My scope is Instek OS-622B.

The switches and potentiometers need to be cleaned. To do that I need to remove the front panel of the scope to get at them. Removing all of the knobs is the first step in taking off the front panel. Each of the two Volts/ division knobs has two holes at a right angle through the knob perpendicular to the shaft. I would expect to find a set screw with a slot or an Allen head, but I'm not seeing either of those. What I see appears to be a (very small) cylindrical inset.

Does anyone know how this type of knob is removed? Thank you very much if you do!

Pete

 

It is possible that the screws are 1mm or 1.5mm Allen head. Being that small, I imagine seeing the faces of the socket might be difficult.

My plan to clean the switches and pots (if possible) is to spray them with a contact cleaner. Is that something that would do work?

 

It is possible that the screws are 1mm or 1.5mm Allen head. Being that small, I imagine seeing the faces of the socket might be difficult.

My plan to clean the switches and pots (if possible) is to spray them with a contact cleaner. Is that something that would do work?

I use:
https://caig.com/product/deoxit-d100l-2c/

 

I use:
https://caig.com/product/deoxit-d100l-2c/
View attachment 333741

Thanks, I'll look into using that cleaner. Possibly the switches and pots would be accessible enough to get at them with a squeeze tube. An aerosol can might be overkill for the amount of cleaning that I might need to do now and in the future.