No fire troubleshooting

No fire troubleshooting

This guide will help you identify and solve most problems with your laser machine not firing the laser beam.

Make sure your K40 turns on and homes to zero position.
If it doesn´t, check the fuse in the rear power connector before continuing.

Step 1

Turn on your machine.
Open the lid on your panel and push the test-button located on your power supply

This is good, your PSU and laser tube is healthy and working.

Go to Step 2

The most common problem when the machine is firing with low power, and mA-meter showing 2-5mA no matter what power setting is set – the flyback transformer is often the issue.
This part is avalible at ebay, aliexpress or in our store. Make sure to visually identify your type of rectifier before ordering one.

If you want to step your game up a bit – upgrading to a HY-T50 is a good upgrade, this PSU does not have the issues the K40 power supply has.
Avalible on amazon, ebay and aliexpress.

You have a issue with your PSU or laser tube.
The flyback transformer might be the issue but there is no guarantee it will solve your problems.
I suggest upgrading to a HY-T50 instead of buying a new K40 power supply (not sold by us).

This guide cannot identify exactly your problem any closer than this.

Things to try:
– Make sure you have grounded the machine properly – see this article
– Check all internal connections for breaks, bad crimps or loose cables.

Step 2

Turn on your machine.
Push the test-button on your panel, and/or through the software you are using with your machine.

Great – you don´t have a issue with your machine 😉

You probably have a issue with the protect function of the power supply.

Try this:
– Put a bridge or small cable between P+ and P-(gnd) and test the machine again. If it fires it´s whatever security solution connected to these pins that are your problem.
Often a flow sensor is connected, inspect it and sometimes it can be adjusted to allow for less flow/pressure.
You can also find flow sensors in our store.

If you have upgraded your controller:
Make sure the power supply, any extra 24V power supply and the controller is grounded to the same point, often the ground bolt in the back of the machine.
You can also put a small cable between the laser PSU ground to the screw terminal ground on the Cohesion3D controller.
Same solution with other controllers, make sure they are grounded on the same spot.

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Comments (5)

  • Richard Reply

    Thanks for this guide. When I test fire the laser both with the test button and the power supply test button there is a clicking but no laser. Do I need to replace both the tube and the power supply. Which would you suggest to do first? Seems a waste, is there anybody who recycles these?

    6 January, 2019 at 23:31
    • HP Persson Reply

      Without doing a high voltage test its a chance. The tubes doesn´t die quickly, they fade away in 9 of 10 faults with them. But the PSU often dies over a second. I would go with a PSU to start with, or only the flyback transformer.

      7 January, 2019 at 18:43
      • Richard Reply

        Thanks, I will do this. You mention elsewhere on this site the Hy t50 PSU..can this be used with the k40 or will it be ‘overpowered’? I have the digital readout – yet to install a mAmmeter.

        8 January, 2019 at 17:51
        • HP Persson Reply

          Hy-T50 will work good on the K40. Just keep a eye on the mA-meter not to over power the tube. I have changed to T50´s in all my machines, one even have a T80.

          8 January, 2019 at 23:17
          • Richard

            Ok, I have just ordered one, will let you know if it fixes my machine. Thanks

            9 January, 2019 at 17:26

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