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Hi, all –

What does the little red indicator light above the 'RUN' switch mean? It appears intermittently – I’ve had a skim through the manual, but can’t find anything...

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(12-15-2019 07:49 PM)Maximilian Hohmann Wrote: [ -> ].....

Cheers, Max!

HP-67 Owner's Handbook, page 51:

Also occurs with poor or corroded connections creating resistance between the battery contacts and the circuit.

Since it is intermittent and KNOWING the batteries are fully charged, check the

1) gold plated contacts for corrosion.

2) solder joints inside the calculator and

3) especially the gold plated contact inside the calculator wall wart plug receptacle on the calculator.

Cheers