Author Topic: Only half a 464 Plus keyboard is working  (Read 864 times)

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Offline CrookieMonster

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Only half a 464 Plus keyboard is working
« on: 16:24, 04 December 19 »
I'm having yet another issue trying to bring my 464 Plus back to life.


I now have a cartridge with BASIC (thanks tjohnson for all of your help) but I'm now finding that a few of the keys on the keyboard are not working (from y to p, Return and some others.


Is there an easy method of working with keyboards to fix this? It's only affecting the right hand side of the keyboard.


Offline Bryce

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Re: Only half a 464 Plus keyboard is working
« Reply #1 on: 16:32, 04 December 19 »
First step would be to open it and clean the membrane. If that doesn't fix it, you need to work out whether it's a damaged membrane, dodgy AY chip or dodgy ASIC.

Bryce.
 

Offline Skunkfish

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Re: Only half a 464 Plus keyboard is working
« Reply #2 on: 16:34, 04 December 19 »

@CrookieMonster
I managed to resolve a longstanding issue with this on my 6128 Plus by cleaning the keyboard connector on the board with a piece of card as per 00WReX's suggestion in the thread linked below (thanks 00WReX by the way, I forgot to thank you in the other thread!)
http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/amstrad-6128-plus-keyboard-problem/msg177000/#msg177000
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Offline CrookieMonster

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Re: Only half a 464 Plus keyboard is working
« Reply #3 on: 16:45, 04 December 19 »
Thanks both. I'll give this a go. I've also noticed that the controller doesn't work on the 464 Plus but does work on a GX4000: does it sound like a more widespread issue?

Offline Bryce

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Re: Only half a 464 Plus keyboard is working
« Reply #4 on: 16:50, 04 December 19 »
If the Joystick or controller doesn't work, then it's more likely that the AY chip is damaged. Does it play any sound?

Bryce.

Offline mr_lou

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Re: Only half a 464 Plus keyboard is working
« Reply #5 on: 17:03, 04 December 19 »
@CrookieMonster
I managed to resolve a longstanding issue with this on my 6128 Plus by cleaning the keyboard connector on the board with a piece of card as per 00WReX's suggestion in the thread linked below (thanks 00WReX by the way, I forgot to thank you in the other thread!)
http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/amstrad-6128-plus-keyboard-problem/msg177000/#msg177000

Interesting. Have to try this on my CPCplus too.
Some keys wasn't working a while back, so I replaced the membrane with a new one. This worked, but not for long. The same keys are acting up again every now and then. Maybe this cardboard method will work.

Offline CrookieMonster

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Re: Only half a 464 Plus keyboard is working
« Reply #6 on: 17:35, 04 December 19 »
Yes, it does play sound.


If the Joystick or controller doesn't work, then it's more likely that the AY chip is damaged. Does it play any sound?

Bryce.

Offline Bryce

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Re: Only half a 464 Plus keyboard is working
« Reply #7 on: 09:43, 05 December 19 »
Ok. But the AY could still be the problem. Can you tell us exactly what keys don't work?

Bryce.

Offline CrookieMonster

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Re: Only half a 464 Plus keyboard is working
« Reply #8 on: 11:32, 05 December 19 »
@Bryce Its uiop jkl return and the | key. I don’t think the function keys work and the up and right arrow keys don’t either. Thanks so much for the help.  :)

Offline Bryce

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Re: Only half a 464 Plus keyboard is working
« Reply #9 on: 12:15, 05 December 19 »
Ok, then it's most likely just dirt on the membrane as those keys are physically clustered, but don't electrically share a common row or column (unless of course multiple rows/columns have failed).

Bryce.

Offline CrookieMonster

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Re: Only half a 464 Plus keyboard is working
« Reply #10 on: 19:40, 10 May 20 »
Apologies for the late reply. I’ve finally gotten around to taking a look. I’ve cleaned the membrane and the connector but the same keys still fail to work. Hmmm. Can’t figure it. There’s sound, the joystick ports are fine. Everything else appears to work as normal except these keys. Would it need a new membrane? Are they even available?

Offline CrookieMonster

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Re: Only half a 464 Plus keyboard is working
« Reply #11 on: 16:05, 26 May 20 »
I’m wondering if I’m not cleaning the membrane properly. What should I clean it with?


Apologies for the late reply. I’ve finally gotten around to taking a look. I’ve cleaned the membrane and the connector but the same keys still fail to work. Hmmm. Can’t figure it. There’s sound, the joystick ports are fine. Everything else appears to work as normal except these keys. Would it need a new membrane? Are they even available?

Offline Bryce

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Re: Only half a 464 Plus keyboard is working
« Reply #12 on: 16:09, 26 May 20 »
Warm water and soap. It could of course still be a crack in the membrane that's causing the problem.

Bryce.

Offline mark25810

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Re: Only half a 464 Plus keyboard is working
« Reply #13 on: 00:44, 10 June 20 »













when I got my 464 plus I noticed some of the F keys were not working, like F1 and another took it apart membrane was ok but was a tad loose at that side so used a bit of electrical tape just to stick it tight like the rest was and it sorted it right away
















I'm having yet another issue trying to bring my 464 Plus back to life.


I now have a cartridge with BASIC (thanks tjohnson for all of your help) but I'm now finding that a few of the keys on the keyboard are not working (from y to p, Return and some others.


Is there an easy method of working with keyboards to fix this? It's only affecting the right hand side of the keyboard.