schematic for 120vac to 12vdc pwr supplies

Discussion in 'General Electronics Chat' started by AESWind, May 25, 2010.

  1. AESWind

    Thread Starter New Member

    May 25, 2010
    3
    0
    I am having difficulties troubleshooting some 120vac to 12vdc pwr sups. These are industrial use components.

    My issue is that I have a number of them that drop the output from 12.5 down to 6 and some change when a load is applied. I have been unable to determine which SMD is at fault as they read identically to a known-good power supply
    when compared side by side and tested with either a DMM or a Huntron prober.

    I know they're not really expensive and can be replaced readily enough, but if I can get the gist of how and why they work and fail I can save myself and my company some significant cash and time.

    I am not trained to any depth on electrical/electronic theory, but I know my way around a DMM well enough, but, having not been able to locate a schematic or block diagram, I'm floundering a bit.

    These are International Power "B" case power supplies. (http://www.internationalpower.com/cases.html#b)

    Any assistance would be appreciated.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
    Hello,

    Do you have a manual of the powersupply or datasheet?
    Can you give us more details?
    Perhaps some closeup photos?

    Bertus
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Did you try writing to their technical support, and asking for a schematic of the model that you are working on?
     
  4. AESWind

    Thread Starter New Member

    May 25, 2010
    3
    0
    Regrettably, I have install instructions (various configs for various voltage in/out requirements) but nothing else. I have made inquiries with their tech dept; They were less than helpful, the attitude being more along the lines of if it doesn't work, put in a new one. An attitude I've discovered is prevalent with a significant number of electrical component manufacturers.

    I am not sure what more in the way of info you all would like; Do advise.

    I'll try to get some pics of it also.

    Thanks

    AESWind
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  5. AESWind

    Thread Starter New Member

    May 25, 2010
    3
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    Not sure what the stuff after my username is, sorry.
     
  6. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,770
    970
    The manufacturers give you that attitude because they are right (power supplies are cheap)... but without the part numbers it is hard to say if they are even broken
     
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