Sort-of a tangent to the 'contact lubricant' thread...
I've just bought an HP9125 plotter for my 9100 :-). For those who don't
know this device (built entirely from discrete transistors from what I
can see), it's basically a calcualtor interface (4 boards of logic)
driving a pair of DACs, driving an analogue X-Y plotter. Anyway, the last
part has slidewires (essentially long sliding potentiometers) to detect
the pen position and provide a feedback signal to the servo circuits.
The HP service manual (OK, it's a boardswapper guide, but I read all the
information I can find...) says you have to clean said slidewires with
special cleaner and then coat them with special slidewire lubricant. Of
course I want to make my slidewires last as long as possible, getting
replacements is non-trivial :-)
Does anyone know what modern product I should use?
-tony