Yamaha EM-150 (Trimmer Value Needed)

Discussion in 'Electronics Resources' started by oidium45, Sep 21, 2014.

  1. oidium45

    Thread Starter Active Member

    Apr 24, 2010
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    Hello everyone. I fried a trimmer on my yamaha EM-150. The side says 620E-220(ohm)B.
    I am trying to figure out what would be a good wattage rating for a replacement. I have included a photograph of the schematic for this part of the circuit.

    Thanks in advance!
     
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  2. bertus

    Administrator

    Apr 5, 2008
    15,647
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    Hello,

    Do you have a photo of the trimmer (with a scale next to it)?
    On the size we could estimate its power.

    Bertus
     
  3. MrChips

    Moderator

    Oct 2, 2009
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    According to the circuit schematic, the trimmer labelled B220 should be about 0.25W. If it is burnt then try replacing with 0.5W or 1W, 220-ohm trimpot.
     
  4. oidium45

    Thread Starter Active Member

    Apr 24, 2010
    130
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    Thank you MrChips! Would you be willing to share the schematic? I wouldnt mind looking it over just for kicks.
     
  5. MrChips

    Moderator

    Oct 2, 2009
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    What schematic? I am going by the schematic posted on your opening post #1.
     
  6. oidium45

    Thread Starter Active Member

    Apr 24, 2010
    130
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    Thank you MrChips! Would you be willing to share the schematic? I wouldnt mind looking it over just for kicks
    Oh, gotcha. I thought maybe you had the full schematic.
    Thanks for the help though!

    I was considering 1/2w but was a bit uncomfortable about it. Always comforting to get a second opinion.
     
  7. MrChips

    Moderator

    Oct 2, 2009
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  8. oidium45

    Thread Starter Active Member

    Apr 24, 2010
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