AL-840 (serv.man5). AL800 840 Service Manual-External view internal structure Machine operation - Sharp Copying Equipment Service Manual (repair manual). Page 4

No.

Parts

Note

Code

Signal name

Name

Type

Function/operation

Active condition

1

PE SENSOR

PEMP IN

Paper empty
detector

Photo
transmission
sensor

Detects paper on the paper tray.

LOW (0V) when
paper is detected.

2

Paper guide

Adjust the paper width.

3

Paper feed tray

Sets the print paper. (Capacity:
XXX sheets)

4

Paper release
lever

Put this lever straight to set
paper to release paper feed. Put
this lever down to enable paper
feed.

5

PUS

PUS

Paper feed clutch
solenoid

Controls (on/off) the main motor
drive for the paper feed roller.

6

Paper feed
release lever

When the paper feed lever is put
straight, this lever releases
paper feed solenoid drive. This
lever reduces stress to the paper
feed roller clutch in removing
paper.

7

PIN SENSOR PIN

Paper in detector

Photo
transmission
sensor

Detects whether the fed paper is
transported to the transfer
position or not. By the timing of
this detector signal, the relative
positions of paper and print
image are controlled.

LOW (0V) when
paper is detected.

8

Paper feed roller

Feeds paper.

9

PAPER SIZE
SW

PAPER SIZE
IN

Paper width
detector

Mechanical
switch (Micro
switch)

Detects the paper width. This
signal controls the laser beam
radiation area.

LOW (0V) when
the max. width is
detected.

10

Paper pressure
plate

Presses paper onto the paper
feed roller.

5 – 4