I purchased a IIe several months back and all was well except for the keyboard missing a couple of keys. I finally got my hands on an excellent quality replacement keyboard and I replaced the broken keyboard with the new one. I don't fire up the machine that much as I'm waiting on my CFFA3000 order to arrive before I dive in too much. Before I replaced the keyboard, the encoder/decoder (AY-5-3600-PRO) was functioning perfectly. After replacing the keyboard I powered on the IIe to make sure all keys on the keyboard functioned properly...which they did but to my dismay all of the keys repeated for a short amount of time. The IIe wasn't registering the key release quickly enough it seemed. I can get only one character for a key, but I have to be REALLY fast in pressing that key. I usually get 8-12 repeats of that character before it starts.
Oddly enough, the spacebar doesn't work either. The behavior exists for both of the keyboards I have (new one and the old one with broken key studs).
I've taken out the AY-5-3600-PRO with an extractor (even filed the contacts a little so new metal is showing) and reseated a couple of different times but it didn't make any difference. Everything is making it into the socket. For kicks I also reseated the IOU. The circuits on the main board are good as well (nothing has come lose under the decoder socket).
I figure this is a textbook example of a AY-5-3600-PRO in need of replacement but before I went to that trouble I figured I'd get a second opinion. The price of IIe's on eBay are astronomical at the moment else I would just get a POS one as a spare for this chip. A few months ago I could have gotten one for a song.
I do have a multi-meter laying around, but I'm not sure how I would go about verifying that the decoder is definitely bad.
FWIW, I did search around for a while to find a similar thread, but I didn't see one here or in the Apple II forum. Maybe one exists somewhere, but then again, I want confirmation for my issue independently anyway.