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Toaster help

Discussion in 'Hobby Electronics' started by Dave, Nov 1, 2008.

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  1. Dave

    Dave Guest

    I KNOW this is a risky topic here . . please do your best to refrain from
    abusing anyone, making reference to abusing anyone or making reference to
    abuse by anyone!

    I have a not-old Sunbeam Model A3220 Toaster that has ceased working (unless
    I press down hard on the handle). It turns out the solenoid that holds a
    hook that holds the toast "carriage" down doesn't operate (though it seems
    to have continuity). Does anyone know the board? Does anyone know if there
    is a common fault on the board?

    There is a component marked TH (with 204 on it) that could be a thermistor.
    It appears to be open circuit, so could be the problem, I guess. There are a
    coupe of diodes, several transistors, a rheostat and a couple of capacitors,
    so it is quite simple - though probably beyond me. I haven't yet removed
    and replaced any parts but thought I'd see if anyone knows the circuit
    first.

    Any expernience/knowledge? Our last toaster was electro/thermo/mechanical
    with no electronics at all.

    Thanks folks.

    Dave
     
  2. Franc Zabkar

    Franc Zabkar Guest

    An NTC thermistor will have a high resistance when cold, and a low
    resistance when hot.
    Test the active components with a DMM.

    Otherwise here are some useful resources:

    Small Household Appliances repair FAQ:
    http://www.repairfaq.org/sam/appfaq.htm

    Results of US patent search:
    http://www.google.com/patents?as_q=...&as_miny_ap=2008&as_maxm_ap=1&as_maxy_ap=2008

    http://preview.tinyurl.com/6dls2n

    - Franc Zabkar
     
  3. Eeyore

    Eeyore Guest

    Was this aimed at Phil Allison ?

    Graham
     
  4. ian field

    ian field Guest

    The component marked 204 could be a thermal fuse.
     
  5. Dave

    Dave Guest

    Thanks Franc,
    I'd found the first one but in all my use of Google, i was not aware of the
    Patents datatbase . . thanks very much.

    dave
     
  6. Dave

    Dave Guest

     
  7. Dave

    Dave Guest

    Thanks Ian,

    It sure doesn't look like a thermal fuse . . but could be, I guess as I am
    not well exposed to the world of thermal fuses! It is round/disc, black,
    glazed and LOOKS more like a smallish (4mm) ceramic capacitor.

    I'll get onto the job today and see how I go. I miss my toast.

    dave
     
  8. ian field

    ian field Guest

    From that description I'd suggest maybe a VDR.

    It would normally read O/C until you exceed its hold off voltage - that
    should be the peak value of the mains plus a safety margin.
     
  9. Dave

    Dave Guest

    Because of the size and location of the mains voltage board, I treated it
    with respect. After a bit of testing of individual components I couldn't
    find any electronic component obviously faulty.

    Eventually it transpired that whilst the thing would toast when firmly held
    down (i.e. power was applied to the elements and circuit board), any slight
    movement "un-applied" voltage to the circuit board whilst the element was
    still powered, so the solenoid dropped out. It turned out that a post
    holding a primary contact was slightly bent and a reliable connection
    couldn't be made.

    I'm not sure that this clarifies the issue for readers, but it is a weak
    electro-mechanical point in this toaster.

    Thanks to those who replied.

    dave
     
  10. Franc Zabkar

    Franc Zabkar Guest

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