ac adapter k30290

Discussion in 'General Electronics Chat' started by cainrand, Jan 28, 2014.

  1. cainrand

    Thread Starter New Member

    Jan 28, 2014
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    I had found a thread on this forum regarding the ac adapter k30290 but it didn't have a resolution, so I am hoping I can get some help troubleshooting this component.

    It is out of a Canon printer which "died" along with many other electronics when lightening struck.

    Looks like I should have an output of at least 24V but the most I can get is 7.5V
    I am not super wise to this sort of repair, but I was hoping to find a burned TVS Diode or something obvious when I opened the case - I don't see anything.

    Could I get some suggestion or help in troubleshooting this?

    [​IMG]

    [​IMG]

    [​IMG]

    Thanks
     
  2. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    What are you using to measure this?
    What I am really asking is what test euqipment is available and can you use it?

    I can't see any obvious dmage on the component side, but IC1 on the track side could be damaged, or just blurred in the second photo.

    Can you systematically test each components with an ohmeter/continuity checker. The diodes are easily accessible.
     
  3. cainrand

    Thread Starter New Member

    Jan 28, 2014
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    Only thing I have is my seemingly outdated Fluke meter (used to be a Diesel Mechanic).
    [​IMG]

    The IC1 looks Ok under the microscope.
     
  4. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    Microscopes are all very well but your Fluke is more use.

    Go round all the two legged componenets you can D1, D2, D3, D4 D10?, L, R4 and test.

    The diodes should have high resistance in one direction and low in the other.

    L2 should look like a short circuit.

    If these components are OK, it will be worth delving further.
     
  5. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
    1,190
    156
    Whats wrong with a old fluke meter???
     
  6. cainrand

    Thread Starter New Member

    Jan 28, 2014
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    Not a thing! I love it, had it for 22 years now. :)

    I was looking for a pic from Fluke to show what I had, but couldn't find one.. seems this unit is obsolete and I just can't accept that. LOL
     
  7. cainrand

    Thread Starter New Member

    Jan 28, 2014
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    Not knowing exactly what I am doing or what is what and what should be doing what...
    I put the meter on Ω and check the two legged components, they all have a higher reading one way than they do the other, though some are not much different.
     
  8. KevinLuck

    New Member

    Apr 10, 2014
    1
    0
    Hi,
    I have exactly the same problem with my printer power supply dying (after a lightning strike) and so I'd really appreciate any information on what I should be looking for when testing the various components on a K30290 adapter board.
    Many thanks.
     
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