A1200 keyboard adventures

[Amigaz]

I am currently in the works of servicing an Amiga 1200 but I have ran into some issues with the keyboard.

Caps lock is dead, some keys need to be pressed very hard to register.
I have taken the keyboard appart and cleaned the membrane (was slighty dusty), plungers (with soapy water) and keycaps.
I have also cleaned the connector on the keyboard and the end othe membrane flat cable that goes into the motherboard connector.
The cleaning helped a but, some keys now work better but you still ned to step on some for them to register.

I've haquite alot of Amiga computers during the years but no keyboard has behaved like this, is there a chance the end of the plungers are worned out somehow on some of them so they make bad contact? I mean if the membrane was broken it shouldn't work at all?

[Boing-ball]

I am currently in the works of servicing an Amiga 1200 but I have ran into some issues with the keyboard.

Caps lock is dead, some keys need to be pressed very hard to register.
I have taken the keyboard appart and cleaned the membrane (was slighty dusty), plungers (with soapy water) and keycaps.
I have also cleaned the connector on the keyboard and the end othe membrane flat cable that goes into the motherboard connector.
The cleaning helped a but, some keys now work better but you still ned to step on some for them to register.

I've haquite alot of Amiga computers during the years but no keyboard has behaved like this, is there a chance the end of the plungers are worned out somehow on some of them so they make bad contact? I mean if the membrane was broken it shouldn't work at all?

Not much to a A1200 keyboard as the Keyboard controller is housed on the motherboard unlike the A500 ones.
Ideally you need to clean the keyboard plunger rubbers with a Piece of plain paper. Hot soapy water ain’t going to sort it. The rubbers are a conductive graphite. The membrane can suffer partial failure, but you will notice certain keys not responding whilst others will function. Plenty of replacement Keyboard membranes for sale on EBay. Make sure you get the right one though. Different types on certain A1200. Most common was the Mitsumi.

[Amigaz]

Not much to a A1200 keyboard as the Keyboard controller is housed on the motherboard unlike the A500 ones.
Ideally you need to clean the keyboard plunger rubbers with a Piece of plain paper. Hot soapy water ain’t going to sort it. The rubbers are a conductive graphite. The membrane can suffer partial failure, but you will notice certain keys not responding whilst others will function. Plenty of replacement Keyboard membranes for sale on EBay. Make sure you get the right one though. Different types on certain A1200. Most common was the Mitsumi.

I see, so maybe a go through with a q-tip with IPA on and clean all of the ... "rubbers" then?

[Boing-ball]

Noooooo! You’ll might make it worse! Just try rubbing a plain piece of paper. Think of these like the same substance you find in a HB pencil. You will notice black markings when rubbing. This is normal.