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Thread: RGB Lasers - faulty dual blue laser module.

  1. #1
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    Default RGB Lasers - faulty dual blue laser module.

    Hi, Iím slowly working through the issues with my RGB Lasers LP2000 projector.

    The Blue laser is a strange looking module which has 2 laser beam aperures.
    Looks like the 2 beams are combined using a PBS cube. However it looks like only 1 side of the module is working.
    I have no technical information on the module & Iím keen to check that itís getting its correct power rails & modulation signals.
    Does anyone have any ideas? Thereís a D plug but I have no idea of the pinout. Could it be one half is misaligned somehow? There does seem to be more PSUs than laser modules!
    unfortunately RGB Lasers cannot find the circuit diagrams.
    Any help would be greatly appreciated,

    Si Bond in UK.
    Click image for larger version. 

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  2. #2
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    Is the blue made up of 2 different wavelengths? Could one be a 473 module and the other 445?
    If the one that is out is 473 then you're into a lot of pain for not much gain. The pump diode might have gone, or the crystal may have absorbed moisture, etc.
    Given that it's only about 1W of blue in there (assuming the 2000 relates to total power) I'd just look for a new module to drop in there.

    If you want to check obvious things, find the driver and if its a sealed unit, pop the lid off and look at the board. The outputs are usually marked on the board for diode drive, etc and you can measure them there.

    I've got a small pile of modules at home that it simply wasn't worth the time investigating and fixing, especially not where DPSS were concerned.
    http://www.facebook.com/SubsonicSystems
    http://www.frikkinlazors.co.uk

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

    I thought it fitting, considering the rocky terrain.

  3. #3
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    I know those modules. That are 2x 473nm dpss blues of 1W each combined. Marvelous colours.
    But he drivers suck. Probable one of the drivers broke. How many sub-d connectors are there on the dual blue?
    Usually there are 2. If so you can switch the sub d's and see if the other laser starts to lase.
    If that is the case, then it might be one of the power supplies that is gone.
    These projectors usually have 2 power supplies per head. And I found them to brake from time to time. (assuming the power supplies are those open frame power supplies)
    Last edited by jeejeedr; 11-28-2018 at 21:35. Reason: typo

  4. #4
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    Default faulty blues in an RGB LP2000.

    Thanks for the advice. I also need to take better photos & get the serial number.
    but I will try both - swapping the D plugs over to see if itís a faulty driver. Also take the lid off tocheck board connections. Is it ok to open the modules? Theyíre not sealed units where a speck of dust would cause damage?
    Also there are at least 4 or 5 driver circuit boards on righthand side. All look the same.

    i just wish I could get the circuit/schematic diagrams, or at least the pi outs..

    thanks, Si.

  5. #5
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    Default RGB LP2000 Dual Blue Laser module.

    Hi again,
    i forgot to post a picture of the Ďnest of driversí to the right.
    not sure what the loose purple wires are, but each driver has them.
    does anyone recognise the drivers?
    thanks, Si B in the UK.Click image for larger version. 

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  6. #6
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    The blue dpss crystals are hygrostatic. So if you can fugure out what is wrong without opening them, the better.

  7. #7
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    Quote Originally Posted by jeejeedr
    That are 2x 473nm dpss blues of 1W each combined
    Blimey! Must have cost a small fortune when new!! If its got 2W of 473, what does the 2000 in the model name represent?
    Or do you mean 2x500mW modules for a combined 1W of 473?


    Quote Originally Posted by jeejeedr
    The blue dpss crystals are hygrostatic
    Think you mean hygroscopic
    http://www.facebook.com/SubsonicSystems
    http://www.frikkinlazors.co.uk

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

    I thought it fitting, considering the rocky terrain.

  8. #8
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    Default RGB Lasers - faulty dual blue laser module.

    Click image for larger version. 

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    Thanks for your replies. The dual module has a single D-Plug (which Iíve tried to capture in the photo above). So I cannot swap conneters over (as suggested by deedeedr). But I can vary the blue level potentiometer on the back & use my oscilloscope to see which pin controls the blue modulation. I can also check power rails.
    Are the drivers familiar to anyone? Thereís quite a few there. Loose purple wires are not used.
    next logical step would be checking that the drivers are sending the correct signal to the blue laser modules. These are constant current devices, of a sort, arnít they? Iím reluctant to just start poking about as Iím aware they are very succeptable to Static damage, so thought Iíd ask first. Lasorb module maybe.
    Click image for larger version. 

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    The manufacturers spec. says the blue is 500mW at 473nm.

    Does anyone have any suggestions as to what to do next?

    Thank you all very much; I didnít realise so many other people have the same hobby as me!

    😃 Si Bond in UK.

  9. #9
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    473nm lasers are usually DPSS, so it's a bit more complicated than a constant current drive. There will be the diode drive, drive for 1 or 2 Peltier modules and 1 or 2 thermocouples.

  10. #10
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    Quote Originally Posted by norty303 View Post
    Think you mean hygroscopic
    I think hygrostatic even doesn't exist

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