Solution to A600 (maybe 1200?) keyboard cable problem

Akira · 15 March 2010, 21:01

First of all, if this has ben posted before, sorry, I didn't find it with the search function. Since it's a very common problem I thought it was worth making a thread about it.

Anyway, my A600 is alive and kicking again!
After taking it to an electronic repair shop (that took a sweet month and a half to replace all but two caps because he was lazy) it's back into action like always!

When plugged in, however, I realized the keyboard doesn't work at all. The bloody ribbon, which was playing hard to use, just stopped working completely. How fucking annoying. I have an extra membrane but for the A1200.

So, my brute force solution: I cut about 7mm (or more) worth of the tip, then gently scratched the conducting traces with a scalpel (or scissors or whatever you want) to expose the metal. To my surprise, it worked perfectly.

Here's a pic of how it looks like:

Of course, you can do this more elegantly, I bet :P

I am very happy to have the A600 running again. It's been with me for 7 years already

Is this method good for the A1200 too?
I hope it helps someone with their keyboard problems.

Bloodwych · 15 March 2010, 21:13

It's great to see your name popping up from time to time on EAB buddy!

So pleased you've got your A600 working again. You know what I'm going to mention now don't you? Your A600 Workbench you never got around to completeing!

So, now it's back in action - do you have a hard drive for it? Or are you thinking of upgrading it with a CF card?

Looks in great condition. Two months for cap replacement is pretty bad. Perhaps time to get a soldering iron and have a go yourself.

Akira · 16 March 2010, 04:33

Hi man!
After using this A600 all day today I can say I am amazed I ever worked in such a slow environment :P I guess I Am spoiled by my 030 A1200! So I don't know how much of a reason would exist behind making an A600 workbench install.

Anyway, it looks better in pics than IRL, it's quite yellowed. But it's been my Amiga since 1993 and I deeply apreciate that.

The machine has a hard drive that still spins to life (incredible!), and I got a CF adapter for it but all it does is lock up the machine. I wonder if it is the adapter or the card... I did try with another card, same results (a hum on the screen)

Also, and this is weird, when the machine has no hard drive activity, I can see a hum onscreen, like a refresh bar or something. When it reads the HD, it goes away. Maybe oneof the caps is not of the exact same type?

Akira · 03 December 2010, 15:43

Seems like the original pic got missing. I will fix this soon.

corpsicle · 24 April 2012, 08:28

Sorry for reanimating such an old thread.
But i got an a1200 with this keyboard problem.
And since i already ordered a new keyboard im gonna take the risk and try this fix on the old one.
Will report later how it worked. =)

Akira · 24 April 2012, 11:47

Cool. It's always worked for me! But I should add to this post a disclaimer: if you break your Amiga while performing this, for example by scratching too much, i ain't responsible :P

roy bates · 24 April 2012, 15:34

ive done this myself on a few amigas,it works well!

it also works on spectrum keybaords.

Akira · 24 April 2012, 17:09

Nice to hear! I guess it would work on any flat ribbon type contact that goes bad/eroded/rusty.

BarryB · 24 April 2012, 22:19

I had this happen on my A1200, posted another fix in another thread but can't remember where. Anyway, what I did was to cut about 10mm of the end of the flat cable then with the edge of scalpel you can gently lift up the green film from the corner and peel it back to expose the contacts, then you can slice off the green film once you've peeled back enough. Just make sure the exposed contacts are long enough to slide back into the keyboard connector on the board.

corpsicle · 26 April 2012, 08:53

Ok.

I cut off approx 7mm off the end.
Peeled the green film and scratched a little bit for good measure.
Plugged it in, and i had the _exact_ same buttons not work. o_O
How is that even possible ?

I was just about to give up, but figured what the hell and just sprayed some IPA in there and rubbed a bit with a toothbrush.
Plugged the keyboard back in, and this time everything works fine. =D
So i cant really confirm if it was this fix that worked, or if it was the 10th cleanup or so that finally did it.

Either way it works now and i have a brand new replacement keyboard coming in the mail too. ^_^

mancity · 03 May 2012, 09:13

I have tried this on my 1200 keyboard and having a couple of problems...

The end of the ribbon cable is like a stuck-on green section of about 5cm in length. I peeled this off and cut about 10mm of the ribbon cable with the aim of then exposing the wiring within it at the end, and then re-connecting the green plastic section to give it thickness when it back into the keyboard clip.

However, I cannot expose the wiring on the ribbon cable at all? I am going to try scraping it with a stanley knife tonight but I highly doubt there will be any success.

BarryB · 04 May 2012, 23:36

@corpsicle: You may have had some debris lodged in the keyboard connector on the board, repeated insertions might have dislodged it or compacted it so it wasn't causing a problem anymore, just a guess!!

alenppc · 04 May 2012, 23:45

Someone correct me if I am wrong, but only the very bottom of the cable is conductive, which is why you should never cut off more than 1-2 mm at most. I don't think you can expose the contacts within the flat cable itself, although the damaged ones can be reinforced with conductive paint.

If there is a way to expose the contacts from within the flat ribbon cable, then I may have a chance of recovering my blue membrane A600 keyboard as well.

prowler · 05 May 2012, 00:03

Quote:

Originally Posted by mancity

However, I cannot expose the wiring on the ribbon cable at all? I am going to try scraping it with a stanley knife tonight but I highly doubt there will be any success.

If you start this task with that attitude, you are almost guaranteed to fail!

Think positive, take your time and be very, very gentle and you should succeed.

Make sure the blade is either new or hardly used, so that the edge is undamaged.

Work on the cable with it resting on a flat, hard surface and secure it with a piece of wood and G-cramps if possible, or get someone else to press down firmly on the wood to hold it steady.

IMHO, you would be better off using just the blade without the handle and starting with the blade resting on the cable so that it is parallel to it with the edge at the point from which you wish to start stripping the insulation, then gently lift it so that the chamfer of the blade rests parallel with the cable and then lift it a bit more and then carefully pare away a very thin layer as wide as the blade right to the edge. You will have to repeat this a number of times until the insulation is stripped right down to the conductors across the full width of the cable.

Good luck!

ramparts · 05 May 2012, 00:18

i would not recomended to cut the cable but pencil graphite would do very good contact
i think should cut as if you cut any of the traces would eventually brake later,well that is my opinion

regards Gonçalves portuguese amiga comunity

FOL · 05 May 2012, 12:02

Quote:

Originally Posted by ramparts

i would not recomended to cut the cable but pencil graphite would do very good contact
i think should cut as if you cut any of the traces would eventually brake later,well that is my opinion

regards Gonçalves portuguese amiga comunity

The problem is, its hard to get pencils that have conductive elements.

Retrofan · 05 May 2012, 12:18

You can try with Graphit 33, but it hasn't given me very good results.

spanner · 08 July 2012, 00:35

Make sure you just take off the plaste coating only so don't scrape to hard on the ribbon. or you will have to get a new keyboard.I will have too do this with mine,I did it once before and messed it up and had to get a new keyboard

spanner · 08 July 2012, 16:46

Is there any differents beteen the A600 ribbon and the A1200 ribbon,..?

Commodore should of kept the way the A500 keyboard is,its not a ribbon..

roy bates · 09 July 2012, 00:21

Quote:

Originally Posted by spanner

Is there any differents beteen the A600 ribbon and the A1200 ribbon,..?

nope.

15 March 2010, 21:01	#1
Akira Registered User Join Date: May 2001 Location: # Posts: 12,593	Solution to A600 (maybe 1200?) keyboard cable problem First of all, if this has ben posted before, sorry, I didn't find it with the search function. Since it's a very common problem I thought it was worth making a thread about it. Anyway, my A600 is alive and kicking again! After taking it to an electronic repair shop (that took a sweet month and a half to replace all but two caps because he was lazy) it's back into action like always! When plugged in, however, I realized the keyboard doesn't work at all. The bloody ribbon, which was playing hard to use, just stopped working completely. How fucking annoying. I have an extra membrane but for the A1200. So, my brute force solution: I cut about 7mm (or more) worth of the tip, then gently scratched the conducting traces with a scalpel (or scissors or whatever you want) to expose the metal. To my surprise, it worked perfectly. Here's a pic of how it looks like: Of course, you can do this more elegantly, I bet :P I am very happy to have the A600 running again. It's been with me for 7 years already Is this method good for the A1200 too? I hope it helps someone with their keyboard problems. Last edited by Akira; 03 December 2010 at 15:46.

15 March 2010, 21:13	#2
Bloodwych Moderator Join Date: Jun 2001 Location: I'm behind you! Posts: 3,699	It's great to see your name popping up from time to time on EAB buddy! So pleased you've got your A600 working again. You know what I'm going to mention now don't you? Your A600 Workbench you never got around to completeing! So, now it's back in action - do you have a hard drive for it? Or are you thinking of upgrading it with a CF card? Looks in great condition. Two months for cap replacement is pretty bad. Perhaps time to get a soldering iron and have a go yourself. __________________ Live Long and Procrastinate A500 Batman Pack Classic Workbench

05 May 2012, 12:18	#17
Retrofan Ruler of the Universe Join Date: Mar 2010 Location: Lanzarote/Spain Posts: 2,737	You can try with Graphit 33, but it hasn't given me very good results. __________________ AmiKit for Real Amigas Released, Click Here A1200 1D1, 8Gb SSD Hd, ACA 1231/42. A1200 2B, Lateral slot for Cf Hd's, Tray system Dvd. ACA1230/56, Fast Ata MKII, Indivision MkII with Hdmi. A1200 1D1, Lateral slot for Cf Hd's, Tray system Dvd, Clockport expander, Delfina, Subway, IDefix, BPPC, BVision, Acard with lateral slot for Scsi Cf HD... C=64 with ITX inside. Posting with it. Last edited by Retrofan; 05 May 2012 at 12:27.

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16 March 2010, 04:33	#3
Akira Registered User Join Date: May 2001 Location: # Posts: 12,593	Hi man! After using this A600 all day today I can say I am amazed I ever worked in such a slow environment :P I guess I Am spoiled by my 030 A1200! So I don't know how much of a reason would exist behind making an A600 workbench install. Anyway, it looks better in pics than IRL, it's quite yellowed. But it's been my Amiga since 1993 and I deeply apreciate that. The machine has a hard drive that still spins to life (incredible!), and I got a CF adapter for it but all it does is lock up the machine. I wonder if it is the adapter or the card... I did try with another card, same results (a hum on the screen) Also, and this is weird, when the machine has no hard drive activity, I can see a hum onscreen, like a refresh bar or something. When it reads the HD, it goes away. Maybe oneof the caps is not of the exact same type?

03 December 2010, 15:43	#4
Akira Registered User Join Date: May 2001 Location: # Posts: 12,593	Seems like the original pic got missing. I will fix this soon.

24 April 2012, 08:28	#5
corpsicle Registered User Join Date: Aug 2009 Location: Stockholm / Sweden Posts: 30	Sorry for reanimating such an old thread. But i got an a1200 with this keyboard problem. And since i already ordered a new keyboard im gonna take the risk and try this fix on the old one. Will report later how it worked. =)

24 April 2012, 11:47	#6
Akira Registered User Join Date: May 2001 Location: # Posts: 12,593	Cool. It's always worked for me! But I should add to this post a disclaimer: if you break your Amiga while performing this, for example by scratching too much, i ain't responsible :P

24 April 2012, 15:34	#7
roy bates Registered User Join Date: Apr 2011 Location: birmingham Age: 44 Posts: 2,068	ive done this myself on a few amigas,it works well! it also works on spectrum keybaords.

24 April 2012, 17:09	#8
Akira Registered User Join Date: May 2001 Location: # Posts: 12,593	Nice to hear! I guess it would work on any flat ribbon type contact that goes bad/eroded/rusty.

24 April 2012, 22:19	#9
BarryB Registered User Join Date: Dec 2009 Location: UK Posts: 476	I had this happen on my A1200, posted another fix in another thread but can't remember where. Anyway, what I did was to cut about 10mm of the end of the flat cable then with the edge of scalpel you can gently lift up the green film from the corner and peel it back to expose the contacts, then you can slice off the green film once you've peeled back enough. Just make sure the exposed contacts are long enough to slide back into the keyboard connector on the board.

26 April 2012, 08:53	#10
corpsicle Registered User Join Date: Aug 2009 Location: Stockholm / Sweden Posts: 30	Ok. I cut off approx 7mm off the end. Peeled the green film and scratched a little bit for good measure. Plugged it in, and i had the _exact_ same buttons not work. o_O How is that even possible ? I was just about to give up, but figured what the hell and just sprayed some IPA in there and rubbed a bit with a toothbrush. Plugged the keyboard back in, and this time everything works fine. =D So i cant really confirm if it was this fix that worked, or if it was the 10th cleanup or so that finally did it. Either way it works now and i have a brand new replacement keyboard coming in the mail too. ^_^

03 May 2012, 09:13	#11
mancity Registered User Join Date: Apr 2012 Location: Manchester Posts: 276	I have tried this on my 1200 keyboard and having a couple of problems... The end of the ribbon cable is like a stuck-on green section of about 5cm in length. I peeled this off and cut about 10mm of the ribbon cable with the aim of then exposing the wiring within it at the end, and then re-connecting the green plastic section to give it thickness when it back into the keyboard clip. However, I cannot expose the wiring on the ribbon cable at all? I am going to try scraping it with a stanley knife tonight but I highly doubt there will be any success.

04 May 2012, 23:36	#12
BarryB Registered User Join Date: Dec 2009 Location: UK Posts: 476	@corpsicle: You may have had some debris lodged in the keyboard connector on the board, repeated insertions might have dislodged it or compacted it so it wasn't causing a problem anymore, just a guess!!

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04 May 2012, 23:45	#13
alenppc Registered User Join Date: Apr 2012 Location: Montreal, Canada Age: 33 Posts: 162	Someone correct me if I am wrong, but only the very bottom of the cable is conductive, which is why you should never cut off more than 1-2 mm at most. I don't think you can expose the contacts within the flat cable itself, although the damaged ones can be reinforced with conductive paint. If there is a way to expose the contacts from within the flat ribbon cable, then I may have a chance of recovering my blue membrane A600 keyboard as well.

05 May 2012, 00:18	#15
ramparts Users Awaiting Email Confirmation Join Date: Apr 2011 Location: porto/portugal Posts: 35	i would not recomended to cut the cable but pencil graphite would do very good contact i think should cut as if you cut any of the traces would eventually brake later,well that is my opinion regards Gonçalves portuguese amiga comunity

08 July 2012, 00:35	#18
spanner Registered User Join Date: Jun 2012 Location: None Posts: 298	Make sure you just take off the plaste coating only so don't scrape to hard on the ribbon. or you will have to get a new keyboard.I will have too do this with mine,I did it once before and messed it up and had to get a new keyboard

08 July 2012, 16:46	#19
spanner Registered User Join Date: Jun 2012 Location: None Posts: 298	Is there any differents beteen the A600 ribbon and the A1200 ribbon,..? Commodore should of kept the way the A500 keyboard is,its not a ribbon..