Samsung ML-2251N/XAA Service Manual

Also see for ML-2210: Service manual

Contents

4-5Samsung ElectronicsSummary of productService Manual4.2 System Construction4.2.1 SummaryThe ML2250 consists of the following main functional components1) The FirmwareThis controls the whole printing process2) The Print Engine consisting ofa) Engine frameb) Paper feed mechanismThe paper mechanism cosists of a 250sheet main cassette, multi-purpose paper tray, pickup rollers, frictionpads and feed rollers. Together with sensors in the feed path these serve to control paper registration andguide the paper through the Image transfer, image development, image fusing and exit assemblies. Thepaper path has an anti-static connection to earth to eliminate paper feed problems due to static charge onthe paper.c) Main drive mechanismThe main drive is a Bi-polar 2 phase motor. It drives the OPC, Paper Pick-up and paper feed rollers using agear train mechanismd) Image development unitUsing a Laser Scanning Unit (LSU) this section of the mechanism creates the image on the OPC drum(part of the integrated toner cartridge).e) Image transfer unitThe function of the this unit uses High Voltages supplied by the HVPS to move the image from the developerunit onto paper.f) Image fusing unitThe function of this unit is to permanently fix the toner image onto the paper. This is achieved usibg atemperature controlled heating unit (the fuser).g) Electronics PBA includingi) Main control board consisting of(1) Main processor Asic (166MHz SPGPm)(2) Memory parts (Flash Rom containing the control program and DRAM for working memory)(3) Engine interface parts (motor control, fuser control, HVPS control, sensors etc)(4) PC Interface (USB , Parallel, Network – wired and wireless)(5) Bus, DMA and I/O handlingii) Operators paneliii) PC Interface