Pre-Transfer Charging Mechanism; Outline - Canon imageRUNNER 7095 Service Manual

7.5.3 Pre-Transfer Charging Mechanism

7.5.3.1 Outline

The following items are associated with the pre-transfer charging control system:
[1] DC bias constant current control
[2] AC bias constant voltage control
[3] output control suited to environment (fuzzy control)
The following shows the components related to the pre-transfer charging control system:
When '1', high-voltage DC
output is ready.
J510A
1
2
3
HVDC_REMOTE
4
5
6
7
8
9
10
11
HVAC_ON
12
13
14
15
16
17
18
If the current is too high
or too low, '1'.
Voltage input of between 0 and 12 V.
Uses this voltage to control the current value of the pre-transfer bias.
Relay PCB
1 2 3 4
J723
18
17
0 V
16
15
14
13
When '1', the high-voltage
12
AC output is ready.
11
10
9
8
7
POST_DC_CNTR
6
5
POST/SEP_ERR
4
3
2
1
The current value of the pre-transfer bias varies as
follows according to the potential of PTDC-CNT:
300 A
J721
J734
5
4
3
2
1
1 1
J742
HVAC_ON
2 2
24VP
3 3
GND
4 4
GND
5 5
J741
J722
When '1', high-voltage
AC output is ON.
F-7-20
3V
11V 12V
POST_DC_CNT
Pre-transfer charging wire
AC+DC
AC output: 7.0 to 9.0 kVpp
Chapter 7
0010-8054
7-15