Samsung ML-1665 Service Manual

Also see for ml-1660: User guide

Contents

Product spec and featureService Manual 2-19 Samsung Electronics(c) Sensor Input Circuit■ Paper Empty SensingThe Paper empty sensor on the tray detects the state of paper empty and the state of paper width i.e. narrowpaper width or not.■ Regi SensingN/A■ Paper FeedingWhen paper passes the actuator (feed sensor part), it detects the signal of Photo interrupter, informs thepaper feeding state 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 displayOrange color).■ Paper Exit SensingN/A■ Cover Open SensingThe Cover open sensor is located on the HVPS. After the top cover is opened, +24VS (Solenoid, Main Motor,Polygon motor part of LSU and HVPS), which is supplied to the each unit, is cut off.In case, the red will be ON for informing the facts to user.■ SOLENOID DrivingClutches are driven by turning on TRs, which is controlled by CPU. The diode in the Clutch driving circuitsprotects TR driven from the noise pulse, which is occurred when the solenoid is de-energized.■ Motor DrivingThe main motor driving circuits is on the main boardThere is motor driver IC on the main board control the step motor.