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Help on HP28S
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01-25-2019, 12:51 AM
Post: #5
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RE: Help on HP28S
Sorry, but a big oops on the 12 volt battery insertion. Some 41c’s have suffered the same fate.
Having said that, the damage may have been limited to the power side of the circuit. Usually an electrolytic cap fries first. Now the problem is “is it worth it to disassemble a calculator not made for easy disassembly. Then track down the circuit in the hope the 36 volts did not make it to the ACT or any other IC’s. Find a working one on ebay with the knowledge that the battery cover and case design are problematic. Search clamshell battery cover issues and heat stake issues: Opening an HP28S |
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| Messages In This Thread |
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Help on HP28S - Cancuino - 01-24-2019, 08:56 PM
RE: Help on HP28S - John Keith - 01-24-2019, 09:15 PM
RE: Help on HP28S - Cancuino - 01-24-2019, 09:19 PM
RE: Help on HP28S - grsbanks - 01-24-2019, 09:26 PM
RE: Help on HP28S - mfleming - 01-25-2019, 02:07 AM
RE: Help on HP28S - Geoff Quickfall - 01-25-2019 12:51 AM
RE: Help on HP28S - jonese - 01-25-2019, 03:14 AM
RE: Help on HP28S - Jlouis - 01-25-2019, 03:26 AM
RE: Help on HP28S - Geoff Quickfall - 01-25-2019, 03:28 AM
RE: Help on HP28S - isanchez - 01-25-2019, 10:09 AM
RE: Help on HP28S - everettr - 01-25-2019, 05:50 PM
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