Weird HP-71B behavior...

[KF6GPE]

Thanks to both of you! I think disassembly may be my next step. Joe, I did try shorting the battery contacts at first, did it again this morning, no luck either time. It's unresponsive to on-/. What's kind of goofy is after shorting the battery contacts for a minute or so and putting it back together it won't power on with the batteries, but does on an AC charger --- back to the last result ('33', I kind of wish it was '42') in calc mode and doesn't respond. Very weird. That leads me to believe I'm not fully draining the back-up cap, because I know these things don't have NVRAM or anything. (And oh, yeah, no modules in any port.)

Thanks! Will update here when I get a chance to get it on a bench if I find anything interesting.

R.