Panasonic KX-FPC135 Service Manual page 178

KX-FPC135 / KX-FPC141
3. [Cover Open Sensor (PS303)]
When the operation panel cover is closed, the shelter plate is lifted, the phototransistor becomes ON, and the input signal of
IC301-20 pin (Operation) becomes a low level. When the cover is opened, the shelter plate shuts the sensor light, the
phototransistor becomes OFF, and the input signal of IC301-20 pin (Operation) becomes a high level.
4. [Paper top Sensor (PS502)]
When the recording paper is loaded on the print head, the shelter plate shuts the sensor light, and the phototransistor becomes
OFF. The input signal of IC501-152 pin becomes a high level. Usually, the shelter plate is lifted, the phototransistor becomes
ON, and the input signal of IC501-152 pin becomes a low level.
Operation Board
Phototransistor
Open
Closed
Phototransistor
Set recording paper
No recording paper
Signal (IC301-20 pin)
OFF High level
ON Low level
Signal (IC501-152 pin)
OFF High level
ON Low level
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