Photo Conductor Post-Exposure Control; Photo Conductor Total Exposure Control Upon Recovery; Photo Conductor Small Amount Rotation Control - Konica Minolta magicolor 5550 Service Manual

Theory of operation Ver. 1.0 Nov. 2006
10.3.2

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.
10.3.3

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 proce-
dure from the media misfeed or malfunction.
10.3.4

Photo conductor small amount rotation control

• Ozone stagnant in areas near the charge corona unit reduces sensitivity of the photo
conductors, causing white bands to occur in the image.
• To prevent this image problem, the photo conductor is turned so as to allow its surface
facing the charge corona unit to deviate, thereby preventing the surface sensitivity from
being reduced.
A. Photo conductor small amount rotation timing
• The number of execution sequences is determined when the post process following a
print cycle is completed. The control is executed while the color PC drum motor or inter-
mediate transport motor is in the standby state.
• If the color photo conductors need to be turned a small amount during the monochrome
mode, the control is executed also for the color photo conductors.
10. Print unit section (photo conductor)
Photo conductor
Charge corona unit
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