Samsung ML-3471ND/XAX Service Manual

Also see for ML-3470D: Manual Del Usuario User guide

Contents

Service ManualProduct specification and feature2-20 Samsung Electronics2.2.3.1(d) Flash MemoryIt stores the system program and downloads system program through the PC Interface.Capacity : 16M Byte (NOR Flash)Access Time : 90nsPage read Time : 25ns2.2.3.1(e) SDRAMIt is used as swath buffer, system working memory area, etc. while Printing.Capacity : The 64M Bytes is for this model (64M : Printing System Working Memory Area)2.2.3.1(f) Sensor Input CircuitPaper Empty SensingThe Paper empty sensor (Photo Interrupter) on the HVPS informs the state of paper to CPU whether it is empty or notwith operation of the actuator.When cassette is empty, it detects the fact by reading the E20 of CPU, and then informs the fact by displaying the RED.MP SensingBy operation of Actuator on the frame, an individual MP Sensor (Photo interrupter) informs the state of paper to CPUwhether it is empty or not. It reads the D17 of CPU for recognizing paper in MP, and paper is fed from MP if there is.Paper Feeding/With Toner Cartridge SensingWhen paper passes the actuator (feed sensor part), it detects the signal of Photo interrupter, informs the paper feedingstate to CPU, and then sprays the image data after certain time.If it doesn t detect the feed sensor within 1sec. after paper is fed, paper Jam0 is occurred (LED will be display REDcolor). The fact whether the developer is inserted or not is detected by CRUM. After the developer is mounted, the sub-CRUM can read the information of toner cartridge from contact with CRUM involved in toner cartridge. If the information oftoner cartridge is invalid, it will show invalid sign on a LCD or LED.Paper Exit SensingIt detects paper state whether paper gets out from the set with operation of exit sensor on the HVPS and actuator on theframe. Paper detects the on/off time of exit sensor by reading D22 of CPU, and the normal operation or jam information isinformed to the CPU.The paper JAM2 is informed. (LED will be display RED color)Cover Open SensingThe Cover open sensor is located on the HVPS. After the front cover is opened, +24VS (DC fan, Solenoid, Main Motor,Polygon motor part of LSU and HVPS), which is supplied to the each unit, is cut off. The cover-open sensing is operatedby the D23 of CPU.In case, the red will be ON for informing the facts to user.