Detectors - Star Micronics TSP200 Series Technical Manual

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.
IC1
CPU
P45
2 Paper-Near-End Detector
The near-end detector is mounted in the paper-roll holder.
IC1
CPU
P47
+5V
+5V
–
+
Fig. 2-18 Paper-Out Detector
CN3
+5V 2
+5V
1
3
Fig. 2-19 Paper-Near-End Detector
CN2
4
5
+5V
3
– 24 –
Paper
Photosensor
Paper-roll