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PRINCIPLES OF OPERATION
3-3. Detectors
1 Paper-Out Detector
The paper-out detector (reflective photosensor) is located at the paper entry slit. The photosensor’s phototransistor
remains ON while paper is present. It goes OFF when paper runs out, generating output of a paper-out signal.
Fig. 2-18 Paper-Out Detector
2 Paper-Near-End Detector
The near-end detector is mounted in the paper-roll holder.
Fig. 2-19 Paper-Near-End Detector
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CN2
P45
+5V
+5V
+5V
4
IC1
CPU
Photosensor
Paper
5
3
P47
IC1
CPU
CN3
+5V
+5V
2
Paper-roll
3
1