My Mk1 has been chugging along for 2 years, and hasn't had much in the way of issues. The biggest one was the heatbed port on the Rambo board fried and generated some obnoxious smoke about a year ago. I replaced the board with a new board from utilmaker and was back in business.
This past week, after finishing a print, the heat bed wouldn't come back up to temp. The hotend would come up to temp just fine. No burning smell, everything seemed normal. After fiddling around - power off, power on, unplug, plug in), now the printer won't power up at all. Normally there is a green light on the board itself, but no light and the LCD screen doesn't light up either.
I've done the following:
- Continuity tester on the brown fuse next to the ports where the Power Supply wires come in - seems fine
- Continuity tester on the fuse in the plug on the power supply - seems fine
- Volt reading on each pair of wires coming from the power supply to the board read around 12v and change. I'm not deep into electronics, so I'm assuming that with 4 wires coming into the board, and each pair bringing 12v, that should be what is expected.
I had originally thought the power supply had died, but given the above, I'm not so sure.
Anybody have any thoughts or recommendations?