Panasonic KX-FB423CN Manual page 353

KX-FB423CN
7.6.6. COVER OPEN SWITCH...."COVER OPEN"
The Switches detect whether the printer cover is open or closed.
When the printer cover is closed, the switches turn ON, and the input signal of IC505-94 pin becomes a high level.
When the printer cover is open, the switches turns OFF, and the input signal of IC505-94 pin becomes a low level.
7.6.7. PAPER TOP SENSOR...."PAPER JAMMED"
The sensor detects whether the recording paper set or exit out or not.
When there is no recording paper at the position of the sensor, the shelter plate closes the sensor light, the photo-transistor OFF,
and the input signal of IC501-19 pin becomes high level.
When the recording paper reach the paper top sensor, the shelter plate let the sensor light passing through, the photo-transistor
ON, and the input signal of IC501-19 pin becomes a low level.
[Paper Top Sensor]
Switch
Open
Close
Photo-transistor
No paper
Paper Exist
Signal (IC505-94 pin)
OFF High level
ON Low level
Signal (IC501-19 pin)
OFF High level
ON Low level
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