
high-voltage A
11
C output is ready.
10
9
8
HVAC_ON
7
6
SEP_DC_CNTR
5
POST/SEP_ERR
4
SEP_AC_CNTR
3
2
1
When '1', high-voltage
AC output goes on.
The current level of the DC bias varies as
follows according to SEP_DC_CNTR:
520 A
J721
Separation
charging wire
J734
1
2
3
4
5
HVAC_CNT
1
1
J742
HVAC_ON
2
2
24VP
3 3
GND
4 4
GND
5 5
J722
J741
The voltage level of the AC bias varies as f
ollows according to the potential of HVAC-CNT:
12KVPP
8KVPP
F-7-43
3V
11V 12V
SEP_DC_CNT
AC+DC
3V
11V 12V
HVAC-CNT
Chapter 7
0010-8076
7-33