Panasonic KX-FT901CX-B Service Manual page 126

KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S
8.5.6. DOCUMENT TOP SW (SW44)
When a document is brought to the read position, the SW becomes ON, and the input signal of IC1-16 pin (Operation) becomes
a low level. When there is no document at the read position, the SW becomes OFF, and the input signal of IC1-16 pin (Operation)
becomes a high level.
8.5.7. DOCUMENT SET 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
IC1-15 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 IC1-15 pin (Operation) becomes a low level. (When checking this sensor, the
IC1-41 pin becomes a low level.)
Operation Board
Out of the Read Position
At the Read Position
Operation Board
Photo transistor
No document
Set document
Signal (IC1-16 pin)
High level
Low level
Signal (IC1-15 Pin)
ON Low level
OFF High level
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