Weird Apple IIe (non-platinum) keyboard issue

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i've had apple iie (non-platinum 1984 edition beige keyboard) that's worked great since obtained several months ago. don't turn on bought excellent condition keyboard replace 1 in since had couple of broken key studs.

after replacing keyboard , turning on, keys seem stick...actually of keys stick. hooking old broken keyboard know works gives same result (keys sticking). running self-test (ctrl+open apple+closed apple+reset) gives system ok. i've reseated keyboard controller ic nothing has made difference. i've taken out of expansion cards (e.g. 64k ram card, disk controller card) out nothing made difference.

ideas causing out of blue? apple ii forums hard find i'm hoping there still folks around on site still vintage troubleshooting.
 

have tried posting on atariage in classic computing section? there few apple people there out.
 


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