Laser PSU... I think?

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    Badcaps Veteran
    • Apr 2007
    • 721
    • USA
    #1

    Laser PSU... I think?

    I took a look at this for a friend. It looks like someone replaced the iron, and then noticed the bad transistor and stopped because the green and white primaries? were never hooked back up.

    Obviously, this thing was built some time ago. Coherent Radiation hasn't been called such since '77, and this transformer is labeled as such so it pre-dates the transition to the Coherent only name. Should I leave the rest of these components alone or update them? I don't even recognize those large, faded orange discs, which by labeling appear to be resistors?, and those black jobbers labeled MH5+. I have replacement transistors for the 2N5086, but I have no idea what caused it to blow up in the first place.

    I'm told it's supposed to power a hand-held laser.
    Attached Files
    Presonus Audiobox USB, Schiit Magni 3, Sony MDR-V700
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Laser PSU... I think?

      500M 6KV Z5U = 500 = 500pF, M = +/-20%, 6KV, Z5U dielectric.
      That section where the capacitor and the rectifier diodes (MH5) are for the Voltage Multiplier circuit (https://www.allaboutcircuits.com/tex...e-multipliers/)
      You should be able to able to draw the circuit of that board since it is only single sided board and not many parts on it.
      Is this He-Neon LASER?
      Are there any prints on the power supply box?
      https://www.ebay.com/itm/Coherent-Ra.../253415517802?
      Last edited by budm; 05-16-2020, 11:25 PM.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

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