Panasonic KX MC6020 - Color Laser - All-in-One Service Manual page 98

KX-MC6020HX
6.13.21. Optional OPF Paper Sensor
This sensor detects whether there are recording papers in the Optional paper tray or not.
When there are recording papers in the tray, a shelter plate closes the sensor light.
So the photo-transistor turns off and the input signal of IC300-J33pin becomes high level.
When there no recording papers in the tray, a shelter plate lets the sensor light pass.
So the photo-transistor turns on and the input signal of IC300-J33pin becomes low level.
6.13.22. Optional OPF Jam Sensor
This sensor detects whether the paper is at the OPF sensor position.
When the recording paper is detected, the shelter plate lets the sensor light pass.
So the photo-transistor turns on and the input signal of IC300-L32pin becomes low level.
When the recording paper is not detected, the shelter plate closes the sensor light.
So the photo-transistor turns off and the input signal of IC300-L32pin becomes high level.
Photo-transistor
Paper Exist OFF
No Paper ON
Photo-transistor
Paper Exist ON
No Paper OFF
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Signal (IC300-J33Pin)
High Level
Low Level
Signal (IC300-L32Pin)
Low Level
High Level