Paper Feed Control - Konica Minolta bizhub 500 Service Manual

15. BYPASS SECTION
15.3.3

Paper feed control

A. Pick-up control
When the feed motor (M9) is turned ON by the print start signal [1], the pick-up solenoid /BP (SD1) and the ver-
tical conveyance clutch (CL3) also turn ON a specified period of time after that. When SD1 turns ON, the lift
plate goes up [2] and paper comes into contact with the feed roller. After that, the feed clutch /BP (CL6) turns
ON. Through these operations, the driving force of M9 is transmitted to the feed roller and the vertical convey-
ance roller to conduct the pick-up [3] and the vertical conveyance [4] of the 1st sheet of paper. When paper is
conveyed and the vertical conveyance sensor (PS2) turns ON, CL6 turns OFF to complete the pick-up opera-
tion. However, since CL3 keeps turning ON, paper is conveyed to the registration section by the vertical convey-
ance roller. In this way, when the registration sensor (PS1) turns ON, CL3 turns OFF a specified period of time
after that. The pick-up [6] and the vertical conveyance [8] of the 2nd and succeeding sheets of paper are con-
ducted using the paper feed request signal [5] as a starting point. When the last paper turns ON PS2, SD1 turns
ON to bring down [7] the lift plate.
Feed motor (M9)
Registration sensor (PS1)
Vertical conveyance sensor (PS2)
Pick-up solenoid /BP (SD1)
Feed clutch /BP (CL6)
Vertical conveyance clutch (CL3)
[1] Print start signal ON
[2] Lift plate goes up
[3] Pick-up of the 1st paper
[4] Vertical conveyance of the 1st paper
54
[1] [3] [4]
[2]
[5]
[6]
[7]
[8]
Theory of Operation Ver1.0 Feb.2006
[5] [6] [8]
[7]
Paper feed request signal
Pick-up of the 2nd paper
Lift plate goes down
Vertical conveyance of the 2nd paper
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