Panasonic KX-FT981LA-B Service Manual page 28

KX-FT981LA-B / KX-FT987LA-B
6.5.4. Hook Sensor (SW102)
When the handset is lifted, the switch turns ON, and the signal at pin 43 of IC1 becomes low.
When the handset is returned, the switch turns OFF, and the signal at pin 43 of IC1 becomes high.
ON-Hook
OFF-Hook
6.5.5. Jam Sensor (SW103)
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 dis-
played. If the recording paper is at the sensor position, then the switch turns on the IC1-21 pin switches to a high level.
Sensor SW
OFF
ON
Signal (IC1-21 pin)
Paper Low level
No paper High level
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Signal (IC1-43 pin)
High level
Low level