killing Plus keyboard with proper cable?

[CharlieFrown]

Hi, 

Is it possible to damage Macintosh Plus keyboard chip with changing keyboards or/and cables while computer is on?

Today I tested my two M0110A keyboards with Plus and self made modified cables (none of them were regular phone cord).

One of my keyboards worked fine while using old version of Mac Paint in typing mode. Then I switched the keyboard while computer was working and now none of the keyboards work!

I tried different cable while the computer still on - nothing. Maybe I should clean the keys and metal pins that connect the cable. Any other things you would try guys?

BTW my analogue board had a toasted capacitor 0.47 uf 250v (x), which I replaced with 0.50 uf 250v, the only one they had in store, if it has anything to do with this issue. 

 

[Dog Cow]

Is it possible to damage Macintosh Plus keyboard chip with changing keyboards or/and cables while computer is on?

Maybe. Depends on if you believe in hot-plugging or not.

ADB is not supposed to be hot-plugged, but I've done it and had it work. But I've also ruined a Mac LC ADB port by hot-plugging. The keyboard port on a Mac 512K or Plus is probably not supposed to be hot-plugged either, but I've done it and had it work too. But maybe next time I try it, it will fry a keyboard or something on the motherboard.