Hello everyone! I am the proud owner of a UM2. I have been using this printer for five years now with very little to no problems at all.
Unfortunately, yesterday morning I switched the printer ON as usual and to my surprise I received a warning message showing a "Z switch broken" error. I kind of knew from the beginning that the switch wasn't the issue. However, just to be sure, I checked the switch on both Pronterface and the multimeter. As expected it works perfectly. Now, after reading a few discussion on this forum I realised that it could be a problem with the stepper motors. So I tried the following:
1. Move every motor (including the extruder) on Pronterface, no response.
2. Check bed and nozzle heater, they work perfectly.
3. Check the voltage across the K1 relay, I get 4.9V between 1-2, 24.5V between 2-NO and 2-C, 0V 2-NC. I hear it clicking. I also added a wire to connect C with NO. Nothing changed.
4. Checked a few TPs. They all show the correct voltage.
5. Reset to factory settings.
6. Uploaded a new firmware.
7. Power cycled the power supply.
You guessed it right, none of them worked. What's next to try? Don't tell me to buy a new board 😢
Thank you!
Fed