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HP-35S uses up batteries in three days
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burk...@gmail.com
Apr 30, 2019, 11:21:56 PM4/30/19
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I have an HP-35S, and it is great. The only problem, which I didn't figure out until it was too late to return the machine, is that it uses up a set of batteries in about three days. Apparently, something is draining the batteries even when the machine is turned off.
Any thoughts or ideas? I really don't want to just buy another one.
--RJB
Any thoughts or ideas? I really don't want to just buy another one.
--RJB
Hic quondam locutus sum
May 8, 2019, 2:45:13 PM5/8/19
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2007, then I have no idea without a schematic. I think you'd get more answers if
you posted your question to the HP Museum forums : http://www.hpmuseum.org/
Regards,
Hic quondam locutus sum
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Hic quondam locutus sum
May 8, 2019, 2:56:16 PM5/8/19
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On Wed, 08 May 2019 13:45:10 -0500, Hic quondam locutus sum <nos...@nospam.com>
wrote:
>On Tue, 30 Apr 2019 20:21:54 -0700 (PDT), burk...@gmail.com wrote:
>
>>I have an HP-35S, and it is great. The only problem, which I didn't figure out until it was too late to return the machine, is that it uses up a set of batteries in about three days. Apparently, something is draining the batteries even when the machine is turned off.
>>
>>Any thoughts or ideas? I really don't want to just buy another one.
>>
>>--RJB
>
>If you're referring to the Kinpo manufactured HP-35S which was introduced in
>2007, then I have no idea without a schematic. I think you'd get more answers if
>you posted your question to the HP Museum forums : http://www.hpmuseum.org/
>
I found the following :
https://www.embedded.com/design/mcus-processors-and-socs/4007500/1/Tear-Down-Scientific-calculator-boils-design-down-to-two-ICs
. Maybe it would be of some help to you. You probably have a bad voltage
regulator or some supporting circuitry like a diode or capacitor that is
malfunctioning, but, I'm not all familiar with the HP-35S's internals, I
wouldn't know for sure.
wrote:
>On Tue, 30 Apr 2019 20:21:54 -0700 (PDT), burk...@gmail.com wrote:
>
>>I have an HP-35S, and it is great. The only problem, which I didn't figure out until it was too late to return the machine, is that it uses up a set of batteries in about three days. Apparently, something is draining the batteries even when the machine is turned off.
>>
>>Any thoughts or ideas? I really don't want to just buy another one.
>>
>>--RJB
>
>If you're referring to the Kinpo manufactured HP-35S which was introduced in
>2007, then I have no idea without a schematic. I think you'd get more answers if
>you posted your question to the HP Museum forums : http://www.hpmuseum.org/
>
https://www.embedded.com/design/mcus-processors-and-socs/4007500/1/Tear-Down-Scientific-calculator-boils-design-down-to-two-ICs
. Maybe it would be of some help to you. You probably have a bad voltage
regulator or some supporting circuitry like a diode or capacitor that is
malfunctioning, but, I'm not all familiar with the HP-35S's internals, I
wouldn't know for sure.
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