Correcting The Output To Suit The Environment And The Toner Deposit - Canon iR7086 Series Service Manual

Chapter 7
When'1', high-voltage
DC output is ready.
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.

7.9.1.2 Correcting the Output to Suit the Environment and the Toner Deposit

iR7105 / iR7095 / iR7086
The separation current output in optimized according to the environment (as identified based on the data from the environment sensor) and the deposit of toner (3
levels: low, standard, high).
In a low humidity environment, the paper tends to be dry,
encouraging charges to collect (high resistance).
The machine decreases the output.
7-30
Relay PCB
1 2 3 4
J723
J510A
18
1
17
2
0 V
3
16
HVDC_REMOTE
15
4
14
5
6 13
12
7
When '1',
high-voltage A
11
8
C output is ready.
9 10
10
9
11 8
HVAC_ON
7
12
13
6
SEP_DC_CNTR
14
5
POST/SEP_ERR
15 4
SEP_AC_CNTR
16 3
17 2
18 1
When '1', high-voltage
AC output goes on.
Low humidity
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
If the deposit of toner is limited, the machine
increases the output to prevent separation faults.
toner deposit low
toner deposit standard
toner deposit high
High humidity
If the deposit of toner is too great, the machine
decreases the current level to prevent re-transfer.
F-7-44
3V
11V 12V
SEP_DC_CNT
AC+DC
3V
11V 12V
HVAC-CNT
0010-8077