Samsung MSYS 5150, Service Manual, Page: 36 / 210

4. Theory of Operation
4-1 Engine Configuration
4-1-1 Video Controller Board
Video Controller Board receives image data from the
host computer and converts them to a
bitmap(binary) image, which is sent to the
Engine(Controller) Board.
4-1-2 Engine Controller Board
Engine Board receives the video data from the
Controller Board, and then that sends current image
to LSU and controls the electrophotography process
for printing.
4-1-3 HVPS Board
HVPS board generates THV/MHV/BIAS high
voltages, apply it to Developer unit. And LSU,
Cover Open Sensor interface signals connect via this
board from Engine Control Board to each units.
4-1-4 Joint Board
Joint Board Contains Main Motor and Clutch and
Pre-Transfer Lamp driving circuit, New Developer
and Paper Empty, Paper Exit Sensing circuit, and
connects with Engine Controller Board.
4-1-5 Developer Cartridge
Developer (Cartridge) creates the image via the
electrophotography process. The Charge Roller,
OPC Drum, Developer Roller, Supply Roller and
Toner constitute a single unit.
4-1-6 LSU(Laser Scanner Unit)
Under control of the Engine, controls the laser beam
and the OPC Drum exposure and rotation. The OPC
Drum is synchronized and rotating with the same
speed as the paper. When laser beam reaches the
position of the Scanning Mirror, it creates a line.
Synchronization Signal(HSYNC), which is sent to
the Engine Board which transfers image data to LSU
and synchronizes the vertical scanning line with the
printed page.
4-1-7 Transfer
It constitutes the PTL(Pre-transfer Lamp) and the
Transfer Roller. The PTL exposes the light to the
OPC drum and lowers the OPC drum surface
potential, and transfer efficiency become higher. The
Transfer Roller transfers Toner on the OPC Drum to
the paper.
4-1-8 Fuser
It constitutes the Heat Lamp, Heat Roller, Pressure
Roller and Thermistor, thermostat, and causes the
Toner to adhere to the paper.
Samsung Electronics 4-1