SoliForum - 3D Printing Community — Solidoodle 2 thermistor problems (extruder AND bed)

Re: Solidoodle 2 thermistor problems (extruder AND bed)

2015-04-22T18:01:07Z

Well, after some googling, it appears that I may have fried the input pins for both the hot-end and heated bed thermistors.

Now, my question is, can I replace the 644P with another chip and reprogram, or is there something else on the board that's broken?

Any response would be greatly appreciated :-)

Re: Solidoodle 2 thermistor problems (extruder AND bed)

2015-04-22T17:18:14Z

I actually disconnected the two thermistors and sent m105 commands and it still reports 72C for the bed and 99C for the hot-end...

Re: Solidoodle 2 thermistor problems (extruder AND bed)

2015-04-22T16:50:06Z

Have you double checked they are plugged into the correct pins?
Other idea is the wires may have a short/partial signal from the board.
Ballpark guesses

Re: Solidoodle 2 thermistor problems (extruder AND bed)

2015-04-22T01:50:08Z

Well, it wasn't the firmware... I uploaded the firmware without issue....

Any ideas out there?

Re: Solidoodle 2 thermistor problems (extruder AND bed)

2015-04-22T01:11:55Z

When I get home tonight, I plan on reloading the firmware. Maybe I messed up something when I redid the hot end cooling fan (failed to disconnect power, and got a spark). I certainly hope that I didn't cook something on the board. It appears to still be operational (I can home all the axes and send it commands)

Wish me luck

Solidoodle 2 thermistor problems (extruder AND bed)

2015-04-21T23:36:48Z

Hello,

First, my setup:
- Solidoodle 2
- Sanguinololu with 644p
- Pico hot-end
- RepetierHost

A couple weeks ago, I had a long-running print go awry. I made the stupid mistake of using solid-core wire for the hot-end cooling fan, and it developed a break about 20% into a 9 hour print.

I also made the mistake of not keeping an eye on the print. I woke up the next morning to find that the filament (PETG) had jammed and the extruder stepper continued to feed the filament, but not into the hot-end, but out the front, leaving me with a nice big ball of unusable filament.

I unplugged the printer and switched over to using my other printer for the project.

Today, I decided to plug the Solidoodle2 back in and found a few things really disconcerting.
1) Repetier is currently telling me that the hot-end is at 88C (though it is at room temperature)
2) Repetier is also telling me that the print bed is at 91.3C (it too is at room temperature)
3) I daringly ran through the auto-pid tuning routine, and while the hot-end was at (supposedly) 200C, I was able to manually push through a bunch of PETG which came out very very "liquidy" (I'm guessing it was a LOT hotter than 200C)

I've measured the bed thermistor and it reads somewhere around 70-80k ohms, and the same for the hot-end thermistor.

Does anyone have any ideas/suggestions?

Thanks in advance