Lexmark OptraImage SC 1275 Service Manual - Page 29
Lexmark OptraImage SC 1275 Manual
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Paper Type Detection The overhead projection (OHP) sheet detect board (PWB-D2), consisting of an LED (LED1) and a photo sensor (PT1), determines whether transparencies or plain paper is being fed through the machine. When plain paper is feeding, the light from the LED reflects off the surface of the paper, and strikes PT1. 1-8
1-8
Paper Type Detection
The overhead projection (OHP) sheet detect board (PWB-D2), con-
sisting of an LED (LED1) and a photo sensor (PT1), determines
whether transparencies or plain paper is being fed through the
machine.
When plain paper is feeding, the light from the LED reflects off the
surface of the paper, and strikes PT1.