A30x0 keyboard

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mattdy4
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A30x0 keyboard

Post by mattdy4 » Mon Feb 26, 2018 11:54 am

Looking for a keyboard or just the membrane membrane for my A3010 as it's not typing full list of characters after storage.

Anyone with a spare please let me know. Cheers!

RobC
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Re: A30x0 keyboard

Post by RobC » Mon Feb 26, 2018 1:32 pm

I may have a spare membrane/keyboard but are you sure that's where the fault lies?

The keyboard connectors are prone to fail from corrosion or it could be the tracks leading to the connectors...

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danielj
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Re: A30x0 keyboard

Post by danielj » Mon Feb 26, 2018 1:45 pm

As Rob says, it's most likely to be the connectors or the contacts at that end. You can use PCB repair paint to fix these.

d.

mattdy4
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Re: A30x0 keyboard

Post by mattdy4 » Mon Feb 26, 2018 2:03 pm

My 3010 is the version with the battery in the top right hand corner (tiny amount of spillage, removed and cleaned) though the machine spent the last 20 years in my garage with stuff piled on top so I suspect it's made an indentation somehow in the membrane.

When I pulled it out and booted to RO it simulated a (-) keypress but once the membrane was cleaned with IPA it still has issues with that key and/or other keys though this could be due to it not being reassembled properly (sooo many clips).

The boards k/b connectors look clean and have given them a decent clean with contact cleaner but without another keyboard on hand to test I can't be sure. I do need time either way to diagnose the membrane even if I can get hold of another one, just wish there was an easy way to test. Shame no-one makes them or has reproduced them like Amiga keyboards

RobC
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Re: A30x0 keyboard

Post by RobC » Mon Feb 26, 2018 2:39 pm

You can usually spot breaks in the membrane by eye (or just test with a meter).

The PCB mounted connectors are a bit more of a pain as it can sometimes be difficult to tell whether they are making good contact with the membrane. However, it's still worth checking that there are no breaks between the contacts and the ICs on the PCB.

Also, if you've got an A5000 keyboard, I believe these use the same internals.

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