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AL-2020/2035/2040/2050/2060  UNPACKING AND INSTALLATION  5 - 12

10) Attach the Scanner motor metal plate cushion covering the bot-

tom part of the Scanner motor lower mylar.

Note: The hole under the motor unit should be covered.

Attach the cushion to cover the gap between the mylar and the
metal plate (the yellow mark).

Press the cushion with a sharp-pointed stick or something to fill
the gap between the mylar and the metal plate.

11) Attach the motor connector and the snap band to the original

position.

12) Attach the Scanner UPG mylar J3 to cover the hole on the right

side of inside of the scanner.

Note: The mylar should cover the hole shown by the arrow in

the diagram.

Attach along with the bent part of the metal plate and align the
edge of the mylar with the line shown in the diagram (the yellow
line in the diagram).

13) Attach the Fan housing cushion to the cooling fan at the posi-

tion shown in the diagram below.

Cover the top and the right side of the fan housing when you
see the fan housing from the backside of the machine.

Note: Please make sure the double-sided tape is not exposed

where the cushion is sticking out from the edge of the fan
housing.

Attach the cushion leaving 3 - 7mm from the edge so that the
gap between the Fan housing cushion and the filter of the rear
cabinet is filled for sure.

14) Attach the parts removed in the items 1), 2), and 3).

Stick the lower part of the cushion to the mylar, too.

A

View from
the arrow A

Back side

Attach the cushion leaving 3 - 7mm
from the edge.

Reference position

3 - 7mm

AL-2020/2035/2040/2050/2060  COPY PROCESS  6 - 1

(20 microns thick)

Aluminum drum

 

Pigment layer (0.2
to 0.3 microns thick)

An OPC drum is used for the photoconductor.
(Structure of the OPC drum layers)

OPC layer

Main charger

Laser beam

MG roller

Cleaning blade

Drum

Transfer unit

Resist roller

Exposure

Main high voltage unit

Saw tooth

Charge

Drum

Cleaning

Cleaning blade

Waste toner box

Paper release

Fusing

Separation

Heat roller

Heater lamp

Transfer

Transfer charger

Transfer high
voltage unit

Developing

Toner

Developer

Print process

Paper transport route

Semiconductor laser

Manual feed

PS roller

Focus correction lens

Electrode

Synchronization

with drum

Cassette

paper feed

To face
down tray

AL-2020/2035/2040/2050/2060  COPY PROCESS  6 - 2

This printer is a non-impact printer that uses a semiconductor
laser and electrostatic print process. This printer uses an OPC
(Organic Photo Conductor) for its photoconductive material.

First, voltage from the main corona unit charges the drum surface
and a latent image is formed on the drum surface using a laser
beam. This latent image forms a visible image on the drum surface
when toner is applied. The toner image is then transferred onto the
print paper by the transfer corona and fused on the print paper in
the fusing section with a combination of heat and pressure.

Step-1: Charge

Step-2: Exposure

∗

Latent image is formed on the drum.

Step-3: Developing

Latent image formed on the drum is then changed into
visible image with toner.

Step-4: Transfer

The visible image (toner image) on the drum is transferred
onto the print paper.

Step-5: Cleaning

Residual toner on the drum surface is removed and col-
lected by the cleaning blade.

Step-6: Optical discharge

Residual charge on the drum surface is removed, by
semiconductor laser beam.

A uniform negative charge is applied over the OPC drum surface
by the main charging unit. Stable potential is maintained by means
of the Scorotron charger.

Positive charges are generated in the aluminum layer.

A Laser beam is generated from the semiconductor laser and con-
trolled by the print pattern signal. The laser writes onto the OPC
drum surface through the polygon mirrors and lens. The resis-
tance of the OPC layer decreases for an area exposed by the laser
beam (corresponding to the print pattern signal). The beam neu-
tralizes the negative charge. An electrostatic latent image is
formed on the drum surface.

About

DC5.5KV

(   580V/   400V)

OPC layer

Pigment

layer

Aluminum
drum

OPC layer

Pigment

layer

Aluminum
layer

Drum surface charge
after the exposure

Non-image area

Image area

Semiconductor laser

Exposure
(semiconductor laser)

AL-2020/2035/2040/2050/2060  COPY PROCESS  6 - 3

A bias potential is applied to the MG roller in the two component
magnetic brush developing method, and the toner is charged nega-
tive through friction with the carrier.

Non-image area of the drum surface charged with negative poten-
tial repel the toner, whereas the laser exposed portions where no
negative charges exist, attract the toner. As a result, a visible
image appears on the drum surface.

Toner is attracted over the shadowed area because of the develop-
ing bias.

The visible image on the drum surface is transferred onto the print
paper by applying a positive charge from the transfer corona to the
backside of the print paper.

Since the print paper is charged positively by the transfer corona, it
is discharged by the separation corona. The separation corona is
connected to ground.

Toner remaining on the drum is removed and collected by the
cleaning blade. It is transported to the waste toner collecting sec-
tion in the cleaning unit by the waste toner transport roller.

S

N

N

:Carrier (Magnetized particle)
:Toner (Charge negative by friction)
(N) (S) Permanent magnet

(provided in three locations)

MG roller

 

DC

400V   8V

About DC 5.2kV