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  1. #1

    Join Date
    Jul 2020
    Posts
    2

    Laser won't turn off always on and no power control

    Hi community, so i bought an used cnc with laser for engraving, I have no information on the product, but i tried testing laser first using lasergrbl software. I tried to print a small stencil pick (10x10cm) but on the white spots of the pic the laser won't turn off, its always on and burning, it has 3 connector pin, gnd, 12v, pwm, i turn the button on the laser on, and it starts burning the wood.
    What am i doing wrong?
    Thank you

  2. #2
    Member
    Join Date
    Dec 2012
    Posts
    183

    Re: Laser won't turn off always on and no power control

    Hello.

    Have you considered that the laser driver might be damaged?

    When you first turn the laser on power is applied to the driver but then on a signal to the driver shuts the control element off or on according to the program.

    If the only way to turn the laser off is turning the machine off it´s quite likely the laser driver is shorted. Most probably a MOSFET is used as the control element and you will require to replace it. You may need a service technician to do it.

    I hope this helps.

    Regards.

  3. #3

    Join Date
    Jul 2020
    Posts
    2

    Re: Laser won't turn off always on and no power control

    How can I replace the board if the laser has no brand indication? can I plug any board?

  4. #4
    Member
    Join Date
    Dec 2012
    Posts
    183

    Re: Laser won't turn off always on and no power control

    Quote Originally Posted by jpnm24 View Post
    How can I replace the board if the laser has no brand indication? can I plug any board?
    Hello.

    As far as I know the driver and tube are "married" together. You may have to ask the tube manufacturer for replacements.

    Yet the option of having a service technician take a look at the driver might prove worth the time.

    Regards.

  5. #5
    Registered
    Join Date
    Apr 2010
    Posts
    28

    Re: Laser won't turn off always on and no power control

    Post pictures of your machine. Someone may be able to identify it and help you. Otherwise no one really can help you easily.
    www.picengrave.com

  6. #6
    Member
    Join Date
    Jul 2020
    Posts
    2

    Re: Laser won't turn off always on and no power control

    Quote Originally Posted by citrusguy View Post
    Post pictures of your machine. Someone may be able to identify it and help you. Otherwise no one really can help you easily.
    yeah please cause i have same problem

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