Konica Minolta bizhub C658 Service Manual page 1828

bizhub C658/C558/C458/C368/C308/C258
[1] Transfer belt
[3] 1st transfer roller/C
[5] Photo conductor/K
[7] Photo conductor/M
[9] 1st transfer roller/Y
Black mode
[1] Transfer belt (retraction position)
(3) ACS mode
(a) ACS mode overview
• When making a copy, any desired copy mode can be selected from the control panel. (The default setting is the "auto color mode".)
The auto color mode is called the ACS (auto color selection) mode. (In PC print job, auto color as the setting item in the printer driver
corresponds to the ACS.)
• In ACS mode, the machine analyzes the image data of the original scanned by the "scanner section" to determine whether the image
data is colored or in black.
• Determining that it is a color original, the machine presses the 1st transfer roller and runs a color print job.
• Determining that it is a black original, the machine retracts the 1st transfer roller and runs a black print job.
(b) Control of 1st transfer roller in ACS mode
• The number of sheets of continuous series of black originals is counted when color originals are changed to black originals.
• Pressure of the 1st transfer roller is controlled according to the number of sheets of continuous series of black originals during a multi-
print cycle, thereby achieving both high print productivity and extended service life of consumables.
• "Control of 1st transfer roller in ACS mode" is executed only when a copy is made with "Auto Color" selected from the control panel. It
is not executed when "Full Color", "Black", "2 Color", or "Single Color" is selected.
• The control is executed, for "PC print", only if the print cycle is run with "Auto Color" selected from the printer driver screen. It is not
executed when "Full Color" or "Grayscale" is selected.
• The 1st transfer roller/Y,M,C is in the pressed position (color mode) in its initial state.
NOTE
▪ The control of 1st transfer roller in the ACS mode is enabled only after the number of sheets of continuous series of black
originals has been counted. It is therefore not an effective control for a copy print job involving only one copy set/stack. The
control is effectively operable for the following print jobs: Since on the first copy, the control can be performed only for
where the original is read and counted.
"Copy print of the second copy set/stack and onward"
"Copy print from a registered job"
"PC print job"
(c) When the number of multi-copies is as specified or under
• ACS control starts counting the number of multi-copies of the black original when switched from the color original to the black original.
• The black printing will start with color mode. (with the 1st transfer roller/Y,M,C being pressed) Developing or transfer does not take
place with the developing unit (Y, M, C), but, since the transfer belt is pressed, the PC drum and the developing roller are rotated as
the transfer belt rotates. An advantage during pressure the 1st transfer roller/Y,M,C is that the loss time related to print productivity that
generates due to retraction of the 1st transfer roller can be reduced.
(d) When the number of multi-copies is as specified or over
• The black printing will start when the color mode is complete and the 1st transfer roller/Y,M,C is retracted to be switched to the black
mode. An advantage during retraction of the 1st transfer roller is that chance of the developing unit (Y, M, C) and drum unit (Y, M, C)
being worn as a result of wasteful rotation can be reduced.
When printing in black with color mode (effecting black printing with the four PC drums rotating)
[1]
→
[1] Color mode
[3] Color mode
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 7. 1ST
[1]
[2]
→
O-53
[2] 1st transfer roller/M
[4] 1st transfer roller/K
[6] Photo conductor/C
[8] Photo conductor/Y
- -
- -
[3]
[2] Color mode
- -
TRANSFER SECTION