Samsung SCX-5530FN/XAZ Service Manual page 20

System Overview
3.1.2 Engine H/W
1) Sensor Input Circuit
- Paper Empty Sensing:
The Paper empty sensor (Photo Interruptor) on the HVPS informs the state of paper to CPU whether it is empty or
not with 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.
2) MP Sensing:
By operation of Actuator on the frame, MP Sensor (Photo interruptor) on the HVPS informs the state of paper to CPU
whether 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.
3) Paper Feeding Sensing:
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 (LCD will be displayed RED
color). 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 of toner cartridge is invalid, it will show invalid sign on a LCD and LED(LED will be displayed RED color).
4) Paper Exit Sensing:
It detects paper state whether paper gets out from the set with operation of exit sensor on the HVPS and actuator on
the frame. Paper detects the on/off time of exit sensor by reading D22 of CPU, and the normal operation or jam
information is informed to the CPU. The paper JAM2 is informed. (LED will be displayed RED color)
5) Cover Open Sensing:
The 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
operated by the D23 of CPU. In case, the red will be ON for informing the facts to user.
6) DC FAN / SOLENOID Driving:
It is driven by transistor and controlled by D14(FAN MAIN), E16(FAN DUPLEX), C23(PICK-UP CLUTCH), C18(REGI
CLUTCH), 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 three solenoids, and they are driven by paper pick-up, regi and MPF signal. It is
turned on or off by C23, C18, D15 of CPU. The diode 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.
7) Motor Driving:
The main motor driving circuits is on the BLDC Motor Ass'y Unit. Main Controller has the interfacing circuits.
There is motor 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 this case. The resistance Rs value for sensing and voltage value for the V
reference can be changed by motor driving voltage value.
Service Manual
3-2
Samsung Electronics