Samsung ML-3471ND/XAX Service Manual page 25

Product specification and feature
2.2.2.6 LSU (Laser Scanner Unit)
The LSU unit is controlled by video controller. It scans the video data received from video controller with laser beam by
using the rotation principle of the polygon mirror to create the latent image on the OPC drum. It is the core part of LBP.
The OPC drum rotates as the same speed as the paper feeding speed. It creates the /HSYNC signal and sends it to the
engine when the laser beam of the LSU reaches the end of the polygon mirror, and the engine detects the /HSYNC signal
to arrange the vertical line of the image on the paper. After detecting the /HSYNC signal, the image data is sent to the
LSU to arrange the its margin on the paper.
The one side of the polygon mirror is one line for scanning.
2.2.2.7 Toner Cartridge
In the toner cartridge, the OPC unit and the developer unit are in a body.
The OPC unit has OPC drum and charging roller, and the developer unit has toner, toner cartridge, supply roller,
developing roller, and the blade.
2.2.2.7(a) Summary
Developing Method : Non magnetic 1 element contacting method
Toner : Non magnetic 1 element shatter type toner
Charging capacity : -39.1
Average OD : 8.5 0.5
Toner Qty : 125 gf/250gf (4k / 10k)
The life span of toner: 4k/10k sheets (ISO 19752 Pattern / A4 standard )
Toner Residual Sensor : Dot count with CRUM(CRU Monitor)
OPC Cleaning : Collect the toner by using cleaning blade+ FILM OPC
Handling of wasted toner : Collect the wasted toner in the cleaning frame by using cleaning blade
OPC Drum Protecting Shutter : None
Classifying device for toner cartridge: ID is classified by interruption of the frame channel.
2.2.2.7(b) Developing Roller
Roller type : conductive elastic roller
Rotary Speed : 203.06 mm/sec
Roller Bias : -220V ~ -400
Control Type : Bias PWM Control type
Roller material : Conductive NBR + Surface UV process
- Structure : Mono layer
- Resistance : 1.0E+03~ 1.5E+06
- Hardness : 52 5
- Valid Length : 228 mm
- OD : 14.07 mm
- Shaft material : SUS 303
- Surface roughness (Ra) : Ra 2.0 ~ 2.5
- Friction coefficient (u) : 0.1 ~ 0.5 (70gf, 50mm/min, OHP (3M,#CG3300))
- Life : 10,000 sheets or more
Service Manual
2-16
3 C/g (KAO meas. method)
(Toner)
20V
(N/N Condition)
0.05
(Circular-direction)
Samsung Electronics