Greetings, all: recently acquired 97, has fault as follows. Display seems normal, all numbers can be entered from keypad in usual way and they display correctly. But pressing "Enter" or any other key besides a number causes display to read "Error" and a tone to sound which cannot be removed except by powering down. I beg you to tell me this is not fatal, and would appreciate any hints on how to solve this problem. BTW, power supply is OK, machine does this even when operated on external power.
Thanks in advance for any help.
Mike T.
HP97 fault
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