Electronics > Beginners
Button contacts dirty or ?
fixit7:
I am having to press down multiple times on some of the buttons to get that function to activate, especially the memory button.
There is a thin film of plastic over those "silver things" that activate the various functions.
Any ideas as to why it is happening?
Thanks,
Andy
I am curious as to how the lcd display is used as there are no wires
ataradov:
Sticky tape is just there to hold them for assembly. If you remove it, the silver dome will fall out and you will be able to clear the dust from underneath.
LCD is connected using a zebra strip - https://en.wikipedia.org/wiki/Elastomeric_connector.
fixit7:
--- Quote from: ataradov on July 04, 2019, 01:20:08 am ---Sticky tape is just there to hold them for assembly. If you remove it, the silver dome will fall out and you will be able to clear the dust from underneath.
LCD is connected using a zebra strip - https://en.wikipedia.org/wiki/Elastomeric_connector.
--- End quote ---
As far as I can see, that plastic is needed to keep those contacts in position.
I am reluctant to take it off for cleaning and then having a non-functional timer.
ataradov:
There are multiple variants. some have alignment pins, others do not. If there are no holes in the PCB, then yes, yours do not.
It is really not that scary and hard to disassemble. There is nothing precision about them.
But if you do not want to clean them, then why post a question in a first place?
Gyro:
I've had good success injecting contact cleaner into the contacts from the rear of the PCB. The problem tends to be contact oxidation, either the PCB centre contact or the stainless steel dome itself, probably both.
The button centre contact always goes through a PCB via behind the centre of the dome, this is always an open (non-tented) via to allow air in and out as the dome is pressed. Just put a drop of your favourite contact cleaner/conditioner, Electrolube EML in my case, but probably Deoxit something in the US. Exercise the dome and you will see an air bubble appear when you press it and the cleaner drawn in when you release. Do this a couple of times and then wipe off any excess.
I've done this on several dome contact remotes with long term success, in fact they tend to improve with time.
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