Samsung ML-1665 Service Manual page 29

Product spec and feature
(c) Sensor Input Circuit
■ Paper Empty Sensing
The Paper empty sensor on the tray detects the state of paper empty and the state of paper width i.e. narrow
paper width or not.
■ Regi Sensing
N/A
■ Paper Feeding
When paper passes the actuator (feed sensor part), it detects the signal of Photo interrupter, informs the
paper 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 display
Orange color).
■ Paper Exit Sensing
N/A
■ Cover Open Sensing
The 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 Driving
Clutches are driven by turning on TRs, which is controlled by CPU. The diode in the Clutch driving circuits
protects TR driven from the noise pulse, which is occurred when the solenoid is de-energized.
■ Motor Driving
The main motor driving circuits is on the main board
There is motor driver IC on the main board control the step motor.
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Service Manual
Samsung Electronics