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Agilent 34401A button repair
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buck converter:
I have some 34401A and they all have issues with the button pads. A lot of the buttons, especially the shift needs a lot of pressure to activate. Is there a best practice for repairing this?
Thank you in advance.
robert.rozee:
disconnect the ribbon cable to, then carefully remove, the front panel. disassemble PCB from the rest, and (gently) clean both the conductive rubber button pad contacts as well as the PCB contacts with IPA or similar, then see if there is an improvement. i'd be a little surprised if the conductive rubber had deteriorated, but others may be able to comment further on that.


cheers,
rob   :-)
coromonadalix:
https://www.ebay.com/itm/362513186617?

hurry  loll
NoisyBoy:
I second Robert's suggestion.  If it doesn't work, perhaps some Caikote 44 may work if you don't want to change out your keypad. 

While you have the keypad out, it is also a good time to clean the sides and the part behind the front panel, as well as the openings around each key on the panel.  It can make your 34401a keypad look new again.

Good luck.
buck converter:
I have attempted repair on one of my units so far. I rubbed IPA all over the pcb and button membrane, twice. It improved most buttons, leaving just one that needs to be jammed in to activate.
Is there a different chemical that performs better? I have a few more units with the same issue. These are from a classroom lab and saw daily use from multiple sections a day for who knows how many years.
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