Konica Minolta bizhub C250 Service Manual page 96

Theory of operation ver. 3.0 Aug. 2006
14.3.11 Pressure/retraction control during ACS mode
• The pressure/retraction of the 1st image transfer roller is controlled by the number of
multiple copies for the monochrome original during multi-copy cycle, so it promotes the
high productivity and extends the consumables' life.
* ACS: auto color selection
A. Operation
• ACS control starts counting the number of multi-copies of the monochrome original when
switched from the color original to the monochrome original.
• When the number of multi-copies is as specified or under
: The monochrome printing will start with color mode. (with the 1st image transfer roller/
Y/M/C being pressed)
IU (Y/M/C) does not develop or transfer the image, but it rotates when the pressed
transfer belt rotates.
The transfer belt being pressed saves time since the 1st image transfer roller does not
need to be retracted.
• When the number of multi-copies is as specified or over.
: The monochrome printing will start when the color mode is complete and the 1st image
transfer roller /Y/M/C is retracted to be switched to the monochrome mode.
The transfer belt being retracted prevents IU to be wasted by useless rotation.
• Number of multiple copies of monochrome original when paper feed speed is
111 mm/s.
Paper length
216 mm or under
over 216 mm up to 297 mm
over 297 mm up to 381 mm
over 382 mm up to 432 mm
over 433 mm
• Number of multiple copies of monochrome original when paper feed speed is
55.5 mm/s.
Paper length
216 mm or under
over 216 mm up to 297 mm
over 297 mm up to 381 mm
over 382 mm up to 432 mm
over 433 mm
• ACS control operates only after the number of multi-copies for monochrome original is
counted.
"The pressure/retraction control for ACS mode" will not be properly executed with only
one sheet of print job, since on the first copy, the control can be performed only for where
the original is read and counted.
The ACS control performs effectively for the print jobs as listed below.
For the 2nd set of prints onward in electronic sorting
Printing using job programs
Monochrome printing in color mode
4 sheets or less
2 sheets or less
2 sheets or less
1 sheets or less
Switched to monochrome mode
Monochrome printing in color mode
4 sheets or less
2 sheets or less
1 sheets or less
1 sheets or less
Switched to monochrome mode
14. Transfer corona section
Monochrome printing after
switched to monochrome mode
5 sheets or more
3 sheets or more
3 sheets or more
2 sheets or more
1 sheets or more
Monochrome printing after
switched to monochrome mode
5 sheets or more
3 sheets or more
2 sheets or more
2 sheets or more
1 sheets or more
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