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  1. #1
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    Thermofuse Cross-section

    jonezy999's Avatar
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    Thermofuse Cross-section

    Does anyone have a cross-section of a thermofuse?

    Trying to explain to someone why throwing em on the floor to "reset" them isn't a good idea.

    Cheers J.

    I have not failed. I've just found 10,000 ways that won't work. ~Thomas Edison

  2. #2
    Service Manager 1,000+ Posts
    Thermofuse Cross-section

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    Re: Thermofuse Cross-section

    Thermofuse or thermoswitch?

    Here's a Thermofuse

    thermosicherungen_aufbau.jpg

    Hans


  3. #3
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    Thermofuse Cross-section

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    Re: Thermofuse Cross-section

    Quote Originally Posted by Hansoon View Post
    Thermofuse or thermoswitch?

    Here's a Thermofuse

    thermosicherungen_aufbau.jpg

    Hans

    Cheers Hans, umm perhaps I meant thermoswitch, Ricoh just calls them thermostats.

    I now have a new desktop deckground though

    I have not failed. I've just found 10,000 ways that won't work. ~Thomas Edison

  4. #4
    How'd ya manage that? 500+ Posts zed255's Avatar
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    Re: Thermofuse Cross-section

    Jonezy,

    Sorry no graphic for you, but the issue as I see it is the bi-metal disk. Once a high enough temperature causes mechanical 'inversion' and it is subsequently 'reset' it will flip to the inverted state more readily during future use. Call it fatigue, loss of pre-conditioning or whatever. The disk when tripped simply push the switch contacts apart. Also, these switches are not environmentally sealed and arcing is more likely following a reset due to contact contamination.

    Zed
    One out of four people is mentally unbalanced.
    Think of your three closest friends...
    If they seem okay, then You're The One.

  5. #5
    Master Of The Obvious 10,000+ Posts
    Thermofuse Cross-section

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    Re: Thermofuse Cross-section

    This came from the SENSASYS website. It's not a copier thermal switch, but it does illustrate the principles involved. I hope it helps. =^..^=

    BiMetal Thermostat.JPG

    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.
    3) if you're going to ask about jams include the jam code.
    4) if you're going to ask about an error code include the error code.


    blackcat: Master Of The Obvious =^..^=

  6. #6
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    Thermofuse Cross-section

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    Re: Thermofuse Cross-section

    Cheers all, much appreciated.

    I have not failed. I've just found 10,000 ways that won't work. ~Thomas Edison

  7. #7
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    Re: Thermofuse Cross-section

    From the above diagrams it should be clear that the two components are two different things. What unites them is the variable THERMO, the heat which alters their state of existence. The thermofuse melts once and can only be replaced with another one. The thermostat or thermo/switch can break and/or remake contact depending on the temperature. But frankly speaking even me I don't understand the principle under which ''hitting'' the thermoswitch on the hard floor causes this contact to remake, although I have done it many times in the field & sometimes it does work. Another alternative is to keep it in a freezer overnight- this one can be explained!


  8. #8
    Field Supervisor 1,000+ Posts
    Thermofuse Cross-section

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    Re: Thermofuse Cross-section

    I reset them all the time with no problem. The only exception is when the machine got WAY too hot before it shut down - don't know why, but it melted the pressure roller and a bunch of other stuff - I suspect there was something wrong with the thermostat to begin with. There were lots of them back in the day that had a reset button built in, but then the mfgr realized he could sell more if they were not resettable.

    Be careful in teaching your children it is acceptable to abort an inconvenient unplanned pregnancy because they may also determine it is acceptable to euthanize an inconvenient elderly parent.

  9. #9
    Field Supervisor 500+ Posts DWise's Avatar
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    Re: Thermofuse Cross-section

    We have thrown our fair share of them as well... Seem to work nicely for us

    Do for one what you wished you could do for everyone. - Andy Stanley

  10. #10
    Geek Extraordinaire 2,500+ Posts KenB's Avatar
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    Re: Thermofuse Cross-section

    In the highly unlikely even that the worst should happen, and the connection NOT get broken when it should, I don't think I would want to be the tech responsible for that fix.

    Some years back, we had a tech replace the 91 degree scanner lamp thermal fuse with a 192 degree one (from the fuser) on a Canon NP400 to get the customer running.

    Whatever circuit it was that controlled the scan lamp stuck "on" after-hours that night.

    The following morning, the customer was greeted by a blob of molten plastic parts, including the bulk of the doc feeder.

    We had an emergency service meeting the following morning getting warned to NEVER EVER do that.

    (No, the tech did not get fired, as he had a very good relationship with the customer, but almost anyone else probably would have.)

    So, just when is this "old enough to know better" thing supposed to kick in?

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