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Hi
A couple of days ago the hotend wouldn't heat up and i got a couple of errorcodes/warnings in the display. The bed heats up just fine, so i ordered a new hotend parts (heater, thermistor and a new aluminum block). Changed all of this, but still the same error. I can se that the thermistor works because it changes values in the display when touching the thermistor-end. Any good ideas why the heater doesn't heat?
Do you have a multimeter? I'm not familiar with your printer, but is it possible to disconnect the heater wires from the motherboard and check the resistance between them?
Yeah, i have ohm'ed the heater. It actually was the same resistance as the one i thought was dead... I don't remember the value (I'm at work right now)
You don't want to read the resistance of the heater. You want to find the voltage being sent to the heat cartridge.
When you're able to, disconnect your heat cart and stick your multimeter probes in the socket (or touch the top of the cable screws), and heat the nozzle. Should read 24v IIRC. Based on your answer to my other comment, my assumption is the number will not change when you turn on the heater, implying board or mosfet failure.
Home, and done some measuring.
Just started the printer: 1,24 VAC
Preheating the nozzle: 0,00 VAC
After error beep: 1,24 VAC
Just started the printer: 1,57 VAC
Preheating the nozzle: 0,00 VAC
After error beep: 1,57 VAC
Old heater: 13,6 Ohm
New heater: 14,6 Ohm
So, no power to the nozzle heater. Now, how to verify the mosfet?