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Thread: Urgent - strange DT40 issue

  1. #1
    Join Date
    Dec 2006
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    Essex, UK
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    Default Urgent - strange DT40 issue

    so got a projector and ive got a really really strange issue I cannot get my head around

    heres the issue, after about 2mins of running normally the dt40's do this



    on the projector you have ilda coming into robs ilda safety board, then into robs XY flip and then into the galvo amps.
    pin 25 is connect to the galvo amps and to the earth of the projector.

    all wiring has been checked and cant find any issue and like I say the projector runs perfect for about 2 mins then this
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  2. #2
    Join Date
    Nov 2005
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    Melbourne, Australia
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    Are you sure your not thrashing those scanners? It would appear that the polyswitch is going open to try to save the scanner.. Looks like the X scanner is the one with troubles.
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  3. #3
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    Jul 2008
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  4. #4
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    Default

    only normal settings dave

    thanks will look at that link
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  5. #5
    Join Date
    Aug 2010
    Location
    Hungary
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    Default

    Mine had the same issue.
    One of the connectors causes this.
    You should set a bit of motion on them or clean their contact pins.
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  6. #6
    Join Date
    Aug 2013
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    West Sussex
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    Default

    Any luck yet?

    I noticed there is a lot of jumping of the galvos before it goes really crazy which looks like a PSU problem.

  7. #7
    Join Date
    Jul 2009
    Location
    Wollongong
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    78

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    I had the same issue. Had 3 heads all DT-40 pros. All set to the same scan angle and speed all running off the same QM. But one head spazzed out.

    Checked wiring and its good. Ended up pulling the projector apart (to replace the green), iam rebuilding it now.

  8. #8
    Join Date
    Jul 2010
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    That scanner is freaking out. I would not leave that scanning for too long.
    Did you measure temperature with an IR thermometer of both amp and scanset?

  9. #9
    Join Date
    Feb 2011
    Location
    Knutsford, UK
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    286

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    Andy, check the heatsinking on the scanner AMP to make sure its a decent temperature and not too hot. If it's genuinely cool bypass the yellow polyswitch fuse on the AMP as a test.

  10. #10
    Join Date
    Dec 2006
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    thanks for the suggestion guys

    someone who owns these scanners told me they worked perfect, when actually the issue has been happening for a long time. so ive given the scanners back and said good luck...

    originally i thought id done something to them.
    Last edited by andy_con; 02-25-2014 at 14:10.
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    Aluminium Optic Mounts

    http://www.laser-man.co.uk/opticmounts/

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