AR-RB1 (serv.man2). AR-RB1 Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 9

AR-RB1  DESCRIPTION OF OPERATION  4 - 2

When the power to the copier is turned on, in order to confirm whether
or not there is paper in the transport path, the paper input motor, upper
turnover motor and lower turnover motor revolve for a predetermined
time.

Even after the predetermined time has passed, if all the transport sen-
sors are OFF and it is determined that there is no paper in the trans-
port path, if within a given period of time at least one transport sensor
turned ON, it is interpreted as paper being present in the transport path
(paper jam).

In this operation, the paper discharged from the copier is sent directly
to the paper exit tray or transported to the finisher.

When the paper input motor and upper turnover motor revolve, the
paper input roller and delivery roller rotate in the directions as shown in
the figure below to discharge the paper.

If the paper is delivered to the finisher, it is transported at the same
speed at which it is discharged from the copier.

As the paper is discharged to the paper exit tray, when the trailing
edge reaches a point 50mm from the delivery roller on the copier side,
the speed of the delivery roller increases, and the paper is discharged
to the tray.

Unit: mm/s

Sensor input, motor output, solenoid output timing is as below.

Paper input motor

BPOD

BPPD1

BPRD

BPPD2

Upper turnover motor

Lower turnover motor

Paper kind

Copier process 

speed

RB1 tray delivery 

speed

Thick paper 2

58.5

58.5

Envelope

117

117

OHP (priority: quality)

58.5

120

OHP (priority: speed)

117

160

Paper input roller

Delivery roller

BPOD

(Paper exit sensor)

BIM

(Paper-in motor)

BRM

(Upper reverse motor)

Process speed

BGSOL

(Gate solenoid)

Delivery speed

(Direction of 
paper-in)

(Direction of 
paper-out)