Can you identify this component?

Discussion in 'General Electronics Chat' started by stupid48, Feb 17, 2014.

  1. stupid48

    Thread Starter New Member

    Feb 17, 2014
    2
    0
    Hi there...Newbie here...

    I've got a Panasonic RA-6600 receiver I'm working on. I think I've identified a blown component but I can identify what it is. I've posted a picture here. The leads are cut off of course. It is marked "IR7K" on the outside. Any help wpuld be greatly appreciated...

    Thanks, Chris
     
  2. inwo

    Well-Known Member

    Nov 7, 2013
    2,433
    315
    Looks a diode.
     
    Last edited: Feb 17, 2014
  3. #12

    Expert

    Nov 30, 2010
    16,321
    6,818
    Old tantalum capacitors had that curved shape on one end...and a polarity stripe.
     
  4. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    I would guess a diode. I have some bullet shaped diodes. Are there three others very close to where this one was located on the board?
     
  5. Metalmann

    Active Member

    Dec 8, 2012
    700
    223
    I'd say diode, but aren't those resistor markings?:confused:
     
  6. spinnaker

    AAC Fanatic!

    Oct 29, 2009
    4,887
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    That would be my vote.

    IR7K does not seem to come up with anything on a search.
     
  7. spinnaker

    AAC Fanatic!

    Oct 29, 2009
    4,887
    1,015
  8. inwo

    Well-Known Member

    Nov 7, 2013
    2,433
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    Guess I should ask.
    If it's unidentified, how do you know it's bad?
    Is that a cut off lead on the top?
     
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,553
    2,375
    Also the gauge of the wire points to a diode of some kind, acts as a heats sink.
    IR could be International Rectifier origin?
    Max.
     
  10. stupid48

    Thread Starter New Member

    Feb 17, 2014
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    0
    It showed some scorching underneath it so I'm going to assume it's bad.

    @GopherT...Yes there are actually three others right near it....
     
  11. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    Any markings on the board next to the three others?

    What about on the other side of the board?
    For example, I have a power board of my lcd monitor out, the top side has the components, the bottom side has diode symbol where diodes are on the top side.
     
  12. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Then it is a diode - 4 single diodes to make a bridge rectifier.

    You can go and track down some diodes that meet the power requirements or you can buy a single bridge rectifier that can be used in place of the four diodes. They are available at RadioShack. Getting one that is oversized is usually not a problem. You will have two wires coming in from the transformer - connect those to the AC sine wave symbols. Then you will have two wires going to the two big capacitors the two caps are connected to each other and each has one leg connected to the diodes. Look for a stripe on one capacitor with - - - symbols. This goes to the (-) of the bridge rectifier. The last leg of the bridge rectifier connects to the other capacitor.

    I hope that was clear.
     
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