Samsung SF5800 Disassemble

4. Theory of Operation

4-1 Engine Configuration

4-1-1 Video Controller Board

V ideo 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 r eceives the video data from the
Controller Board, and then that sends current image
to LSU and controls the electr ophotography 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 Contro l 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 cir cuit, and
connects with Engine Controller Board .

4-1-5 Developer Cartridge

Developer (Cartridge) creates the image via the
electr ophotography process. The Charg e Roller,
OPC Drum, Developer Roller, Supply Roller and
Toner constitute a single unit.

4-1-6 LSU(Laser Scanner Unit)

Under contro l o f 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 r eaches the
position of the Scanning Mirro r, it cr eates 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. T he
Transfer Roller transfers Toner on the OPC Drum to
the paper.

4-1-8 Fuser

It constitutes the Heat Lamp, Heat Roller, Pr essur e
Roller and Thermistor, thermostat, and causes the
Toner to adhere to the paper.

Samsung Electronics 4-1

4-2 Samsung Electronics

Theory of Operation