Canon iR6570 series Service Manual page 204

Chapter 7
Purpose
Operating conditions
Operation length
service mode
Default
- The following is the sequence of operation at time of warm-up:
Drum motor (M1)
Primary charging
Laser
Potential sensor
The sequence and particulars of potential control are as follows:
[1] copier potential control: VD = 8 times max.; VL1 = 8 times max.; VL2 = once
[2] printer potential control: VD = 8 times max.; VL1 = 8 times max.; VL2 = once
SERVICE MODE:
COPIER>OPTION>BODY>PO-CNT (enable/disable potential control)
0: disable potential control
1: enable potential control
- The following settings may be made for potential control executed 10 min and 60 min after the main power switch is turned on and when the door is
opened and closed: COPIER>OPTION>BODY>PO-CNTMD:
[1] off (default): disable potential control
[2] short mode: decrease the length based on potential attained by executing either of the 2 modes
[3] standard mode: execute both copier and printer potential control in succession
- Short Mode (as selected in service mode)
The machine executes one of the 2 potential modes, and makes an assumption for the other mode.
For warm-up after power-on, the machine refers to the primary current level, laser output level, and developing bias DC level for both copier potential
control and printer potential control, thereby computing and saving the resulting rate.
In the course of potential control after power-on, the machine executes one of the 2 potential control modes, thus computing the other in relation to the rate
it obtained at time of power-on and after power-on.
The following is the sequence of operation used for short mode:
Control panel power switch ON
- Standard Mode (as enabled in service mode)
The machine executes both copier potential control and printer potential control in succession.
7-6
10 min and 60 min after the main power switch is turned on
to control sensitivity, thus making up for changes in drum temperature
to accommodate changes in charging efficiency
- start of the 1st job 10 min and 60 min after the main power
switch has been turned on
- the door is opened and closed
off: is not executed (default)
short mode: about 5 sec
standard mode: about 10 sec
settings may be OFF, short, or standard as determined by the following:
COPIER>OPTION>BODY>PO-CNTMD
OFF
Fixing assembly temperature 195 C
WMUP
Copier potential control [1]
VD VD VD VL1
Sets a constant level for both copier
and printer potential control
Copier Printer
Start key ON
potential potential
control control
Fixing assembly temperature
(fixing assembly warm-up complete)
T-7-4
WMUPR
Printer potential control [2]
VL1 VL2 VD VD VD VL1 VL1 VL2
F-7-6
10 min later to less
than 60 min
Assumes a potential l
evel for the other
based on the result
of copier or printer
potential control
Potential control
Start key ON
F-7-7
200 C
STBY
60 min later
Assumes a potential
level for the other
based on the result
of copier or printer
potential control
Potential control