Product specification and featureService Manual 2-21Samsung ElectronicsDC FAN / SOLENOID DrivingIt is driven by transistor and controlled by D14(FAN MAIN), E16(FAN DUPLEX), C23(PICK-UP CLUTCH), C18(REGICLUTCH), D15(MPF CLUTCH) of CPU.When it is high, the fan is driving by turning on the TR, and it is off when the sleep mode is selected. There are threesolenoids, and they are driven by paper pick-up, regi and MPF signal. It is turned on or off by C23, C18, D15 of CPU. Thediode protects the driving TR from the noise pulse, which is flown when the solenoid id de-energizing.FAN Driving Circuit is driven by Transistor, and controlled by D14, E16 of CPU.Motor DrivingThe main motor driving circuits is on the BLDC Motor Ass y Unit. Main Controller has the interfacing circuits. There ismotor driver IC on the motor control board of Motor Ass y Unit.The exit motor driving circuits is formed when the driver IC is selected. The AN44060A Motor Driver IC is used in thiscase. The resistance Rs value for sensing and voltage value for the V reference can be changed by motor driving voltagevalue. The motor driving voltage is calculated with the following formula.The motor driving circuit is formed when the Driver IC is selected. The A3977 Motor Driver IC is used in this case. Theresistance Rs value for sensing and voltage value for the V reference can be changed by motor driving voltage value. Themotor driving voltage is calculated with the following formula.I = Vref / Rs, wherein Vref is (R1 5V) / (R1+R2).IN 0, 2 IN 1, 3 Output CurrentL L Vref / (10*Rs) = IoutH L Vref / (15*Rs) = Iout * 2/3L H Vref / (30*Rs) = Iout * 1/3H H 0
