SOURCE: ERROR CODE E340 BLINKS WHEN MY COPIER ON
clean sensor beside drum then switch on machine with white paper on glass.
SOURCE: Panasonic DP3510 copier error code
This error is for the copy density sensor. Remove drum unit, 1 screw, and you will see the sensor inside of the machine. Either dropping toner out of the drum unit or machine is overtoned. I would recommend a service call from a technician for this problem.
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