Heating Issue
Hello everyone,
I have run into an issue with my heating elements. I have roughly 35 days of operation on the printer with no other faults. My issue started with 4 thermal runaways, however now I have no consistency controlling the thermal. Some times the extruder will preheat within 5-10 degrees of temp then just stop heating both the bed, and extruder. Other times I cannot get any response from either heating elements when they are preheated. Typically I get a bed preheat error.
I have essentially reassembled the enitre machine with no luck. Every wire has been inspected and if possible reseated. All the fuses are good. The heating be does have any damages to the tape or the probe under the tape. For good measure I flashed the most recent firmware.
I have noticed that during the times it fails to heat the LEDs on the control board and bed show no activity.
Any help would be greatly appreciated.
Re: Heating Issue
you mentioned you checked all the wires physically, but do they check out electrically as well?
1. Does your probe measure ~100k at room temp? (can check at the connector)
2. If #1 is YES, then can you measure 24v both at the einsy board terminals AND and the solder pads on the bed?
#2 happened to me and was a little confusing since the probe was good and the board was outputting 24v correctly but the wires pinched in the middle so that 24v never made it from the board to the bed. It would take a bit of the board trying to preheat before realizing that it wasn't actually heating and giving me an error.
Re: Heating Issue
I think my EINSY board just isn't sending power to the hardware. I did continuity checks to both the hot end and the heating bed, both of which had no voltage when preheated. Am i missing something? the heating bed clearly works when i power it with a 9 volt. Any help would be much appreciated. At this point i am looking to just buy a new one any vendor suggestions.
Re: Heating Issue
Please, check this post...
Bear MK3 with Bondtech extruder
Re: Heating Issue
Thermistors at the extruder are known to fail - especially if printing at higher temps for mats like Nylon. A thermistor can appear good at low temps, then fail as temps go higher. So when cold starting, everything works as expected then fails as the hot end nears operational temps.
Heat everything up until it stops working, power down and quickly unplug and measure the thermistor. If open, you have a suspect.
Re: Heating Issue
Please, check this post...
Thermistors at the extruder are known to fail - especially if printing at higher temps for mats like Nylon. A thermistor can appear good at low temps, then fail as temps go higher. So when cold starting, everything works as expected then fails as the hot end nears operational temps.
Heat everything up until it stops working, power down and quickly unplug and measure the thermistor. If open, you have a suspect.
The board itself isn't sending any current to the extruder or bed when it's preheat heated, however all of steppers work just fine in manual control.
Re: Heating Issue
This might be a language/translation issue, but "The board itself isn't sending any current to the extruder or bed when it's preheat heated, " is a contradiction. If power never gets to the bed or extruder elements they can't be heated or preheated.
Are you saying that the bed and extruder are NOT warming up when you select Preheat from the menu?
I'll make the assumption that's what you mean. Have you tested all of the fuses?
Re: Heating Issue
There is no heating when preheat is selected. My thought process makes me assume the board has something to do with it. I can't measure any current coming from the board to heating bed terminal or the screws on the hotend. All fuses have been tested however increased electrical resistance has been noticed, but this wouldn't account for an entire loss of current.
Re: Heating Issue
Did you check for voltage at the power in terminals from the supply? Should be 12v across PWR-IN and BED-IN if power supply is working properly.
Re: Heating Issue
ps - the motor voltage test points on the EINSY board schematics say 12v, the Mk3 manuals say 24v. ymmv.