My apologies in advance if this has been discussed already, but I searched using all the keywords I thought that would apply to this issue and it seems no one has posted questions related to this specific type of repair yet.
The problem I am having with this unit is that some of the buttons are getting stuck in pressed position, specially those that are mechanically connected, for example, when selecting the waveform, sometimes the Pulse function button will stay engaged when one presses a different function, such as he Sine wave button.
Another similar example is the Amplitude button. This one is part of another group, that once you press say, the Frequency button, it should disengage itself to allow one to select the frequency.
I had to clean the boards on this unit really good, as it had a film of something, not greasy really, but noticeable, yet easy to wipe off, that had a very strong smell to so harsh chemical. I wonder what kind of industry this kit spent most of its working days at.
Aside from the buttons being a bit sticky, and looking to be a bit out of cal, specially in the higher end of the frequency range, it has held up fairly well so far.
I have attached some photos of the buttons I am referring to. The brass plate that joins them, which is actually composed of at least two separate thin layers, where one rides over the other and I am guessing this is where some kind of lubrication might be required.
Perhaps some more lubrication in the springs would also help? Using a graphite based lubricant perhaps?. You know where this is going, I am at a loss when it comes to bringing some "spring" back to these buttons and I would really appreciate your suggestions.
The schematic of these switches is shown in the on page 311 and on 313 of the manual I found at the Keysight support website. I attached also a crop of those pages.
Thanks in advance,
Tino