Konica Minolta bizhub C658 Service Manual page 1794

bizhub C658/C558/C458/C368/C308/C258
[5] Index board (INDEXB)
[7] G2 lens
(2) bizhub C658/C558/C458
• After a print cycle has been started, when the stable rotation signals of photo conductor and polygon motor are detected, a laser ON
signal is output from the MFP board.
• The laser ON signal causes each laser diode to turn ON and emit a laser beam.
• The K laser light that is irradiated to the index board after it passes through the return mirror (light source), cylindrical lens, polygon
mirror, G1 lens, index mirror, return mirror (index), and index lens generates an index signal.
• This index signal has a function of keeping the same laser light emission timing per every one line in the main scanning direction.
• The index signal is generated with the K laser light only. The laser light emission timing for other colors is determined with reference to K.
• If the index signal is not detected within a predetermined period of time, the machine determines that it is a laser emission fault,
displaying "trouble code: C4501 laser malfunction".
• The machine continuously monitors the index signal. If the index signal cannot be detected at regular intervals, the machine determines
that it is a laser emission fault, displaying "trouble code: C4501 laser malfunction".
[4] [5] [6] [7] [8]
[3]
[2]
[1]
[10]
[9]
[1] Laser diode/K (LD/K)
[3] Laser diode/M (LD/M)
[5] Cylindrical lens
[7] Index board (INDEXB)
[9] G1 lens
3.3.4 Laser emission stop
Emission of the laser beam is stopped if any of the following conditions is encountered during printing:
• End of a print job
• Laser emission of Y, M, and C is stopped if the print mode is changed from color to black during printing.
• The front door or any other door is opened.
• A misfeed occurs.
• A malfunction occurs.
3.3.5 Laser emission area
(1) Main scanning direction
• The print start position in the main scanning direction is determined with the main scanning print start signal (HSYNC) that is output from
the printer control board, and with the width of the paper.
• The laser emission area is determined by the paper size. However, the void image area is defined as both edges of the paper.
(2) Sub scanning direction
• The print start position in the sub scanning direction is determined with the image write signal (VSYNC) that is output from the MFP
board. Also, it is determined with the system speed.
• The laser emission area is determined by the paper size. However, the void image area is defined as both edges of the paper.
Modes
Copy
PC Print
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 3. WRITE
Main scanning direction
3 mm (1/8 inches) from the edge of the paper
3 mm (1/8 inches) from the edge of the paper
4.2 mm (3/16 inches) from the edge of the paper
4.2 mm (3/16 inches) from the edge of the paper
[6] Index lens
[8] Polygon motor (M14)
[2] Laser diode/C (LD/C)
[4] Laser diode/Y (LD/Y)
[6] Return mirror (Index)
[8] Index lens
[10] Polygon motor (M14)
Void image area
4.2 mm (3/16 inches) from the leading edge of the
paper
3 mm (1/8 inches) from the trailing edge of the paper
4.2 mm (3/16 inches) from the leading edge of the
paper
4.2 mm (3/16 inches) from the trailing edge of the paper
O-19
SECTION (PH SECTION)
Sub scanning direction