Operation; Up/Down Control; Paper Size Detection Control - Konica Minolta BIZHUB 750 Service Manual

16. BYPASS TRAY

16.3 Operation

16.3.1

Up/down control

A. Up operation
The bypass tray lift motor (M20) drives the fan-shaped gear to bring up the lift plate.
B. Down operation
The bypass tray lift motor (M20) drives the fan-shaped gear to bring down the lift plate.
C. Operation timing
(1) Up operation
A print start signal rotates the bypass tray lift motor (M20) in the normal direction to bring up the lift plate. When
the lift plate goes up and the upper most paper on the lift plate turns ON the upper limit sensor/bypass (PS34),
M20 turns OFF to stop the up operation.
When PS34 is turned OFF from ON by the paper feed operation, M20 turns ON again to bring up the lift plate.
When PS34 is turned ON by this operation, M20 turns OFF to stop the up operation.
(2) Down operation
When there remains no paper in the bypass tray and the paper empty sensor/bypass (PS33) turns OFF, the
bypass tray lift motor (M20) rotates in the reverse direction to bring down the lift plate. When the lift plate goes
down and the lower limit sensor/bypass (PS35) turns ON, M20 turns OFF to stop the down operation.
16.3.2

Paper size detection control

A. Size detection in the main scan direction
The size detection of paper in the main scan direction is made according to the position of the guide plate con-
nected to the paper size VR/BP (VR5).
B. Size detection in the sub scan direction
The size detection of paper is made by the combination of the paper size sensors /Fr3 (PS31) and the paper
size sensors /Rr3 (PS32) that turn ON and OFF.
Paper size
8.5 x 11 or less
A4R to B5R
8 x 13 or more
56
Theory of Operation Ver1.0 Aug.2005
PS31
ON/OFF
OFF
ON
ON
PS32
ON/OFF
OFF
OFF
ON