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Post by kioskfan on Jan 9, 2018 22:01:44 GMT
Right in the middle of a seven hour print! I've seen it a couple of times recently but it happened during warmup and I dismissed it to the house being cold in the morning but not this time. Ideas?  mintemp by kioskfan, on Flickr |
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Post by 3dprintingmeathead on Jan 9, 2018 22:48:59 GMT
mintemp error means you have a busted or disconnected thermistor. Min temp is 5c, 41f, set in the firmware. That way, if a sensor becomes unplugged or shorted or malfunctions, the printer will know immediately it is not reading actual temp.
Recommend starting at the board, check connections, then hot end, check connections, then trace wire and look for shorts. Then check the board for burnt marks or pcb shorts. Most likely something came unplugged. You would have yo reset the board after repair I think, but I might be wrong on that
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Post by kioskfan on Jan 9, 2018 23:20:25 GMT
mintemp error means you have a busted or disconnected thermistor. Min temp is 5c, 41f, set in the firmware. That way, if a sensor becomes unplugged or shorted or malfunctions, the printer will know immediately it is not reading actual temp. Recommend starting at the board, check connections, then hot end, check connections, then trace wire and look for shorts. Then check the board for burnt marks or pcb shorts. Most likely something came unplugged. You would have yo reset the board after repair I think, but I might be wrong on that Okay did all that and checked the readings while moving the wires and everything looks good. I'll try the print again  Thanks man. Now I'm looking at those new mainboards differently! Would have been nice to continue the print instead of wasting three and a half hours. |
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Post by kioskfan on Jan 10, 2018 4:58:17 GMT
Got another error. It's an intermittent problem so which thermocouple do I try to switch first? Anyone heard of using prontoface as a diagnostic tool?
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Post by tanephar on Jan 10, 2018 9:21:56 GMT
I would run an M303 PID autotune, the hot end is the only one enabled, or try doing a preheat from the firmware, just one at a time, hot end first, you should error and know what thermistor to swap out. Thermistors do break down over time.
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denis
New Member
Posts: 18 
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Post by denis on Jan 10, 2018 15:23:43 GMT
the thermistor should have a resistance of 100 kilo Ohm ,and is specified in the firmware,try a tester(multimeter)on the chip near the motherboard,just unplug the connector,should be about 100 kilo Ohm.thermistor operation zakljuchaetsja that when temperature changes, changes its internal resistance.
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Post by kioskfan on Jan 10, 2018 17:30:44 GMT
Everything tests out when stationary so it's pretty hard to determine. Maybe I'll just swap both? Anyone know of a good supplier for thermistors?
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Post by 3dprintingmeathead on Jan 10, 2018 17:36:00 GMT
I think you can pull up the code in pronterface. I'll have to check the m commands and see which one will read errors, it should tell you the thermistor number, hot end is zero, bed is 1 I believe
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Post by kioskfan on Jan 10, 2018 17:37:39 GMT
I think you can pull up the code in pronterface. I'll have to check the m commands and see which one will read errors, it should tell you the thermistor number, hot end is zero, bed is 1 I believe It's a little silly that the error message does not indicate which sensor. How hard would it be to say "MINTEMP1" OR "MINTEMP2"? |
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Post by 3dprintingmeathead on Jan 10, 2018 17:39:44 GMT
Gotta love those 8 bit boards. That's a whole other character the processor has to handle. If it did that for everything, there wouldn't be any processor power left to print
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Post by 3dprintingmeathead on Jan 10, 2018 17:43:46 GMT
I guarantee, there is a short or loose connection somewhere. The thermistor is just a resistor, so when it goes it never reads again.
A good place it could be hiding, if not at the board itself, is at Chafe points like where the bed wires are zip tied in the back or the hot end wire constraint. Dillagence and thorough wire tracing is needed, look for insulation that seems worn or crushed, thin spots, stretched spots etc.
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Post by kioskfan on Jan 10, 2018 18:31:07 GMT
I think you can pull up the code in pronterface. I'll have to check the m commands and see which one will read errors, it should tell you the thermistor number, hot end is zero, bed is 1 I believe I've got Matter Control running here and it seems to have much better control than Ponterface. Alas so far nothing has failed during my testing! |
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Post by kioskfan on Jan 10, 2018 18:32:25 GMT
I guarantee, there is a short or loose connection somewhere. The thermistor is just a resistor, so when it goes it never reads again. A good place it could be hiding, if not at the board itself, is at Chafe points like where the bed wires are zip tied in the back or the hot end wire constraint. Dillagence and thorough wire tracing is needed, look for insulation that seems worn or crushed, thin spots, stretched spots etc. I've got the harness open now and started to resolder and check the splices they've hidden in the harness. |
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Post by tanephar on Jan 10, 2018 20:18:27 GMT
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Post by kioskfan on Jan 10, 2018 23:12:25 GMT
Harnesses and connectors look okay. What I'm doing now is running another print but I have Matter Control connected and I have it logging the DP5, the theory is if something screws up I'll have the logs to see which sensor crapped out, if it does.
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Thanks man.
