Tray Set Detection - Ricoh FT7770 Service Manual

Tray Set Detection

13.
When the tray is pulled out, the ground connection is broken, and the sig-
nal at CN203-A15 (CN203-B16) changes from O volts to a 7-volt pulse.
The CPU then turns off the paper size display.
When the tray is set, CN203-A15 (CN203-B16) goes from a 7-volt pulse to
o volts. The CPU then reads and displays the paper size and checks paper
volume.
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30 April, '89