Canon Paper Deck-V1, Service Manual

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Chapter 2
2-10
2.3.3 Detecting the Level of Paper
0009-2053
3. Detecting the Level of Paper in the Deck
The deck uses the deck paper supply position sensor (PS107), deck paper level sensor (PS108), and deck paper
sensor (PS102) to check the level of paper inside its compartment; the result of the check is indicated on the host
machine' s control panel. The following table shows how a check is made with reference to the states of the sensors:
T-2-1
1: the light-blocking plate is over the sensor.
0: the light-blocking plate is not over the sensor.
paper level PS102 PS107 PS108
100% to about
50% 1 1 1
about 50% to
about 10%
1
1 0
less than 10% 1 0 0
no paper 0 0 0