"DaveC" wrote in message
...
Oh, and I believe that is the heater circuit for the jets.

There is 18 inches (45 cm) between this pcb and the print head. Hmm...

Thanks for your reply.


I had a wild guess along the same lines (not saying SMF was guessing - just
me). Maybe a heater element inside the black cylinders causes air expansion,
pushing air down the tubes as a purge function?????????