Read Sharp AL-1611 (serv.man8) Service Manual online
AL-1611/AL-1622
OPERATIONAL DESCRIPTIONS
6 – 3
Operation cycle
B. Outline of print process
The printer section of this machine employs the laser print system
where print images are formed by the laser beams on the OPC drum.
where print images are formed by the laser beams on the OPC drum.
A high voltage (corona) is applied from the main charger to the OPC
drum to charge the OPC drum.
Laser beams are radiated to the charged OPC drum to form electrical
images on the OPC drum. (Exposure)
images on the OPC drum. (Exposure)
(At that time, the print image on the OPC drum cannot be seen: latent
electrostatic image)
By the potential difference between the unexposed area and the latent
electrostatic images, toner ia attracted only to the images. (Developing)
electrostatic images, toner ia attracted only to the images. (Developing)
(At that time, the print image formed by toner on the OPC drum can be
seen. Visible images)
The toner image on the OPC drum is transferred on the print paper by
the transfer corona (voltage).
the transfer corona (voltage).
After that, the print paper with the toner image on it is subject to heat
and pressure in the fusing section to fuse the image on the paper.
This machine employs the following organic photoconductor (OPC)
drum.
drum.
C. Actual print process
(1) Charging
A high voltage is applied to the main charger, and negative charges are
discharged to the OPC drum. A screen grid is provided between the
main charger and the OPC drum, and negative charges are uniformly
main charger and the OPC drum, and negative charges are uniformly
charged on the OPC drum surface.
Positive charges are attracted by the negative electrode on the OPC
drum surface and excited in the aluminum layer in the OPC drum.
Paper exit roller
Paper exit
Heat roller
Fusing
Cleaning blade
Waste toner box
Separation
Cleaning
Separation charger
High voltage power
High voltage power
Main charger
Charging
Transfer
Transfer
Transfer charger
High voltage power
Laser scanning unit
Laser beam
Exposure
Developing
Synchronization
with drum
with drum
Resist roller
High voltage
power
power
Developing unit
Toner hopper
Developer
Toner
Cassette paper
feed
feed
Manual paper
feed
feed
(20microns thick)
Aluminium drum
Pigment layer (0.2
to 0.3 microns thick)
to 0.3 microns thick)
An OPC drum is used for the photoconductor.
(Structure of the OPC drum layers)
(Structure of the OPC drum layers)
OPC layer
DC5.5KV
(-525V/-400V)
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