Read Sharp AL-840 (serv.man3) Service Manual online
No.
Parts
Note
Code
Signal name
Name
Type
Function/operation
Active condition
1
PE SENSOR
PEMP IN
Paper empty
detector
detector
Photo
transmission
sensor
transmission
sensor
Detects paper on the paper tray.
LOW (0V) when
paper is detected.
paper is detected.
2
Paper guide
Adjust the paper width.
3
Paper feed tray
Sets the print paper. (Capacity:
XXX sheets)
XXX sheets)
4
Paper release
lever
lever
Put this lever straight to set
paper to release paper feed. Put
this lever down to enable paper
feed.
paper to release paper feed. Put
this lever down to enable paper
feed.
5
PUS
PUS
Paper feed clutch
solenoid
solenoid
Controls (on/off) the main motor
drive for the paper feed roller.
drive for the paper feed roller.
6
Paper feed
release lever
release lever
When the paper feed lever is put
straight, this lever releases
paper feed solenoid drive. This
partially reduces stress to the
paper feed roller clutch in
removing paper.
straight, this lever releases
paper feed solenoid drive. This
partially reduces stress to the
paper feed roller clutch in
removing paper.
7
PIN SENSOR PIN
Paper in detector
Photo
transmission
sensor
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.
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.
paper is detected.
8
Paper feed roller
Feeds paper.
9
PAPER SIZE
SW
SW
PAPER SIZE
IN
IN
Paper width
detector
detector
Mechanical
switch (Micro
switch)
switch (Micro
switch)
Detects the paper width. This
signal controls the laser beam
radiation area.
signal controls the laser beam
radiation area.
LOW (0V) when
the max. width is
detected.
the max. width is
detected.
10
Paper pressure
plate
plate
Presses paper onto the paper
feed roller.
feed roller.
11
Paper pressure
spring
spring
Presses paper onto the paper
feed roller.
feed roller.
12
Paper separator
Separates paper in paper feed
operation.
operation.
13
Paper feed clutch
Mechanical
spring type
clutch
spring type
clutch
Controls ON/OFF of the paper
feed roller. (The paper feed roller
is driven by the paper feed clutch
solenoid and the main motor.
feed roller. (The paper feed roller
is driven by the paper feed clutch
solenoid and the main motor.
14
Paper feed clutch
lever
lever
Driven by the paper feed clutch
solenoid to control ON/OFF of
the paper feed clutch. Prevents
against reverse rotation of the
paper feed roller.
solenoid to control ON/OFF of
the paper feed clutch. Prevents
against reverse rotation of the
paper feed roller.
15
Paper feed clutch
joint
joint
Links the paper feed roller and
the paper feed roller clutch.
the paper feed roller clutch.
16
Paper feed clutch
sleeve
sleeve
Controls ON/OFF of the paper
feed roller. (The paper feed roller
is driven by the paper feed clutch
solenoid and the main motor.)
feed roller. (The paper feed roller
is driven by the paper feed clutch
solenoid and the main motor.)
17
Paper feed clutch
spring
spring
Transmits the paper feed clutch
rotation to the paper feed clutch
sleeve.
rotation to the paper feed clutch
sleeve.
18
Paper feed clutch
gear
gear
Transmits the main motor power
to the paper reed roller.
to the paper reed roller.
19
Paper separater
spring
spring
Applies a proper pressure to the
paper separater.
paper separater.
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