Im having an issue with an electronic detector on one of my printing presses and wanted to see if I could get a little troubleshooting help. No diagram unfortunately. My technician wants to get new sensors which it may need but i want to make sure theyre getting power. The new parts are about $750 and are in Japan. I dont want to buy them if theyre not needed, plus weeks of potentially wasted downtime. I dont know how to test them. Their function is to send and receive a beam through a sheet of paper as it passes between the sensor. It detects a double sheet by means of the expected density, presumably as a function of voltage. Once it has detected a sheet it sends its signal to the circuit board which will then determine pass/fail. It then sends the info downstream to other parts of the press for other timing and mechanical purposes. Without this information, the press will not function at all.20161229_101533.jpg
The 3-wire cable is for the sender (lower) and the 2-wire goes to the receiver (upper).
The receiver mount has been cracked for some time but broke when i took it apart. The receiver is still sealed and wires are intact.
If ive been too vague or mre info is needed, please let me know.