Panasonic KX-FC379CX Service Manual page 168

8.5.1. Document Top SW (SW351)................."REMOVE DOCUMENT"
When a document is brought to the read position, the SW turns ON, and the input signal of IC301-16 pin (Operation) becomes a
low level. When there is no document at the read position, the SW turns OFF, and the input signal of IC301-16 pin (Operation)
becomes a high level.
Out of the Read Position
At the Read Position
8.5.2. Document Set Sensor (PS301)................."CHECK DOCUMENT"
When the document is set, the shelter plate shuts the sensor light, and the photo transistor becomes OFF. The input signal of
IC301-15 pin becomes a high level. Usually, the shelter plate is lifted, the photo transistor becomes ON, and the input signal of
IC301-15 pin becomes a low level.
No document
Set document
Operation Board
SW Signal (IC301-16 pin)
OFF
ON
Operation Board
Photo transistor Signal (IC301-15 pin)
ON
OFF
167
High level
Low level
Low level
High level
KX-FC379CX