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**rprosperi** · (This post was last modified: 09-17-2019 06:50 PM by rprosperi.)

I have a 71B that did the 'chirp on every key-press' but I do not recall it doing the other kinds of chirping you describe (though I did not try to write and run programs while in that state). I tried many things to identify the cause, but eventually gave up with no success. I put it aside for a couple weeks with no batteries installed and when I next tried it, it was fine, behaving normally with no chirping at all, and it has remained OK ever since.

So, in that case at least, it seemed to be some kind of very confused hardware state, only resolved by very deep power drain of electronics. It is indeed odd that it took so long as I had tried shorting the terminals, removing batteries overnight, etc. with no success, and we also know that unlike the 41C, the 71B is quite sensitive to battery removal, typically getting a ML after even extremely brief removal.

Can't hurt to give it try - let it sit while at HHC?