Label printer - printing head

The "local brain" is hidden under the black goop. When I have time I'll have to hook up my scope to the various contacts on the right side. I hope it is something common like power + SPI. It's bad enough that my scope doesn't have decoders built in. Maybe it's time to get a SALEAE. Not cheap, but it runs on linux as far as I can tell ;-)

So far I've identified the following ones:

top/bottom: common potential for the "top row of fingers". This is explained in one of the other images.