3A7
2-3-4
CN2-1 CN1-15 V 5 V
CN1-2
PI1
PI1
CN1-3
PI2
PI2
CN1-4
PI3
PI3
CN1-5
PI4
PI4
CN1-6
PI5
PI5
CN1-7
GND
CN1-8
DFTSW
CN2-3GND
CN2-2DFTSW
2-3-2 Original size detection PCB
Figure 2-3-3 Original size detection circuit
The original size detection PCB (OSDPCB) consists of five transmission-type photointerrupters, the original set switch (PI5)
and original size width switches B to E (PI4 to PI1). It determines the presence of the original on the original table by the on/
off status of the original set switch (PI5) and the width of the original by the combination of the on/off status of original size
width switches B to E (PI4 to PI1), and then sends these detection signals to the DF driver PCB (DFDPCB).
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