Keyboard ribbon cable issue

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KarateEd
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Keyboard ribbon cable issue

Post by KarateEd » Sat Nov 17, 2018 3:05 am

Hi folks,

Got the CMOS issue sorted but now I have a ribbon cable issue. I think with all the taking apart and putting together of the A3010, I've ended up wearing off some of the conduit of the ribbon cable for the keyboard.

I've put a picture up of it and was wondering what the best way to fix this would be?

Thanks for any help.....
Stripped keyboard cable.jpg
Edit: Keys that seem to be not working are as follows:
ESC, ;, bn/, CAPs LOCK, Space Bar
Keypad - 7,8,9,0, ENTER

Don't know if that's a pattern but something has gone amiss during my tear down and build up. The good news is the CMOS is fully working now.
Last edited by KarateEd on Sat Nov 17, 2018 4:31 am, edited 1 time in total.
Ed...... :-)

3 working Beebs, 1 RetroClinic Master, 1 normal Master, 1 A3010, 1 Pi2 RISC OS, 2 broken Beeb Motherboards, 1 Omnibus A7000+ server, 1 A7000+ Desktop, 1 PET, 1 C64, 1 C128, 1 Amiga 500 and 1 Roamer.

cmorley
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Re: Keyboard ribbon cable issue

Post by cmorley » Sat Nov 17, 2018 6:32 am

Nickel paint, patience and great care. :)

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KarateEd
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Re: Keyboard ribbon cable issue

Post by KarateEd » Sat Nov 17, 2018 5:40 pm

cmorley wrote:
Sat Nov 17, 2018 6:32 am
Nickel paint, patience and great care. :)
Will it stick to that black stuff or will I have to scrape something off?

Thanks in advance,
Ed...... :-)

3 working Beebs, 1 RetroClinic Master, 1 normal Master, 1 A3010, 1 Pi2 RISC OS, 2 broken Beeb Motherboards, 1 Omnibus A7000+ server, 1 A7000+ Desktop, 1 PET, 1 C64, 1 C128, 1 Amiga 500 and 1 Roamer.

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Re: Keyboard ribbon cable issue

Post by cmorley » Sat Nov 17, 2018 6:45 pm

The black stuff is carbon. It will stick to that & make a connection. WHere you've worn through to bare plastic you can roughen the surface a little to help the paint stick. It is fragile after application so you may need to re-apply if you insert/remove the flexi.

I have one of these:
https://uk.rs-online.com/web/p/electron ... s/1247676/

Don't bother with cheap stuff from eBay it is useless.

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KarateEd
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Re: Keyboard ribbon cable issue

Post by KarateEd » Sat Nov 17, 2018 7:09 pm

cmorley wrote:
Sat Nov 17, 2018 6:45 pm
The black stuff is carbon. It will stick to that & make a connection. WHere you've worn through to bare plastic you can roughen the surface a little to help the paint stick. It is fragile after application so you may need to re-apply if you insert/remove the flexi.

I have one of these:
https://uk.rs-online.com/web/p/electron ... s/1247676/

Don't bother with cheap stuff from eBay it is useless.
Yes, after posting, I found the A3000 thread on this so will give it a try. I can't make it worse anyway and if I get it fixed the way I want it then I shouldn't have to remove the keyboard again. It's pretty much a solid system with that fixed.
Ed...... :-)

3 working Beebs, 1 RetroClinic Master, 1 normal Master, 1 A3010, 1 Pi2 RISC OS, 2 broken Beeb Motherboards, 1 Omnibus A7000+ server, 1 A7000+ Desktop, 1 PET, 1 C64, 1 C128, 1 Amiga 500 and 1 Roamer.

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KarateEd
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Re: Keyboard ribbon cable issue

Post by KarateEd » Sat Nov 24, 2018 5:50 am

I got some nickel 'paste' and used painters tape to isolate the track and then used a Q-tip to apply the stuff.

I'll let it sit for 2 days before reconnecting the keyboard to the machine and see what happens. Wish me luck!

They say it's dangerous, ah well, what's life without a little danger......

Ed...... :-)
Nickel plating added.jpg
Last edited by KarateEd on Sat Nov 24, 2018 5:53 am, edited 1 time in total.
Ed...... :-)

3 working Beebs, 1 RetroClinic Master, 1 normal Master, 1 A3010, 1 Pi2 RISC OS, 2 broken Beeb Motherboards, 1 Omnibus A7000+ server, 1 A7000+ Desktop, 1 PET, 1 C64, 1 C128, 1 Amiga 500 and 1 Roamer.

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Re: Keyboard ribbon cable issue

Post by 1024MAK » Sat Nov 24, 2018 6:48 am

Well conducted (I hope) :D

Mark

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KarateEd
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Re: Keyboard ribbon cable issue

Post by KarateEd » Sat Nov 24, 2018 7:24 pm

1024MAK wrote:
Sat Nov 24, 2018 6:48 am
Well conducted (I hope) :D

Mark
Well, we'll find out tomorrow today if it is.....and that's how it's advertised.
Silver stuff.jpg
Fixed.jpg
I have tested all the keys that didn't work including the keypad keys and that little bit of missing conduit was the problem causing all that mayhem.

Essentially, what I have is a fully working system that holds it's CMOS settings and all keys work......a bit of a process but yeh, it's worth it to keep it working.
Last edited by KarateEd on Sat Nov 24, 2018 10:55 pm, edited 5 times in total.
Ed...... :-)

3 working Beebs, 1 RetroClinic Master, 1 normal Master, 1 A3010, 1 Pi2 RISC OS, 2 broken Beeb Motherboards, 1 Omnibus A7000+ server, 1 A7000+ Desktop, 1 PET, 1 C64, 1 C128, 1 Amiga 500 and 1 Roamer.

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Re: Keyboard ribbon cable issue

Post by klintworth » Sat Nov 24, 2018 11:05 pm

Nicely done, Ed! :D
BBC B Issue 4 & 7, BBC B (USA), BBC Master, Electron, BBC Master Compact, Olivetti PC128S, Castle A7000+, A3020, Valiant Turtle (sans IR Communicator!)

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KarateEd
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Re: Keyboard ribbon cable issue

Post by KarateEd » Sun Nov 25, 2018 1:38 am

klintworth wrote:
Sat Nov 24, 2018 11:05 pm
Nicely done, Ed! :D
Thanks Paul
Ed...... :-)

3 working Beebs, 1 RetroClinic Master, 1 normal Master, 1 A3010, 1 Pi2 RISC OS, 2 broken Beeb Motherboards, 1 Omnibus A7000+ server, 1 A7000+ Desktop, 1 PET, 1 C64, 1 C128, 1 Amiga 500 and 1 Roamer.

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Re: Keyboard ribbon cable issue

Post by RetroBob » Wed Feb 12, 2020 8:55 pm

Rather than start a new thread I found this one, might have similar issue and wanted to get advice from those more experienced than me!

So... after doing a bit work in my A3000 (bit of cleaning out dust/fluff with canned air, installing IDE Podule etc), some of the key have stopped working, they are...

Image

That's too much in an order for my liking so I suspected they are all linked. I looked at the ribbon and found there's a gap in the black (please excuse lack of proper terms).

So, I also looked at the ribbon, there's a mark.

Image

I took the keyboard out, more fluff and dust and found they seem to be along one of these tracks.

Image

Is my first port of call here to use one of these pens? https://uk.rs-online.com/web/p/electron ... s/1247676/.

There's also a bit of white stuff, not sure what that is. Should I give this whole thing a clean? If yes, what with?

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Re: Keyboard ribbon cable issue

Post by philpem » Mon Jun 08, 2020 10:47 am

I've just repaired an A3000 which had the characteristic dark LEDs.

Electrolube SCP (silver conductive paint) works brilliantly for this. It's about £15 from Rapid, for a 3ml bottle. You don't need a lot of it. Order a few fine-tip brushes at the same time (if Rapid don't have them, Amazon or an arts and crafts shop will).

Disassemble the keyboard - it clips together. Remove the membrane. You need to apply silver paint to the contact area where the LEDs go -- the power and disc LEDs in the top right, the scroll lock LED to the left of that, and the Caps Lock LED in the bottom left.

Using masking tape on the keyboard part of the membrane is (in my experience) a bad idea. It pulls the layers together and will draw the paint between the layers if you go too close to the edge.

Isopropyl works great for cleaning the brush afterwards.

The same trick also works for repairing worn spots on the keyboard ribbon at the contact end.

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