HP Forum Archive 13

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11C Problems Message #1 Posted by John Rodriguez on 6 Nov 2003, 8:59 p.m. Anybody have an idea how to fix my beloved 11C? (Actually, my beloved's beloved 11C; I have a 15C.) Here's the scoop: 1. Calculator turns on by pressing any of these keys: ON, f, g, STO, RCL. 2. When f is pushed with calculator on, "f" does not appear in the display. None of the f functions work, i.e., I cannot change from SCI to ENG. "g", however, does appear in the display when g is pressed, and g functions correctly, i.e., I can change RAD to GRAD. 3. No multi-digit number can be entered. If you try to enter 45, first 4.0000 will appear, then 5.0000 will appear. 4. All functions seem to be working, meaning multiplication, addition, subtraction, CHS, exp(x), sin, and so on. Calculator fails the +, x, / tests with Error 9. Thanks for any advice!

Re: 11C Problems Message #2 Posted by Karl Schneider on 7 Nov 2003, 1:48 a.m., in response to message #1 by John Rodriguez John -- The 15C manual says simply that, if "Error 9" is obtained for the self-test, the calculator requires service. However, it also says that if the user wants to continue using the calc, a memory reset (ON/-) should be done.

Re: 11C Problems Message #3 Posted by Renato on 7 Nov 2003, 2:49 p.m., in response to message #1 by John Rodriguez IŽd start by doing a memory reset (ON - Minus). Then I would try a keyboard test (ON - Divide) Maybe changing batteries would help also. Good luck, Renato

Re: 11C Problems Message #4 Posted by David Smith on 7 Nov 2003, 3:17 p.m., in response to message #1 by John Rodriguez The ultimate HP10/11/12/15/16 reset is to short across the outside of the battery string for a second or so with a wire or paper clip while the batteries are in the machine (and YES it says this in the manual). Another very likely problem is some kind of internal short or (often invisible) contamination on the circuit board. Clean it well with 91%+ isopropyl alcohol. Keep it off the display window or you will get a white stain.

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