Hi I have a ramps 1.4 board with an SD card add on. I've been running it for about a month now.
This morning there was a power cut in my neighbourhood and since then the board has been behaving strangely.
I can connect using repetier host and monitor the temperature of the hotend and bed accurately (checked against an infra-red thermometer). I can also access and change files in the sd card.
However when I turn on the power, the device immediately disconnects from my PC.
I've checked the resistance on the heating elements fans steppers etc. to see if perhaps something shorted during the outage but they are all fine.
I have a spare board kicking about which I wired up, but it exhibits the exact same behaviour, even though it was sitting on my shelf when the power went out.
My power supply is a hacked PC supply, it is delvering about 11.95v
Any idea what could be wrong?
This morning there was a power cut in my neighbourhood and since then the board has been behaving strangely.
I can connect using repetier host and monitor the temperature of the hotend and bed accurately (checked against an infra-red thermometer). I can also access and change files in the sd card.
However when I turn on the power, the device immediately disconnects from my PC.
I've checked the resistance on the heating elements fans steppers etc. to see if perhaps something shorted during the outage but they are all fine.
I have a spare board kicking about which I wired up, but it exhibits the exact same behaviour, even though it was sitting on my shelf when the power went out.
My power supply is a hacked PC supply, it is delvering about 11.95v
Any idea what could be wrong?