I am in emotional roller-coaster right now. I have a feeling that the board is dead or about to die.
Just finished printing the parts for the fan. the part surrounding the extruder went smoothly. The part that attaches to the frame was harder. It kept destroyting the first three layers, so I decided to print those extra slow (50% of the initial speed). After the three layers, I gave 100% speed. The board’s temperature was going from 45C to 55C. That was different to the previous print outs. Why would it not stay at 50C?
Afterwards I started extensive testing with the printer settings and whether I need to replug the 15V power supply. Quite a few times it went with flying colors and then the error reappeared. I noticed that the LEDs were not as light as before (well, they got always dimmer as I plugged the 15V power, but this time a lot dimmer). So I took all the connections out and reattached only usb and power supply. Then I noticed that the part labeled 7805abd21rdnf40g (right to the 15V power supply) was getting rather hot (over 40-50C). If that chip is responsible for stabilizing voltage/current, I can imagine under what kind of load the poor guy had to operate. Cause the power supply is oscillating between 13 and 15.5 like crazy.
@Wrong_Way, do you think, you could measure the open circuit voltage of your power supply? Cause if I connect it to the machine, it is pretty stable, if I disconnect it, it starts fluctuating wildly
I’ve tested the current flow. Without any load it takes between 0.5A to 1.0A. This is 15W. Uploaded the video:
Yes, it is the voltage regulator. I suppose it produces 5V (among other things):
I’ve measured the OCV on the ouput pin. It is 5V… then it drops to 4.2V. Then it drops to 0V. And then it repeats itself. The thermal protection must be kicking in. I am depressed beyond imagination.