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HP-21 malfunction
11-14-2019, 02:40 PM (This post was last modified: 11-14-2019 02:41 PM by Moggul.)
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HP-21 malfunction
I recently acquired an HP-21 and am trying to resurrect it.

The battery pack was in very bad shape so when connected to the charger the display was erratic, showing a flickering 0 in the rightmost digit. After installing fresh rechargeable batteries the display showed a single strong 0, and now it shows all 0s without any flickering (see pic sequence). This is both when connected to the charger and when powered by the batteries alone.


Is the calculator resurrectable or should I go the Panamatik route?


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Messages In This Thread
HP-21 malfunction - Moggul - 11-14-2019 02:40 PM
RE: HP-21 malfunction - Harald - 11-14-2019, 03:10 PM
RE: HP-21 malfunction - Steve Simpkin - 11-14-2019, 03:49 PM
RE: HP-21 malfunction - ignazio - 11-15-2019, 12:09 PM

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