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Main Unit Theory of Operation Toner Cartridge / Photo Conductor
2-23
II Composition/Operation
5.2.2 Photo Conductor post-exposure control
• The entire surface of the Photo Conductor is exposed to light before the Photo Conductor
stops rotating during the stop sequence or color change sequence (from the color print to
monochrome print) after a print cycle.
• Ozone stagnant in areas near the Charge Corona Unit is adsorbed on the surface of the
Photo Conductor. This reduces sensitivity of the Photo Conductor, causing white bands
to occur in the image.
• To prevent this image failure from occurring, the entire surface of the Photo Conductor is
exposed to light and thus neutralized. This effectively prevents the surface of the Photo
Conductor from absorbing ozone.
• <Execution timing>
1. The total exposure sequence is started after the last image moves past the exposure
position (to prevent dirt on the background due to a potential difference between the
Photo Conductor and the Developing Unit).
5.2.3 Photo Conductor total exposure control upon recovery
• If the “Photo Conductor post-exposure control” described above is not correctly done, the
entire surface of the Photo Conductor is exposed to light, thereby preventing ozone from
being adsorbed on the surface of the Photo Conductor.
• If the “Photo Conductor post-exposure control” is not performed due to a media misfeed
or malfunction, the entire surface of the Photo Conductor is exposed to light at the same
time that the “2nd Transfer Roller cleaning control” is performed during the recovery pro-
cedure from the media misfeed or malfunction.
☞ 2-53
• <Execution timing>
1. If a media misfeed or malfunction was present when the Power Switch was turned OFF
last time, the “Photo Conductor total exposure control upon recovery” sequence is per-
formed at the same time with the 2nd Transfer Roller cleaning control when the Power
Switch is next turned ON.
2. The control is executed during the recovery procedure from a media misfeed or mal-
function.
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