Panasonic KX-FT63BX Service Manual page 121

6.5.4. JAM SENSOR (SW3)
The JAM sensor is a detection switch for determining whether the recording paper edge is in the correct position or not. If the
recording paper cannot be detected correctly at the JAM sensor position even when recording paper is present, then JAM is
displayed. If the recording paper is at the sensor position, then the switch turns on the CN1-11pin (Analog) switches to a high level.
6.5.5. DOCUMENT TOP SW (SW42)
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.
Analog Board
Signal (CN1-11 Pin)
Paper
No paper High level
Operation Board
Out of the Read Position
At the Read Position
121
Low level
Signal (IC1-16 pin)
High level
Low level
KX-FT63BX / KX-FT63BX-W