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Old 24 January 2016, 10:42   #1
cyberfox_it
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Amiga 2000 keyboard repair

Hello,

I've a problem with my amiga 2000 keyboard, inside there's a mitsumi board.

The problem is the left amiga key, that as you can see in the photo doesn't look as the other keys.

Anyone as had a problem like mine ? How can I repair it ?

Thank you very much
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Old 24 January 2016, 11:52   #2
Turran
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Seems to have worn off the graphite. You can repair it with something like this

http://www.ebay.com/itm/REMOTE-CONTR...3D231806205918

Its quite easy to overdo it though and put too much on. Practice on something else first so it does not flow out too much or build too high. Takes a while for it to harden though so you have time to clean it up if you make a mistake.

Clean pads, apply a little liquid graphite on it. Let it dry, done!

Last edited by Turran; 24 January 2016 at 12:07.
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Old 24 January 2016, 15:56   #3
cyberfox_it
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Quote:
Originally Posted by Turran View Post
Seems to have worn off the graphite. You can repair it with something like this

http://www.ebay.com/itm/REMOTE-CONTR...3D231806205918

Its quite easy to overdo it though and put too much on. Practice on something else first so it does not flow out too much or build too high. Takes a while for it to harden though so you have time to clean it up if you make a mistake.

Clean pads, apply a little liquid graphite on it. Let it dry, done!
Thank you very much for your advice, have you already tried ?
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Old 24 January 2016, 17:28   #4
idrougge
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You can try a short-term fix by overwriting the worn pads with a pencil first.
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Old 25 January 2016, 18:01   #5
Turran
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Quote:
Originally Posted by cyberfox_it View Post
Thank you very much for your advice, have you already tried ?

Yeah, I've used it on A4000 keyboards. Works a treat =)
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Old 25 January 2016, 18:24   #6
jbenam
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Yeah, I've used it on A4000 keyboards. Works a treat =)
Thanks for the link! I think my A4000's KB will need a bit of it as well, one of the two SHIFT keys isn't working anymore
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Old 25 January 2016, 22:18   #7
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I tried to repair my German A4000 keyboard with graphite the other day. I used this stuff here, but it didn't work for me at all.

In my case, the membrane wasn't the culprit, but a few of the key stamps had extremely high resistance values when measured with a multimeter. Can't remember off the top of my head, but somewhere in the few kOhm range. The working ones were something like 300-400 Ohms.

I tried many variations, and it didn't matter how much or how little graphite I applied to the key stamps, the conductivity didn't improve. Therefore, I really wonder why this method supposedly worked for so many other people. I ended up buying a few replacement key stamps and now my keyboard is working great again.

Maybe graphite works better for the membrane, but at least for the key stamps, it is not a perfect solution in my experience.
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Old 25 January 2016, 23:43   #8
zipper
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Depends of the graphite source, how pure it is.
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Old 26 January 2016, 10:11   #9
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Use the paper trick on the rubber conductors under the key stems instead graphite.
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Old 26 January 2016, 17:00   #10
idrougge
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Paper trick?
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Old 26 January 2016, 19:56   #11
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Take some ordinary copier paper and wipe any shiny rubber contacts with the paper until they are dull again.

Clean any dust with q-tips and iso alcohol and reassemble.

Mess free, restores them to as new condition.

Doesn't help it when some friend has taken sandpaper to the PCB as in the picture above, but there you can try the liquid graphite trick.
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Old 06 February 2016, 22:10   #12
cyberfox_it
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I've not used any sandpaper, the contacts on the pcb was white instead of black, I removed the most with my finger, but there's some remains as you see in the picture.

I'll try to clean it with alchool, and to apply the graphite...

Quote:
Originally Posted by Jope View Post
Take some ordinary copier paper and wipe any shiny rubber contacts with the paper until they are dull again.

Clean any dust with q-tips and iso alcohol and reassemble.

Mess free, restores them to as new condition.

Doesn't help it when some friend has taken sandpaper to the PCB as in the picture above, but there you can try the liquid graphite trick.
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