Possible xCore device burnout? / Extremely slow printing

[mozcelikors]

It certainly doesnt look like a perfect sine

[henk]

I thought it would be more or less a square wave; it is the output of an inverter. Can you attach an image?

[mozcelikors]

I did in the first page last message. Thanks for taking your time to help me by the way. Truly appreicated.

[henk]

Missed that one - is the signal really either side of ground? Just check that the ground connection of the probe is solid.

I had expected something more square between 0 and 3V3; something like page 14 of <http://www.icbase.com/pdf/add/ti/AN-101-00039en.pdf>.

If the output of the inverter is really that bad, then either the inverter is gone, maybe the input to the processor? You could put a scope probe either side of the inverter (schematics attached); and see whether that operates as expected.

If you have an inverter lying around, you could try and replace it. A bit fiddly, but not impossible. No guarantees that that will fix it, but cheaper than a new board?

Cheers,
Henk