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Circuit Description
5-5-2. Image Sensor
This shading wave is formed by scanning the white roller prior to a document. The slice level is determined by
the shading wave, and compensates for shading distortion according to the CIS characteristics. The wave
format from the CIS is converted into a 6 bit digital value in the SDIP4 image processor, and then processed in
B/W or intermediate mode.
5-5-3. CIS Driver
The CIS driver clock (CLK) frequency is 500
kHz. A low duty cycle of 75% is used to
lengthen the charging time. A start signal (SI) is
provided every 5 ms to match the line scanning
time. Actual image signal (VIN) is provided in
less than 3.4 ms, using the 500 kHz clock,
taking A4 paper size into consideration.
5-5-4. Sensor Detection Circuit
PE SENSOR 1,2
This sensor detects whether paper is loaded in the automatic sheet feeder. If no paper is detected, the output
signal turns high. While paper is feeding to print, the output turns low.
HOME DETECTION CIRCUIT
This circuit detects whether the head is in home position. When power turns on and head is capped, the circuit
is activated. If the head is in the home position, the output turns high.
5-5-5. Scan Motor Controller
The SF3000/SF3000T model facsimile machines perform their send function utilising a single 24 volt motor.
This motor has a winding resistance of 120 ohms. Three drive strobe pulses are used to operate the motor.
Motor Function
Document Feed In/Out
Fine Copy/Tx
Super Fine Tx
5-12
CLOCK
SI
SIG
Figure 5-9 CIS Diver Clock Timing
Drive Strobe Pulse
400 pps
400 pps
400 pps
500 KHZ (L:DUTY 75%)
1 LINE
Phase
1-2 phase
1-2 phase
1-2 phase
Samsung Electronics
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