Read Sharp AL-840 (serv.man5) Service Manual online
h. Cross sectional view
No.
Parts
Model
Note
Code
Signal name
Name
Type
Function/operation
Active condition
1
Fusing temperature
sensor
sensor
Thermistor
Detects the heat roller surface
temperature.
temperature.
Analog signal (2.0
∼
5.0V)
2
No. 3 mirror (LSU)
Leads the laser beam to the
OPC drum.
OPC drum.
3
No. 1 mirror (LSU)
4
No. 2 cylindrical lens
Corrects the laser beam
deflection caused by variations
in the surface angle of the
scanning mirror. Also prevents
agaist dirt in the optical section.
deflection caused by variations
in the surface angle of the
scanning mirror. Also prevents
agaist dirt in the optical section.
5
OPC drum
OPC
Forms latent electrostatic
images.
images.
6
Laser scanner
Scans laser beams to perform
imaging.
imaging.
7
frror (No. 2 mirror)
(LSU)
(LSU)
Corrects the laser beam form
and pitch.
and pitch.
8
Laser diode
Generates the laser beam.
(Controls ON/OFF for imaging.)
(Controls ON/OFF for imaging.)
9
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.
10
Paper pressure
spring
spring
Presses paper onto the paper
feed roller at a proper pressure.
feed roller at a proper pressure.
11
Paper pressure plate
Presses paper onto the paper
feed roller at a proper pressure.
feed roller at a proper pressure.
12
Paper feed roller
Feeds paper.
13
Paper separator
Separates paper in paper feed.
29)
35)
28) MHPS
30) SL SENSOR
31)
34)
32)
33) CCD SENSOR
1)
2)
3)
4)
5)
6)
7)
8)
9) PE SENSOR
10)
11)
12)
13)
14) PIN SENSOR
15)
16)
17)
22)
21)
23)
24) POUT
25)
26)
18)
36)
5 – 12
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