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This section contains questions and answers for troubleshooting BoXZY's laser head.

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Laser Head Not Detected

My 3D print head suddenly stopped working (not heating, 26 degrees) and showing up as CNC head detected) so I put in the Laser head and gave it a go.

Initially it showed Laser Head detected, the fan came on and in alignment mode I could see the dot, but after about a minute, it shut down and now shows CNC head detected.

I can move the gantry in all 3 axis from the Alignment section, but no Laser light or fan comes on. I tested the cable from the head to control box with an ohmmeter and all wires check good.

Summary - cable checks good, but both the print head and Laser head indicate as CNC.

Any suggestions would be greatly appreciated

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1 Answer

Are all of the pins in the cable at the same height in the connectors? Sounds very much like a weak/lost connection in the sensing circuit. Both the laser detection and printer temperature reading use the same wires.

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Thanks for the suggestion. All the pins on the cable are the same height and I gauged them with a spare header pin to make sure the were making a good connection. The print head failure occurred in mid-print after several days of printing different parts which is why I initially thought it was a failure in the print head.

Do you know which wire is used? Perhaps there is a failure inside the control box.

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They go to the red and white wire, 2 pin. connector, mid board, right side.

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Thanks. As I understand from other postings, the controller looks at the resistance between these two wires to determine what is attached. If that is correct, can I safely short out the red and white wires to test if the controller ses it as a Laser Head?

I tested the continuity of the cable from the Laser head to the Utlimaker controller board and all lines check good so I've ordered a new AT-Mega board to see if that is the problem.

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Yes, you can safely do that.

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A Tale of Two Wires: After shorting out the Red and White wires the software log shows "Laser Head Detected" thus the problem is not with the controller or the wiring. Disassembly and inspection of the Laser Head did not reveal anything obvious, but I crimped a ring terminal on to the white ground wire for a better connection and that fixed the problem. Knowing that the problem was in the head, I opened the print head and after a through probing with an ohm meter discovered that the solder joint connecting the thermistor to the internal wiring harness on the print head had failed but was concealed by the heat shrink insulation. I resoldered the wire and now the print head is also detected. Independent failures in two different heads that resulted in the same error. Thanks for your help. Perhaps this thread will help others some day.

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Dan Fisher will be eternally grateful.
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