Re: Stuck switches on 453


I recently worked on a larger rotary switch on a piece of an old Fluke calibrator. The dried grease can really make those shafts quite hard to turn! The HP 8640B has a similar issue with its band switch and it is amazing how much better they work when cleaned and freshly lubricated.

Good luck with it.

Barry - N4BUQ

----- Original Message -----
From: "Richard P via" <>
Sent: Friday, July 31, 2020 5:04:37 PM
Subject: Re: [TekScopes] Stuck switches on 453


Thanks, all. I really don’t know if it’s the pot, or the combined switch,
that is frozen. One or the other. I can get spray into the pot, but it still
won’t move. The rotary switch on the back, however, is sealed tightly. I
will continue to attempt to get spray into the fool switches. There are two
of these combined pot/switches in the 453. Stay tuned.


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