hmmm Mod-t dead????

[r.d. terramir]

Hello guys and gals,

the following problem after being idle for about a month and a half,

tried to run the test print my friend wanted it as a keychain and the temperature would rise to 136c-141c and then go back down to about 107C then the print fails something is off here.anybody here have any clues what the problem could be?

terramir

[r.d. terramir]

I tried this and while it didn't help it did tell me something I
noticed even though the thermistor had to me dead cold when I started
heating it read 106C so I am assuming that there is some sort of
disconnect of the thermistor a creeping kind and as it heats up it
gets worse that's why the temp starts dropping again I assume. this is
an NTC thermistor right? from 106c to 130 and then back down to 106
this doesn't make sense.
something is seriously wrong here
terramir


---------- Forwarded message ---------
From: Wesley Knapp
Date: Sun, Dec 30, 2018 at 6:35 PM
Subject: Re: [mod-t] hmmm Mod-t dead????
To: r.d. terramir <terramir...@gmail.com>


Disconnect the hot end cable and reconnect. Sounds like it could be
power problem. If that doesn't help then it may be the heating
element or the thermistor.

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[Efrain Perez]

In my experience could be a thermistor or the thermal fuse. I have replaced more often the thermal fuse but both have fail on my mod-T.

This are the ones I use for replacement:

Thermistor: 

https://www.amazon.com/gp/product/B01N4KY6TR/ref=ppx_yo_dt_b_detailpage_o01_s01?ie=UTF8&psc=1

Thermal fuse

https://www.amazon.com/gp/product/B06X8ZNYQZ/ref=ppx_yo_dt_b_detailpage_o01_s01?ie=UTF8&psc=1

Keep in mind that this parts should not be solder.

Regards.

[r.d. terramir]

does anyone know the original thermistors beta value, just using any
which one willy nilly could lead to temperature inaccuracies. I mean I
got some thermistors laying around I could probably use but only if I
know the specs of the original will I know if they are close enough.
terramir

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[Randy82103]

Usually it's the fuse that's broken. Replace it as suggested, or test it by simply pulling it our of the heater block and shorting it out.

Personally, I just twist the two fuse lead wires together and move on...

[r.d. terramir]

I actually checked and well if I move the thermistor wires the resistance changes I'll have to get into it a little more to really figure out where the weak connection is or if I have to replace the thermistor all together.

terramir

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