Voltage standard range switch contact cleaning

[valley001]

Hi all,

I am starting a separate thread on this topic since this is a (I think) mechanical issue. 

It seems the range selector switch on my Fluke 332D is unstable.  If I switch between 10 and 100v ranges it will not settle back to the same reading with the readout at 0.000000, I see at least a 150uv deviation.  If I apply counter clockwise pressure to the switch I can get it to bounce around fairly easily.  I has been difficult to separate this issue from the electrical issues on my unit since some of the problems with settling 0 are/were due to bad caps. 

Attached is the type of switch.  It has sealed contact wafers with access holes about the contact.  I assume this is not the type of device to go spraying deoxit into..but I am wondering if I applied a little with a toothpick or something?  I would hate to attempt to clean these contacts only to make the problem worse, advice/ideas are appreciated. 

[dacman]

The way I once fixed one of those gray boxes that had a non-repeating range switch was as follows:
(I'm sure I tried to use some DeoxIT from a needle bottle, but that did not work.)
1) I stood the unit on its handles and leaned it back some
2) I took some LPS Contact Cleaner or IPA and saturated the switch (either will work as a contact cleaner, IPA will work in this instance)
3) I exercised the switch several times (IPA or Contact Cleaner will cause the switch to start to bind)
4) I took some LPS PreSolve and saturated the switch and exercised it several times
5) I took some LPS-1 and saturated the switch and exercised it several times
6) I repeated this for about 30 minutes or more (maybe an hour)
7) This was done several years ago and the last I knew the unit was still working fine

Contact Cleaner or IPA can cause the destruction of the switch contacts so it will need to be lubricated.
LPS-1 is classified as a dry lubricant, even though it is sprayed on.
https://www.lpslabs.com/product-details/560

[feedback.loop]

I would suggest MG Chemicals contact cleaner with PPE
https://www.mgchemicals.com/products/cleaning-products-for-electronics/cleaners/contact-cleaners/super-contact-cleaner-with-ppe-801b

[valley001]

Thanks all.  Ill look into those products.