ALL ABOUT
LASER PRINTER
This printer is also known as
page printer because they receive their print job one page at a type. There are two major types of laser printer
1)
The first use a laser to scan the image on two a
organic photo conductive drum (OPC)
2)
The second use an array of led to create the
image on the drum. Xerox invented this
printer in 1971 but the first laser printer was introduced y hp in 1984.
BASIC COMPONENTS
Tonner
cartridge
:Tonner is a black carbon substance mixed with polyster resin to make it
flow better and iron oxide particles to make it sensitive to electrical
charge. Tonner contain a medium called
developer which carries the tonner until it is used by the EP(Electro
photography) process.
The tonner also contains the opc
drum. The drum is coated with a photo
sensitive material that hold a static charge unless it is exposed to light. The drum also contains a cleaning blade known
as doctor blade. That continuously scraps the unused tonner from the drum.
Load
Scanner Assembly:The laser scanning assembly contains a laser
LED and a scanning mirror that shines on
the particular area of an OPC drum. When
it does that the drum discharges the charge onlyu to the areas that was
scanned.
High
voltage Power Supply :The EP process require high voltage
electricity hvps provides high voltages to the primary and transfer
corona. This component converts 240 VAC
into plus +600 VDC and -600 VDC.
DC power
supply : The Hpvs Cannot Provide Power To Together Components
Which Runs At A Lower Voltage The Pc
Power Supply Provides 3 Voltages +5 Volt Dc, -5vdc, Used By Logic Circuit Board
+24v Used By Paper Transport Motor And Cooling Fans
Paper
Transport Assembly : This assembly is responsible for moving the
paper into the printer. It consist of a motor and several rubber roller. The first is the paper feed roller or paper
pickup roller, which rub against the paper and pushes one sheet into the
printer. The second is registration
roller.
This roller moves the paper
while the opc drum prints. The third is
the fuser roller it moves the paper in very small increments while the fuser
assembly makes the print permanent.
Corona
Assembly : The first is
primary corona, which is a electrical coil now becomes a roller which charges
the opc drum with -600v. The second one
is transferred corona, which charges the
paper with +600vdc.
This two corona assemblies are
powered by hvps. There is a static
charges eleminator strip that discharge the static charge from the paper otherwise
paper jam will frequently occur.
Fusing
Assembly : The Assembly Contains A Halogen Lamp Which Generate
Heat Upto 200 Centigrade It Also Contains A Teflon Coated Aluminium Roller For
Fusing And A Rubber Pressure Roller .
As The Paper Passes Between The Two Roller, The
Pressure Roller Pushes The Paper Against The Fusing Roller Which Melts The
Tonner Into Paper
Control
Circuit Board : It is a motherboard of a ;printer i.e. Mounted under the
printer it converts signals from the computer or that various assemblies can
understand the board has connector for each type of interface and coils for
each assembly.
Ozone
Filter : High Voltage Create Ozone Gas It Is A Chemical Reactive
Gas That Effects And Reduce The Life Of Laser Printer Components Every
Printer Contains An Ozone Filter Which
Reduce the Ozone Gas While Maintenance Of printer This Filter Must Be Clean.
You can print on a different printer as a test. best printers
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