Thermal print heads heat and cool with every dot made, and the type that
are part of the cartridge are simply not designed for long term use.
They do indeed burn out. Most of the time they do so by a group of
nozzles no longer work. A whole head suddenly not printing, while
certainly possible is more often a clogging issue. Might be a bad
refilling.
On some HP and Canon models, the heads are
user-replaceable. They certainly were on
The Canon S9000 series, and on the HP
DesignJet series. And surprisingly
inexpensive, at that.
FWIW, when my S9000 died, after about 18
months of hard use, it wasn't the head
that died, but the main circuit board.
My DesignJet 30 was sold after exactly
a year of hard use, with all six heads
in perfect condition.
Still a mystery to me why Epson doesn't
make their heads user-replaceable.
rafe b
www.terrapinphoto.com