DOWNLOAD Sharp AR-810 (serv.man12) Service Manual ↓ Size: 877.36 KB | Pages: 9 in PDF or view online for FREE

Model
AR-810 (serv.man12)
Pages
9
Size
877.36 KB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Laser optical unit
File
ar-810-sm12.pdf
Date

Sharp AR-810 (serv.man12) Service Manual ▷ View online

AR-651/810  LASER & OPTICAL UNIT  8 - 1
8.  LASER & OPTICAL UNIT
8. 1.  General Description
The laser optical unit radiates the laser beam onto the photoconductive drum responding to the digital
image signals, which have been sent from the scanner, printer controller, etc., to create a latent image.
The Image signal is converted into the light emission signal of the laser diode on the laser driver board,
and it is radiated on the drum through the optical elements such as cylinder lenses, polygonal mirror and f
Ø
lens.
Caution: This unit must not be disassembled in the field since it is finely adjusted and very sensitive to
dust.
[Laser optical unit exterior view]
AR-651/810  LASER & OPTICAL UNIT  8 - 2
f
Ø lens 1
f
Ø lens 2
Laser emission unit
1st laser diode
Finite focus lens
2nd laser drive PC board
2nd laser diode
Finite focus lens
Half mirror
Galvanic mirror
Cylinder lens
Polygonal motor
H-Sync detection PC board
1st laser drive PC board
Front side
H-Sync turnup mirror
1st turnup mirror
2nd turnup mirror
Slit glass
(Laser light exit)
Front side
Rear side
[Laser optical unit overview]
AR-651/810  LASER & OPTICAL UNIT  8 - 3
[CAUTION]
Do not place reflective tools near the path of the laser beam.
Take off your watches, rings, bracelets, etc. when handling the unit.
8. 2.  Structure
(1) Laser emission Unit
This unit consists of the laser diode, finite focus lens and aperture.
a. Laser diode
This laser diode features low droop, small laser variation and low threshold current.
An aperture determines the shape of the laser beam at the laser emission position.
The laser diode radiates the laser beam responding to the laser emission control (ON/OFF) signals
from the laser drive board. The laser beam which passed through the finite focus lens are focused
on the drum surface.
b. Caution:
The beam of the semiconductor laser is very weak (about 5 mW), but focused parallel rays can
create enough energy to be hazardous.
Some material of the components of the laser optical unit are metal. Since the unit is in a sealed
container, there is no danger of laser leakage during normal operation.
Note: The laser beam is not visible. Pay the close attention when handling the laser unit components or
performing operations such as adjustment of the laser beam. This kind of operation, which can be
very dangerous, must be performed only by specially trained staff.
The warning label shown below is attached on the front side left inner cover.
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AR-651/810  LASER & OPTICAL UNIT  8 - 4
(2) Polygonal motor unit
This unit consists of the polygonal motor, polygonal
mirror and polygonal mirror cover.
a. Polygonal motor
This motor rotates the polygonal mirror at high
speed.
The DC motor controls the rotation speed of the
mirror polygon as follows:
During standby
:10,000.000 rpm (approx.)
During copying
:37,216.337 rpm (approx.)
b.
Polygonal mirror
Laser beams emitted from the laser diode are
reflected by this mirror. As the polygonal mirror
is rotated by the polygonal motor, the reflected
laser light moves in sync with the rotation. The
direction of the movement is the primary
scanning direction of the image. Two scans are
performed on one plane of the polygonal mirror.
As the polygonal mirror has eight planes, sixteen
scans are performed in one rotation of the
polygonal mirror.
c. Polygonal mirror cover
Polygonal mirror cover reduces the wind
and noise, prevents adhesion of foreign objects
onto the mirror surface and releases heat.
Fig. 8.2-1
Laser light
Drum
Laser light
Drum
Laser light
Drum
(C)
(B)
(A)
2 scans are completed by completion of steps (A) to (C).
There are two lines of data are written on one plane of
the polygonal mirror. 16 lines of data can be written with
one rotation of the polygonal mirror.
Page of 9
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Sharp AR-810 (serv.man12) Service Manual ▷ Download

  • DOWNLOAD Sharp AR-810 (serv.man12) Service Manual ↓ Size: 877.36 KB | Pages: 9 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp AR-810 (serv.man12) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp AR-810 (serv.man12) Copying Equipment. Information contained in Sharp AR-810 (serv.man12) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.