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Service Manual
Product spec and feature
2-10
- SMPS Board & HVPS Board
These are integrated into a singe PBA. The Power Supply uses the 110VAC/220VAC supply voltage to
generate the DC Voltages used by the system. The SMPS has 3 output channels (+5V, +12V, +24V, +24VS) and
supplies the Main Board and the OPE Board.
The HVPS creates the high voltages (THV/MHV/Supply/Dev) used for the electrophotographic process. The high
voltage is created from the 24VS line from the SMPS. High Voltage output is supplied to the Toner, the OPC
Cartridge and the Transfer Roller.
- OPE Board
The Operation Panel is driven by its own internal program using the OPE MICOM chip separate from the Main
Board processor. Data is transferred using the UART Port in the Main Controller serially. This unit
consists of the MICOM, the Key Pad Matrix and the LCD.
- Toner Cartridge
The Toner Cartridge consists of integrated Exposure and Developer units. The Exposure Unit consists of the OPC
Drum and the Charge Roller, and the Developer Unit consists of the toner particles and its tank, the Supply Roller
and the Developer Roller.
- LSU (Laser Scanner Unit)
This is the core of the laser printer. It converts the video data received from the computer into an electrostatic
latent image on the surface of the OPC drum. This is achieved by controlling the laser beam and exposing the sur-
face of the OPC drum to the laser light. A rotating polygon mirror reflects the laser light onto the OPC and each
side of the mirror is one scan line. The OPC drum turns as the paper feeds to scan the image down the page.
The /HSYNC signal is created when the laser beam from LSU reaches the end of the polygon mirror and this sig-
nal is sent to the controller. The controller detects the /HSYNC signal to adjust the vertical line of the image on
paper. In other words after the /HSYNC signal is detected the image data is sent to the LSU to adjust the left mar-
gin on the paper.
- Toner Transfer
Toner is transferred from the OPC drum onto the paper using a PTL (Pre-transfer Lamp) and a transfer roller. The
PTL shines light onto the OPC, this reduces the electrical charge on the surface of the OPC
surface and improves the efficiency of the transfer.
The transfer roller transfers toner from the OPC drum to the paper.
Life span: Print over 100,000 sheets (at 15~30ºC)
- Fuser
This consists of a heat lamp, heat roller, pressure roller, thermistor and thermostat. By use of heat and pressure
toner is caused to melt and adhere to the paper surface in order to complete the printing process.