[BUG] Hotend Temperature stuck #560
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Printer Anycubic i3 mega P
Firmware Knutwurst 1.5.4
no modifications
Expected behavior: [What you expect to happen]
When you turn on the printer, the hotend temperature should fluctuate slightly at 21.
Actual behavior: [What actually happens]
The hotend stays at 51 and shows no changes. Even if I disconnect the hotend cable, the temperature remains at 51 and does not show the usual -14.
Additional Information
Steps I have already completed:
Did it work properly at some point and if yes, what has changed since then (e.g. firmware update or switch)?
Temperature on the display, via serial console or both?
(narrow down the problem to measurement or display communicaiton)
Does it make any difference whether you disconnect the cable on the printer side or the hotend side?
(eliminate issues with the wiring harness)
Might be a hardware issue like some broken insulation or short circuit. Stable 51°C should be around 35kΩ NTC resistance ... not very like, but he test is just 10 seconds.
Worst case might be a broken ADC input in the controller. But let's first try to narrow down the issue as much as possible.
After a few researches and measuring on the board, it might be something broken. One part should have 12V, but showing me only 7V. After the repair, i will post again
Hello,
I installed the 1.5.4 firmware including btouch and tmc2208 on my mega x today. At first, everything seemed to work. for example, I was able to carry out the complete leveling via btouch to the end and save it.
then, half a day later, I wanted to make the first test print.
during heating, the temperature of the hotend suddenly jumped to 270° C.
I switched the printer off and on again. When I switched it on, the animation with the sound came on, the btouch moved up and down briefly several times as it should and immediately afterwards there were a few (maybe 5) quiet beep noises. after that I could still operate the touchscreen but the sd card was no longer displayed and the preheat command, for example, could no longer be executed. nothing happened.
when i connect via Pronterface (which works), the beep noises also appear briefly and i can't control anything else.
after switching on and off two or three times, it started up again and recognized the sd card again. i started a print. it went to the home position but again when heating the hotend, the temperature jumped to 320°C this time and put it back into the kind of mode just described, in which nothing works anymore.
What could be the reason for this?
Regards