Theory of Operation Ver. 8.0 Jun. 2008
10. Photo conductor section
4
5
Composition/Operation
10.3.3
PC drum small amount rotation control
• Humidity around the IU can produce a difference in sensitivity among different PC drums.
This could lead to drum memory, allowing black bands to occur in the image. In addition,
ozone stagnant in areas near the PC drum charge corona reduces sensitivity of the PC
drums, causing white bands to occur in the image.
• To prevent these image problems, that the PC drum is turned at regular intervals to keep
the surface sensitivity uniform as temperature and humidity change.
A. PC drum small amount rotation operation timing
• During the standby state after the end of a print cycle, the PC drum small amount rota-
tion is made under the following timings.
• The machine continues to print for more than a predetermined period of time. (The PC
drum continues to run for more than a predetermined period of time.)
• The machine prints intermittently for a given period of time with an intermission of less
than 10 minutes between print jobs. (The machine detects that the cumulative rotation
time of the PC drum exceeds a given period of time.)
• PC drum cumulative rotation time is calculated based on cumulative drive distance of the
PC drum.
• The time interval between small amount rotations is set different depending on how long
the PC drum has been used and what the humidity and the temperature are inside the
machine.
A00JT2C014DA
A00JT2C013DA
PC drum/K
PC drum/Y,M,C
Y107522-3 Theory of Operation
