I have a cr-10 that the temperature reads lower than actual during heating process. I have replaced the thermistor 3 times and the heating cartridge twice. I ensure that the screw holding in the thermistor is not to tight or too loose by ensuring the temp read out is around 20°C. I know that it's getting hotter than what it claims because the PLA filament comes out burned and the smell of burning plastic. Any ideas on what could be wrong?
#CR-10 Printer Heat Issue
safe jasper
safe jasper
No, the sock has never worked for any printer I've used. I currently have 3 cr-10s running with no sock
I actually just replaced the thermistor again because the last one the plastic melted off the end.
And I just got the max temp error again.
stray token
you sure the mosfet on your board is not burned?
safe jasper
Is it possible I have the wrong voltage of heat cartridge?
stray token
the cr 10s is still 12 volt right?
safe jasper
I haven't opened up the motherboard yet.
stray token
if it always overheats there is a chance that a mosfet or so is fried an or a connector is burned
safe jasper
I did notice that the bed temp changes when I only try to heat up the nozzle. Currently the bed temp reads 117°C but I haven't set a temp for it and the bed is cold.
stray token
that sounds like board error to me
safe jasper
That's frustrating because it was working perfectly up until I had this heat issue
stray token
well if its an og cr10s its pretty old now
and i guess it has some time printing too
safe jasper
Well it's newish because no one has put any maintenance work into it.
Just opened up to take a look at the motherboard but it doesn't look like there's any issues
Maybe a firmware change. I think it has the original firmware
stray token
is that a cr10s or a cr10spro
stray token
okay sometimes also the cable in the connector breaks
that was the first thing that broke on my cr10
so maybe the complete cable broke
safe jasper
Thanks I'll take a look at it when I get the chance again.
safe jasper
I opened up the cable plug and everything looks okay. No burned ends and it looks like the wires are securely soldered.
safe jasper
Measure with a multimeter?
safe jasper
So the thermistors are reading 100k resistance and the heat cartridges are reading just under 12v. So does this mean there is an issue with the motherboard?
vast lark
Just as a sanitycheck, while the thermistor is disconnected does it still show 20°C?
In any case next step I'd do is connect a 100k potentiometer to thermistor input and check if the value is read correctly to exclude either mainboard or thermistor
safe jasper
It reads 16deg on the nozzle and -14deg on the bed.
vast lark
If that is with the thermistors disconnected then there is your problem. Assuming this is a regular 100k ntc, 16°C should be around 150kohm, but with them disconnected you have infinite resistance, which should show you either a error (ADC out of range) or the lowest temp it can display.
safe jasper
So I have a problem with the control unit?
Those temps were with the thermistors disconnected.
safe jasper
Or the firmware
vast lark
Either board or firmware if it doesn't go error when thermistors disconnected.
But if it is firmware, it must have started happening after you flashed whatever the firmware is that's currently on there, i assume you would have mentioned that, so i assume board.
Could also be a wire clipping on the board bridging the adc input.
safe jasper
I haven't flashed any firmware. It was working then all of a sudden heat errors.
I took a picture of the motherboard earlier in this chat
vast lark
If it started happening out of nowhere, and you get 16°C with the thermistor unplugged I'd guess that input died.
vast lark
I took a picture of the motherboard earlier in this chat
But the display cable covers the important bit like the version number and the whole area of the board between the mcu and the input that doesn't work.
Anyway, If yours says 1.1.2 -> Pin30 is pulled up so it should measure 5V with the thermistor unplugged if it doesn't maybe the resistor died, that would be a easy fix.
When it does say 5V you can make extra extra sure and flash a Arduinosketch to analogread PA7, it should return 255 or a number near that with the thermistor unplugged. btw schmatic for 1.1.2: https://github.com/Creality3DPrinting/CR10-Melzi-1.1.2/blob/master/Circuit diagram/Motherboard/CR-10 Schematic.pdf
stray token
maybe clean it that dust might cause something to overheat
safe jasper
I found out that before I got this printer it was accidentally ran at 230v while connected to a 120v plug. It was changed back before I got it but it would explain the motherboard problem.
stray token
surpringly that it even run 😮
vast lark
How did it not blow up? Oh, nvm 230V device in 120V plug won't blow up.