On 12/07/2016 05:19, Ralph Mowery wrote:


I have not used it but just bought a spray can of Deoxit. From reading
about it, it seems to be the greatest stuff for cleaning contacts.

I have an old Tectronix Scope 465B that one chanel has a flakey input
switch. The manual says only to use isopropal alcohol to clean it
with, I did that with some 99% and it helped some, but thinking of
using some of the Deoxit on the switch. Would that be ok or not.

I would hate to mess up the switches as they would be almost impossiable
to find replacements for .


The little fork-shaped things that touch the PCB are exposed to dust in
those scopes. If you put any kind of lubricant, that will probably
collect more dust and increase your problems. I think that is why Tek
recommends a cleaner that leaves no residue that the dust could get
stuck to. Why not try what Tek recommended, especially if it is still
available (non-CFC).

Often on the 475 (I guess similar) the input attenuator things would
have bad contact with the sockets that they are in. Just unplugging them
and re-plugging them (one at a time so as not to mix them up) usually
cures that, though I am willing to believe that some contact cleaner
wiped just on the attenuator pins (not sprayed everywhere) might help
since dust shouldn't get in there.

Chris