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HP 30b Mode Settings
04-14-2019, 06:22 PM
Post: #1
HP 30b Mode Settings
I have found that my HP 30b will not stay on the settings that I choose in the mode menu. I prefer RPN. Oddly, the only settings that undesirably change is RPN will change to chain, and radian will go to degrees. Is there a way to keep the mode settings from changing?
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04-15-2019, 01:32 AM (This post was last modified: 04-15-2019 01:35 AM by Joe Horn.)
Post: #2
RE: HP 30b Mode Settings
That's strange; those modes are supposed to persist. If they don't, I'd suspect it's either operator error (e.g. not changing the modes correctly) or a hardware problem (I'd guess either a low battery or a flaky connection somewhere, such as the battery contacts).

Let's rule out operator error: After pressing MODE, then pressing either arrow key 5 times to get to the RPN option, then pressing INPUT to rotate RPN into view, you should press the ON key to exit that menu and carve your RPN choice into stone. If you're doing that, and you still lose RPN mode, try changing the battery and/or cleaning the battery terminals.

Needless to say, resetting memory clears RPN mode. But I won't mention that, because it's needless to say.

EDIT: Oh! It just struck me! Do you have a program in memory which changes the modes? <Sorry, I should have thought of that first.>

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04-15-2019, 04:29 AM
Post: #3
RE: HP 30b Mode Settings
Hi Joe,

I am not running the program or two that is in the calculator. I just changed the batteries, just in case. I rotated the RPN choice into view again, just in case, after putting in the new batteries. Hopefully, this will solve the problem.

Do you know where to find a bug listing for this calculator? I remember seeing some comments on the old forum from accounting class professors that referred to some bugs (that to them, was a deal breaker in recommending the calculator to students). I have not encountered bugs...did encounter a bad error in a tutorial segment that HP had on the web...the calculator was correct, tutorial incorrect! I do not use the 30b for programming as it is rather cumbersome to do so, especially if I wished to utilize a function that required figuring out how many inputs or down arrows were necessary to choose the function in question!

The HP 30b is a handy calculator, and is one of the last to give RPN as an option.
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04-15-2019, 11:10 PM
Post: #4
RE: HP 30b Mode Settings
My HP20B behaves like your HP30b. I set the Fix mode to 11 digits and when I turn on the calculator, the setting is lost and starts again with Fix=2. The same for the RPN/CHAIN/ALGEBRAIC mode.

I have not tried to change batteries as no annunciator of low battery appeared.

My calcs: HP12C, HP15C, HP17BII+, HP20S, HP20B, HP32SII, HP34C, HP35S, HP42S, HP48GX.
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04-16-2019, 02:21 AM
Post: #5
RE: HP 30b Mode Settings
Hmmm... Does anybody know if the 20b and/or 30b are known to misbehave due to low power BEFORE the low-battery annunciator comes on? Losing settings like this should not happen.

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