Detecting The Toner Level And Controlling The Toner Supply Mechanism - Canon ImageRunner iR8500 Series Service Manual

Chapter 8
When '1', developing
AC bias is generated.
A voltage input between 0
and 12 V, used to control the
voltage level of the
developing DC bias.
Related Service Mode
COPIER>ADJUST>DEVELOP>
DE-DC
(image area developing DC bias output
input)
COPIER>ADJUST>DEVELOP>
DE-NO-DC
(sheet-to-sheet-distance developing DC
bias output input)
COPIER>ADJUST>DEVELOP>
DE-OFST
(developing DC bias offset level offset
adjustment)

8.6.5 Detecting the Toner Level and Controlling the Toner Supply Mechanism

iR105i/iR105+ / iR9070 / iR85+ / iR8070
Figure shows the construction of the toner supply control system.
8-28
Relay PCB
1 2 3 4
J721
J510A J723
0 V
1
16
HVDC_REMOTE
2 15
14
3
13
4
5 12
6 11
10
7
DEV_AC_ON
9
8
DEV_DC_CNTR
9
8
10 7
11 6
12 5
13 4
14
3
15
2
16 1
When '1', developing AC
bias is generated.
If you have replaced the MFC PCB or initialized the
RAM on the MFC PCB, enter the value recorded on
the service label.
Settings: 0 to 500
Settings: -50 to 50
AC output 1200 Vpp
J732
The developing DC bias varies as
follows according to the
DEV_DC_CNTR potential.
500V
image area
Non-image
area
F-8-37
T-8-18
Higher setting
Lighter images
Lower setting
Developing cylinder
3V
11V 12V
DEV_DC_CNTR
Darker images
0006-9842