Read Sharp AL-840 (serv.man5) Service Manual online
No.
Parts
Model
Note
14
PIN
SENSOR
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 the paper and the
print image are controlled.
transported to the transfer
position or not. By the timing of
this detector signal, the relative
positions of the paper and the
print image are controlled.
LOW (0V) when
paper is detected.
paper is detected.
15
Developing roller
Attaches toner to the latent
electrostatic images on the OPC
drum to convert them into visible
images.
electrostatic images on the OPC
drum to convert them into visible
images.
16
Transfer roller
Transfers toner images on the
OPC drum to paper.
OPC drum to paper.
17
Transfer pressure
spring
spring
Applies a pressure to the
transfer roller, paper, and the
OPC drum to improve transfer
efficiency.
transfer roller, paper, and the
OPC drum to improve transfer
efficiency.
18
Separation electrode
Reduces the paper charging
potential to facilitate separation
of paper from the OPC drum.
potential to facilitate separation
of paper from the OPC drum.
19
Temperature fuse 1
(fusing section)
(fusing section)
Mold
Assures safety in overheating.
20
Temperature fuse 2
(fusing section)
(fusing section)
Mold
Assures safety in overheating.
21
Pressure roller
Applies a pressure to the heat
roller and paper to improve
fusing efficiency.
roller and paper to improve
fusing efficiency.
22
Fusing pressure
spring
spring
Applies a pressure to the heat
roller paper, and the pressure
roller to improve transfer
efficiency.
roller paper, and the pressure
roller to improve transfer
efficiency.
23
Paper exit roller
Discharges paper after fusing.
24
POUT
POUT IN
Paper exit detector
Photo
transmission
sensor
transmission
sensor
Detects discharge of paper.
LOW (0V) when
paper is detected.
paper is detected.
25
HL
Heater lamp
Halogen lamp
Heats the heat roller.
100V series
100V 500W
120V series
120V 500W
200V series
230V 500W
26
Heat roller
Toner on the paper is heated
and fused onto the paper.
and fused onto the paper.
27
Separation pawl
Separates paper from the fusing
roller mechanically.
roller mechanically.
28
MHPS
MHPS
Scanner home
position sensor
position sensor
Photo
transmission
sensor
transmission
sensor
Detects the scanner home
position. By this signal the image
scanning operation is controlled.
position. By this signal the image
scanning operation is controlled.
HIGH (5V) when
the home position
is detected.
the home position
is detected.
29
No. 2 mirror
Leads document images to CCD
30
SL SENSOR
PDA/PDK
Scanner lamp light
quantity sensor
quantity sensor
Photo diode
Detects the scanner lamp light
quantity. This signal is inputted
to the scanner lamp control PWB
to control the scanner lamp drive
voltage to maintain a constant
level of light quantity.
quantity. This signal is inputted
to the scanner lamp control PWB
to control the scanner lamp drive
voltage to maintain a constant
level of light quantity.
HIGH (5V) when
the home position
is detected.
the home position
is detected.
31
Scanner lamp
Radiates light necessary for the
CCD to scan the document
images.
CCD to scan the document
images.
32
Lens
Transfers document images to
CCD.
CCD.
33
CCD
SENSOR
SENSOR
CCD OUT
CCD (image) sensor
CCD
Scans the document images
(photo signals) and converts
them into electrical signals.
(photo signals) and converts
them into electrical signals.
Digital signal (8Bit)
34
No. 1 mirror
Lead document images to CCD.
35
No. 3 mirror
Lead document images to CCD.
36
Paper separater
spring
spring
Applies a proper pressure to the
paper separater
paper separater
5 – 13
Click on the first or last page to see other AL-840 (serv.man5) service manuals if exist.