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Ti-58c: Strange behavior
09-03-2019, 07:53 PM
Post: #4
RE: Ti-58c: Strange behavior
Here's a good thread about the TI58c.

Section 2.4.1 in the first post of this thread says that when the calculator is turned off the static RAM chip is powered by a 470uF electrolytic capacitor, and that this capacitor is kept charged via a germanium diode connected to the battery. Looking at the chip specs online gives a typical standby current of 0.2 uA. Without the diode to keep it charged, this current would drain the capacitor in a couple of hours, which is roughly what you are observing. I suggest that the electrolytic capacitor in your calculator is probably fine, but that the germanium diode keeping it charged might need replacement.

Nigel (UK)
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Messages In This Thread
Ti-58c: Strange behavior - Doctor_Jacek - 09-03-2019, 09:39 AM
RE: Ti-58c: Strange behavior - jlind - 09-03-2019, 03:29 PM
RE: Ti-58c: Strange behavior - Nigel (UK) - 09-03-2019 07:53 PM

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