Re: problem with HP-48SX Message #3 Posted by Bucky on 10 Sept 2002, 11:44 a.m., in response to message #2 by Vieira, Luiz C. (Brazil)
Luiz,
When the calculator locks up, there is no blinking arrow cursor beside the "6". The problem is intermittant (it happened twice last week) and I was tempted to give the machine a very firm "rap" up against the opposite wall.
:-) When the machine locks up, and I resort to pulling the battery, it asks me if I want to try to restore memory. I say "yes". It has generally been able to retrieve some of the memory, but eventually returns me to the same screen with the "6" and locks up again. I've checked the batteries as you suggested, and they aren't leaking. I generally go through a set of Mallory Duracells every three months or so, so they stay fairly fresh.
When it locks up again, I will try the "rap" against the palm. Do you know of any way to safely crack the case and clean out the area under the keypad? Like you, I'm suspecting a keypad plaque problem or some other keypad related issue as the self-tests come back OK when the calculator is working.
Thank you for you efforts and suggestions.
--Bucky
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