Panasonic KX-FT71LA-B Service Manual page 145

Out of the Read
Position
At the Read Position
5.5.4. DOCUMENT SENSOR (PS1)
When a document is set, the shelter plate closes the sensor light, the photo transistor becomes
OFF, and the input signal of the CN2-5 pin (Operation) becomes a high level. When there is no
document, the shelter plate passes the sensor light, the photo transistor becomes ON, and the
input signal of the CN2-5 pin (Operation) becomes a low level. / (When checking this sensor,
the CN1-8 pin, 3pin becomes a low level.)
Operation Board
Photo transistor
OFF
ON
Signal (CN2-5
Pin)
High level
Low level
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