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Help IDing colors on part

Discussion in 'Electronic Design' started by amdx, May 22, 2011.

  1. amdx

    amdx Guest

    Hi guys,
    I need some help enlarging this picture of a circuit board to ID the
    resistor running horizontal,
    just to the left of the indexing hole of the big IC. (labeled R2)
    http://www.easyapplianceparts.com/PartInfo.aspx?inventory=1957099
    I have tried using MS Paint to enlarge but pixilation makes it unreadable.
    I'm hoping some has a magic program or even a large monitor that they can
    use to read the colors.
    I need the color code to replace the burned resistor.

    Thank you, Mikek

    The back story;
    My wife smelled something in the dryer room last Saturday, we traced it
    to the dryer.
    It was a burning electronic odor, I located the PCB and found two oozing
    capacitors, four bad
    diodes two bad 8.2 volt zeners plus the unknown resistor. I have replaced
    all but the resistor.
    If I get the value I'll replace the resistor and hope the 68HC705
    microcontroller is still good.
    If replacing the resistor does not fix it, then it's about $70 for the PCB
    or an new dryer.
    Or maybe I can make it work and not have a dryness control setting, I don't
    use it anyway.
     
  2. Tom Biasi

    Tom Biasi Guest

    "amdx" wrote in message
    Hi guys,
    I need some help enlarging this picture of a circuit board to ID the
    resistor running horizontal,
    just to the left of the indexing hole of the big IC. (labeled R2)
    http://www.easyapplianceparts.com/PartInfo.aspx?inventory=1957099
    I have tried using MS Paint to enlarge but pixilation makes it unreadable.
    I'm hoping some has a magic program or even a large monitor that they can
    use to read the colors.
    I need the color code to replace the burned resistor.

    Thank you, Mikek

    The back story;
    My wife smelled something in the dryer room last Saturday, we traced it
    to the dryer.
    It was a burning electronic odor, I located the PCB and found two oozing
    capacitors, four bad
    diodes two bad 8.2 volt zeners plus the unknown resistor. I have replaced
    all but the resistor.
    If I get the value I'll replace the resistor and hope the 68HC705
    microcontroller is still good.
    If replacing the resistor does not fix it, then it's about $70 for the PCB
    or an new dryer.
    Or maybe I can make it work and not have a dryness control setting, I don't
    use it anyway.

    Its not like on CSI, if there is no data there you can't get it. Even with
    my poor eyes it looks like 4.7 K (maybe).
    More importantly, what fried the supply in the first place.

    BTW: By today's standards that's not a bad price for the PCB.

    Tom
     
  3. Phil Allison

    Phil Allison Guest

    "amdx"

    ** What a BIZARRE question !!!!!!!!!!!

    The OP has the damn board so how come so he cannot use a magnifier on it ??

    If the resistor's colours are still readable, then it is not likely to be
    burnt out or even far off value - being a little scorched means nothing to
    a film resistor.

    The OP can measure its value easily enough too and has not done so.

    WTF ???

    Disclaimer:

    I know there are resistors that fail and yet look perfect, fusibles for
    example.


    .... Phil
     
  4. It's a 4.7K. See:
    http://www.partsdr.com/Parts/Electronic-Control-Board-338.cfm

    For $35, why not just replace it?



    Best regards,
    Spehro Pefhany
     
  5. P.S. Have you attempted to determine _why_ those relatively unstressed
    parts failed??

    For example, have you checked C3 to see if it's shorted?

    If the zeners failed open or the electrolytics were oozing, chances
    are really rather good the whole thing is toast anyway.



    Best regards,
    Spehro Pefhany
     
  6. amdx

    amdx Guest

    Good find on the price Sphero, Best I found was $60 not including shipping
    costs.

    Oh man, I just I just clicked to enlarge, that is a great picture clearly
    readable colors.

    Thanks, Mikek
     
  7. amdx

    amdx Guest

    Pay no attention to the man behind the curtain. :)
    Mikek
    Oh, ok Phil I'll give you a response (tough decision though)
    The resistor has been very hot, the pcb is charred. The colors look like
    Brown, Brown, Grey and Gold it measures 3.9K.
    What value is the resistor supposed to be?
    No cheating, don't look at answers given by people trying help.
    BTW, why does this piss you off?
    If it doesn't interest you, why can't you just ignore it?
     
  8. Phil Allison

    Phil Allison Guest

    "amdx"

    ** **** you - you arrogant prick.


    ** What was all that NOT in your post ???????

    Shithead.


    ** Stupid questions are always a piss me off on usenet.

    And YOU are an expert at them.


    ..... Phil
     
  9. amdx

    amdx Guest



    What part of "I need the color code to replace the burned resistor."
    don't you understand?
    Now control yourself, don't get pissed. Take your time, pick out some
    especially
    nasty, vile words to call me. Please don't recycle the usuals, they have
    become so
    old and boring.
    Thanks, Mikek :)
     
  10. Phil Allison

    Phil Allison Guest

    "amdx"
    ** What arrogant drivel.

    Obviously you are severely mentally retarded.

    I see you are another fuckwit radio ham - so that goes without saying.

    There was a guy on "aus.electronics" who used the handle "amdx".

    He was a complete imbecile too.



    ..... Phil
     
  11. Grant

    Grant Guest

    470R
     
  12. Grant

    Grant Guest

    I see multiplier as brown here, not red. Op should at least trace the
    connections to that resistor and calculate whether 4k7 better fits the
    circuit, postulate a failure theory and check all likely components.

    If OP values their time, $70 may be cheap for a replacement card.
     
  13. Phil Allison

    Phil Allison Guest

  14. amdx

    amdx Guest

    My complements on yourself control.
    A pat on the back for you Phil.
    Mikek
     
  15. amdx

    amdx Guest

    In Photoshop, averaging the pixel data after maxing the Chroma channel
    yields the following results:

    ffff63 (hex) = Yellow
    bd35c1 (hex) = Violet
    e02d55 (hex) = Red

    So, 4.7 kOhm

    BTW - Did you know that the CTRL+ and CTRL- keys will zoom you in or
    out (respectively) if using Microsoft Explorer.
    Ver-8 does anyway, but I think most versions have this feature.

    Good luck with the dryer!
    -mpm

    Just in case you and others missed it, Sphero found a great picture of the
    PCB.
    http://www.partsdr.com/Parts/Electronic-Control-Board-338.cfm
    just one click on the picture and it expands to show great detail of the
    resistor in question.
    Thanks, Mikek
     
  16. Baron

    Baron Guest

    amdx Inscribed thus:
    Looks like 4k7 10% 1/2W
     
  17. Jamie

    Jamie Guest

  18. amdx

    amdx Guest

    Yes, 4k7 (just repeating what everybody is saying).

    Read this, perhaps it's better to buy another dryer, with better
    circuit board.

    http://forum.appliancepartspros.com/dryer-repair/57438-help-kenmore-dryer-broke-twice-one-week.html

    Maybe? This one is all electric, it lasted 8 years. So far I $1.24 in parts
    plus $4.50 shipping, I ordered some other
    parts too. I'll find a resistor in my junk box, if it fixes it great, if not
    then I'll have to decide if I want to spend another
    $43.00 for the new PCB or get a new dryer. I'm tempted to replace the PCB.
    If I could get three more years out
    of the dryer, I think I'd be ahead. I could get a lot more, one more year
    and the last kid will be out. Then it's just
    3 loads a week, maybe 1.5 hours run time.
    As you know, "Predictions are difficult, especially about the future!"

    Mikek
     
  19. Tom Biasi

    Tom Biasi Guest

    "amdx" wrote in message

    " As you know, "Predictions are difficult, especially about the future!"

    Mikek


    One of my favorite Yogi-isms.
     
  20. amdx

    amdx Guest

     
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