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Thread: Problem with DT40 scanners

  1. #1
    Join Date
    Aug 2011
    Posts
    4

    Default Problem with DT40 scanners

    Hi everyone,

    I have some problems with 2 sets of DT40 scanners.
    We buyd them new in 2 projectors (2 watt compact green by RGBlasersystem.com, with DT40 scanners).

    Both sets are working allright for 2 minutes, after that the projection is gone.

    The size of the zone in pangolin is small ( 25 x 25)
    The scanrate is not more then 15.000 PPS

    Both DT40 sets are having problems.

    We tried different QM2000 boards, without succes.

    We think it is a problem with the heat of the drivers.


    Who can help?


    Martin Gorter
    INTERVISUAL
    Netherlands

    martin@intervisual.nl

  2. #2
    Join Date
    Feb 2008
    Location
    East Sussex, England
    Posts
    5,246

    Default

    I would think that it would be extremely unlikely for both sets to switch off at exactly the same time due to heat. When you say the projection is gone, do you mean it dissappears, or it reduces to just a spot?
    If it dissappears then it suggests the whole signal is being lost (lasers switch off too), otherwise if you just get a dot then it means just the X/Y signal is being lost.
    At the point it stops projecting, are you getting any signal at all from the DAC?
    Frikkin Lasers
    http://www.frikkinlasers.co.uk

    You are using Bonetti's defense against me, ah?

    I thought it fitting, considering the rocky terrain.

  3. #3
    Join Date
    Sep 2006
    Location
    Netherlands
    Posts
    1,425

    Default

    Hi Martin,
    Welcome to the forums.

    If you purchased the projectors recently, contact your supplier first.

    How do you mean, projection is gone ?
    As in : One axis stops, then another ?
    Is the problem self-resetting ?
    Do the projectors have some sort of scan-fail ?

    Does the dropout occur sooner if you scan faster and wider ?

    RGBlasersystem is known for their high build quality, I assume they know how to mount these scanner amps.

    The problem could be located in the suppl(y/ies) of the scanner amps too.

  4. #4
    Join Date
    Aug 2011
    Posts
    4

    Default

    Hi Norty303 and thank you for your quick respond.

    Both sets don't stop at the same time, one set is failing after 2 minutes, the other after 5m minutes.

    The projection is not gone, it is just one big mess, i can see the scanners are trying to project what I want...

    During the failure I connected the DB25 connector into another laser with CT6800 scanners and the projection is perfect.
    We tried several QM2000 boards, there is no problem with the computer or the QM2000 boards.

  5. #5
    Join Date
    Aug 2011
    Posts
    4

    Default

    Hi Bart,

    We used the lasers for one year now, we know that we have to be carefull with the scanrate (always 15.000pps or lower).
    And the Zone we make in pangolin is not bigger than 25x25 (very small).

    The projection is not gone, it is one big mess, the scanners try to project but they can't.

    They have worked good for one year, so I think the design is gooed, and we are very happy with the projectors.
    5 minutes ago I sended an e-mail to RGB Lasersystem Hungary.

  6. #6
    Join Date
    Apr 2008
    Location
    Amsterdam, NL
    Posts
    2,098

    Default

    replace the ILDA cable

  7. #7
    Join Date
    Aug 2011
    Posts
    4

    Default

    Al geprobeerd...

  8. #8
    Join Date
    Apr 2010
    Location
    Grand Rapids, Mi
    Posts
    2,495

    Default

    If they are daisy chained, if one fails the other may back feed the other garbage. Try them independently to narrow down the issue
    leading in trailing technology

  9. #9
    Join Date
    Jul 2009
    Location
    The Netherlands
    Posts
    1,470

    Default

    Hey Martin, Welcome @ the PL forums.
    Did you measure the powersupplies output going to to the drivers ?
    And what does it do when it shuts off (maybe the supplies drop).

    It's strange that 2 sets are behaving like this, right ?

    Did you check for earth problems ?

    My green (the one i bought from you) i had placed in a projector and then had some issues.
    Rob advised me to take the earth out of the scanners.
    I recently put a blue in and had problems, now i connected the earth and low and behold: problem gone.
    So maybe something is wrong with earthing or powersupply ?

    Kind regards,
    Dimitri
    I didn't fail !
    I just found out 10,000 ways that didn't work.

  10. #10
    Join Date
    Jul 2006
    Location
    Connecticut, USA
    Posts
    2,478

    Default

    This is pretty typical of the DT systems.

    1) the P.S. is no wheres near powerful enough current wise to supply constant clean, power to scanning. Even at relatively lower scan angles and not even working the scanners hard. The P.S. are only i think 1-1.5A. NOT enough! What you see (the projections going crazy) is most likely the P.S. freaking out.

    2) The amps get VERY hot, VERY quick. Make sure you heat sink them very well and if possible, fan cool them also.

    -Marc
    http://www.laserist.org/images/ildalogos/ILDA-logo_colored-beams_Corporate_150w.jpg

    ILDA- U.S. Laser Regulatory Committee

    Authorized Dealer for:

    • Pangolin Laser Software and Hardware
    • KVANT Laser Modules & Laser Systems
    • X-Laser USA
    • CNI Lasers
    • Cambridge Technology & Eye Magic Professional Scanning Systems

    FDA/CDRH Certified Professional LuminanceRGB Laser Light Show Systems


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