Samsung CLP-510_XEV Operation Instruction & Installation
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Samsung Electronics
System Outline
Service Manual
5 System Outline
This chapter describes the functions and operating principals of the main components.
5.1 CLP (Color Laser Printing) Process
5.1.1 OPC Drum Unit (Charge Section)
The OPC Unit is the image formation unit and it consists of the OPC drum, waster toner assembly, charge
roller assembly, etc. (see diagram below).
LSU
Charge Bias
Waste Toner Tank
Cleaning Roller
Cleaning Blade
Charge Roller
OPC Drum
-1000V ~ -1500V
Charge Roller
HVPS
1) Structure
* OPC drum: The laser light coming from the LSU forms an latent electric image on the surface of
the OPC drum.
* Cleaning Blade: Removes remaining unwanted toner from the OPC drum.
* Waste toner tank: Collects and stores the waste toner.
* Charge roller: The charge roller is charged to a negative high voltage (-1KV~1.5KV) It is in con-
tact with the OPC drum and produces a uniform (-) voltage on its surface of approximately -500~-
800V.
2) Type
* Life span: 50K Images (Color 12.5K)
* Waste toner removal: Transferred to a user replaceable tank
* Waste tank sensors: LED type, detects tank present and tank full
* OPC drum diameter: 120mm
* Power: Main motor (BLDC)
* Charging method: Charge roller
* Eraser method: LED lamp (+5V/2Pin)
* PTL: LED lamp (+5V/2Pin)
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System Outline
Samsung Electronics
Service Manual
5.1.2 LSU (Exposure)
The bitmap image data stream is used to switch the LSU data beam. Where white paper is
required the beam is off, where ink is required the beam is turned on. When the laser is on
and the beam strikes the OPC drum surface the charge is reduced to -50V, where the beam is
switched off the charge on the OPC surface remains at -600V. In consequence a latent image is
formed on the drum surface.
-600V -600V
-50V
Reflecting MirrorPolygon Motor
(30,000rpm)
Unexposed Expesed Unexposed
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Samsung Electronics
System Outline
Service Manual
5.1.3 Toner Cartridge (Development Section)
In the development stage toner particles are transferred from the toner cartridge onto the surface
of the OPC drum. The OPC drum and the developer roller rotate in opposite directions. Toner on
the developer roller is charged to the developing voltage (-370V ± 3%). Toner is attracted to the
OPC drum in those areas where the OPC drum surface charge is -50V. Toner is not attracted to
those areas of the surface carrying a -600V charge.
1) Type
* Developing method: Non-magnetic, Mono-component developing system.
* Toner cartridge order: K, Y, M, C from top.
* Developing sequence: Y, M, C, K
* Life span: 7K(K) / 5K(C, M, Y)
* Power: DEVE motor (BLDC)
* Power transmission: Electric clutch
* Dot counting method
DEV . - Black
DEV . - Yellow
DEV . - Magenta
DEV . - Cyan
DEV . - Black
DEV . - Yellow
OPC
DEV . - Magenta
DEV . - Cyan
OPC
Drum
OPC
Dev Roller
Developing
Voltage
Dev Gap
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System Outline
Samsung Electronics
Service Manual
2) Developing state of color
The page image is built up from each of the 4 colors and transferred to the paper as described below.
> Developing sequence: Y, M, C, and K
1) A latent image containing only yellow toner is
created on the OPC drum and then transferred
onto the ITB.
2) A latent image containing only magenta toner
is created on the OPC drum and then transferred onto the ITB to add to the yellow image
already in the ITB.
3) A latent image containing only cyan toner is
created on the OPC drum and then transferred
onto the ITB, adding to the 2 colors already
present on the ITB
4) A latent image containing only black toner is
created on the OPC drum and then transferred
onto the ITB, creating an image on the ITB
consisting of the 4 colors.
5) The Image on the ITB is secondly transferred
onto paper using the T2 transfer roller.
6) The image on the page is then fused and the
paper is ejected into the output tray.
3) Toner cartridge empty detection
Software Dot count.
Developing and Image Transfer
Developing and Image Transfer
Developing and Image Transfer
Paper Take-up
Fusing
Cleaning of
Image Transfer Belt
Paper Exit
Image Transfer to page
Developing and Image Transfer
Yellow ColorYellow Color
Magenta ColorMagenta Color
Cyan ColorCyan Color
Blacl BolorBlack Color
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Samsung Electronics
System Outline
Service Manual
5.1.4 Image Transfer Section
The toner image formed on the OPC drum is transferred to the ITB (Image Transfer Belt), this is called the
primary image transfer. When the final image has been built on the ITB it is transferred onto paper, this is
called the secondary image transfer.
1) Structure
DUPLEX
OPC DRUM
1
2
3
5
4
Paper Path
NO. Name Description
1. Image Transfer Belt Used to build up the 4 color image from the OPC drum.
Colors are transferred in the order Y, M, C, K
2. Image Transfer Belt cleaner After the final image is transferred onto paper any waste
toner is removed from the transfer belt using this cleaning
blade
3. PTL (Pre-Transfer Lamp) Reduce the electric potential of OPC Drum surface before
primary image transfer the image on the OPC Drum.
4. Image Transfer Roller (T2 Roller) This transfers the final toner image on the image transfer belt
to paper.
5. ITB Home Sensor This sensor is used to ensure that each of the 4 color
images starts at exactly the same point on the ITB. It works
by detecting a fixed point on the belt.
ITB Home Sensor
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