HP680 Chart Recorder
 

Does anyone know of a web site where I could access a copy of a
tech manual for this chart recorder, I've had a quick search but nothing
obvious comes up ? I've saved a couple of units from being trashed,
cleaned them up & got them working but they're a variant that uses an
electrical contact type of pen. I'd like to convert this to an ink pen
and have some ideas as to how I can do it but I'd also be interested in
knowing the HP arrangement.

Particularly interested in knowing where HP mounted the ink
reservoir, was it on the moving carriage that carried the pen or is it
on the fixed body of the recorder ? Maybe someone has had experience of
using this equipment and can describe the arrangement they saw when
refilling the ink reservoir. Or did HP use disposable ink cartridges ?
--
Dick
GM0MNL