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.
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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
Thermofuse or thermoswitch?
Here's a Thermofuse
thermosicherungen_aufbau.jpg
Hans
Originally Posted by Hansoon
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
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.
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.
5) You are the person onsite. Only you can make observations.
blackcat: Master Of The Obvious =^..^=
Cheers all, much appreciated.
I have not failed. I've just found 10,000 ways that won't work. ~Thomas Edison
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!
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.
73 DE W5SSJ
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
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.)
“I think you should treat good friends like a fine wine. That’s why I keep mine locked up in the basement.” - Tim Hawkins
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