Pc Drum Small Amount Rotation Control - Develop QC 2235 Plus Service Manual

QC 2235plus Theory of Operation Ver.1.0 Mar. 2004
6.3.3

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, it should be ensured that the same face of the PC
Drum is left exposed to the same condition for an extended period of time. The PC Drum
is therefore turned at regular intervals to keep the surface sensitivity uniform.
A. PC Drum small amount rotation timing
• The PC Drum is turned the small amount when a predetermined threshold value of the
cumulative PC Drum driven distance is exceeded during a multi-print cycle or when inter-
mittent print cycles are consecutively run with an intermission of less than a predeter-
mined period of time between them.
PC Drum
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2-17
Photo Conductor section