Help!!. I need to identfiy a resistor

Discussion in 'The Projects Forum' started by Twincamman01, Jun 27, 2018.

  1. Twincamman01

    Thread Starter New Member

    Jun 27, 2018
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    I need to replace this resistor.(r24) there are no colors on it. It is on a board inside a garage door opener. It runs the safety beam. Any help.. Thanks..
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    Make and model of unit?
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
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    That is a high wattage wire wound, you will have to measure the metal conductor each side of any break.
    They are available but not exactly in that format, maybe
    Max.
     
  4. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    And you will need to find and replace whatever caused the resistor to release its smoke.
     
  5. Twincamman01

    Thread Starter New Member

    Jun 27, 2018
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    Miracle Industries Inc. Very old unit..
     
  6. Twincamman01

    Thread Starter New Member

    Jun 27, 2018
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    I hit the resistor and snaped it when replacing the light bulb...
     
  7. MrChips

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    Oct 2, 2009
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    The resistor was already cooked before you snapped it.
    Can you post a photo of the back side of the circuit board?
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Fortunately its not carbon so should be easy to measure with any oxide surface cleaned first.
    Max.
     
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  9. Twincamman01

    Thread Starter New Member

    Jun 27, 2018
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    Will do later tonight. At work.. thanks. It was working before i snaped it. Garage door was operating.
     
  10. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
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    I am completely convinced it is wirewound. It could be a film resistor as they also have a spiral element.
    https://en.wikipedia.org/wiki/Resistor#Foil_resistor
    [​IMG]
    Carbon film resistor with exposed carbon spiral (Tesla TR-212 1 kΩ)
     
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  11. Twincamman01

    Thread Starter New Member

    Jun 27, 2018
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  12. KJ6EAD

    Senior Member

    Apr 30, 2011
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    I don't see a break in the spiral so probably one of the end cap connections to the spiral was opened. If so, you should be able to measure the full value from end to end with a little wiggle on the loose end.

    I'm not sure what that string is there for but resistors of that type make poor accessory hangers. ;)
     
  13. MrChips

    Moderator

    Oct 2, 2009
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    Simple. The string is the TS' clever way of pointing to the component in question.:D
     
  14. Twincamman01

    Thread Starter New Member

    Jun 27, 2018
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    Any idea where I could buy one to get my garage door working?? Or real easy directions on how to measure said resistor? And then what to ask for when ordering.. Sorry to be a pain in the a%# but I know nothing about these part.
     
  15. MaxHeadRoom

    Expert

    Jul 18, 2013
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    If you can't get the exact replacement type, I would attempt to measure it, most likely very low Ohms, and look for a 10watt wire wound at Digikey etc.
    Max.
     
  16. KJ6EAD

    Senior Member

    Apr 30, 2011
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    You need to buy or borrow a multimeter to measure the resistance. Places like Harbor Freight have very inexpensive ones. Make sure the power is disconnected then follow the meter instructions to set up the meter. There are tutorials online that show you how to measure the value of a resistor. In your particular case you'll have to wiggle the end caps of the resistor with the meter probes to get a reading. You're also going to need to be able to unsolder the old resistor and solder the replacement in. Let us know how the measurement goes.
     
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