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stopped working after wrong battery installed

Battery store installed too powerful a battery (somehow same size as N type so fit} in HP 41CV and it never worked again with N Type. Person said it was “fried” and gave a different model replacement.

Is it possible to fix or is it permanently damaged from overload.

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Hi,

It may be possible to fix it but looking at the start of the troubleshooting section in the service manual, you will need an ET-11966 service rom module and a port extender to start performing the tests to know what may be the problem.

I can’t find either online, you may have better luck

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Kevin Kuehn crwdns2934231:0crwdne2934231:0
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