Canon imageRUNNER ADVANCE 6075 Series Service Manual page 109

2
Technology > Image Formation System > Controls > Primary Charging
● Primary Charging Shutter Control
To prevent uneven potential on the Photosensitive Drum caused by discharge products
(nitrogen oxide) accumulated on the Primary Charging Assembly.
NOTE:
In the environment which moisture content is lower than the one in power saving
environment (temperature: 22 deg C, humidity: 75%, moisture content: 12.41g),
set the Drum Heater to OFF in the sleep mode after a specified time passes.
Discharge product (nitrogen compound) which is generated at the Charging
Assembly when image is formed is deposited on the Drum when the time passes.
When the Drum Heater is OFF, the discharge product (nitrogen compound) has a
chemical reaction with the moisture in the air and generates nitric acid. This nitric
acid deteriorates the surface of the Drum and causes the image failure.
<Execution timing>
• When the Drum Heater is turned OFF
• During sleep mode
<Execution timing>
• After 4 or 5 hours since the drum was stopped*
*The time is determined by the environment (moisture content) when the drum operation
was stopped
Environment Moisture content Temperature/Humidity Drum Heater
1 to 0.86
2 to 1.73
3 to 5.8
4 to 8.9
Energy save to 12.41
5 to 15
6 to 18
7 to 12.41
2 Technology > Image Formation System > Controls > Primary Charging
Time
23 deg C 5% OFF 300 min.
23 deg C 10% OFF 285 min.
23 deg C 30% OFF 270 min.
23 deg C 50% OFF 255 min.
22 deg C 75% OFF 240 min.
23 deg C 70% ON Not close
27 deg C 80% ON Not close
30 deg C 80% ON Not close
Shutter Open/Close Operation Sequence
Elapsing time
Image formation is
completed.
or
Standby mode starts.
Sleep mode starts.
(Min. 10 sec.,
Max. 240 min.)
DC Controller starts.
(DCON alarm)
(240 min. to 300 min.)
Sleep mode restarts.
Recovery starts.
1. Operation of Charging
Shutter opening
2. Fixing warm-up
T-2-33
Startup sequence
Image formation starts.
Operation
1. Calculate the moisture content. (Environment Heater) Refer to the table.
2. Based on the moisture content, determine the time until the Charging
Shutter is closed.
3. Set the DC Controller startup time (DCON alarm).
1. Calculate the moisture content. (Environment Heater) Refer to the table.
2. Determine whether the Drum Heater is ON or OFF during sleep mode.
1. DC Controller checks whether the Drum Heater is ON or OFF.
Drum Heater is ON or OFF.
ON
Charging Shutter is not closed. Charging Shutter is closed.
1. Charging Shutter is opened or closed.
2. Drum Heater is ON or OFF.
3. Two dimensional shading is ON or OFF.
Charging Shutter is
opened.
Drum Heater is ON.
Charging Shutter is closed.
Two dimensional
Drum Heater is OFF.
shading is OFF.
1. Drum Heater is changed 1. Drum Heater is OFF .
from ON to OFF. 2. Fixing warm-up
2. Fixing warm-up
Drum Heater is ON.
2-55
OFF
Charging Shutter is
opened.
Drum Heater is ON.
Two dimensional
shading is ON.
F-2-75
2-55