I've seen a few articles on keyboard issues on the IIc but none that match the issue that I'm experiencing.
I have a IIc in good condition. Upon power up I get the usual "Check disk drive" message or, if a disk is in the drive, the disk loads. It is a UK model ROM 255 variant, so not the Alps keyboard.
In the first scenario above if I drop to the BASIC prompt by CTRL-reboot, I get a continuous stream of space characters that eventually hits the end of the line buffer, beeps and starts doing the sames on a new line. Pressing any of the other chacter keys (letters, numbers, punctuation) don't seem to do anythind, but I can soft and hard reset it using the CTRL, open Apple and rest key combinations. If I toggle the keyboard button then the space character changes to an "I" but pressing any character key doesn't chnage this. However, keys such as CTRL and shhift display other letters (can't remember what exactly shift displays but something like a "G").
If I boot off a disk (for example Apple Adventure!), once loaded I get the same problem - a constant stream of space characters.
From reading around the forum and other sites, this is possible as simple as a broken key switch or more serious. How could I check the keyswicth armed only with a multimeter with continuity function? The keyswitch has four contacts, two diagonally oppostie the other, but I'm not sure why four are needed, so don't know how to see if the switch is broken.
Can anyone help shed some light on what the issue may be and how I can start eliminating potential issues? I class myself as 'dangerous' with a soldering iron, but basic tests I can probably handle.
As an aside, can anyone recommend UK-based companies/people who can offer repairs (as I can see this might eventually be what's needed), but my usual go-to person up in Tynemouth is now doing less repairs and more retro development.
Any pointers gratefully accepted.