Got a HP 19C

[teenix]

(11-22-2016 09:21 PM)david sanz Wrote:  Thank you for the sugestions.
Did I say it did not look like an absolute disaster? Well, it turns out it is. Just opened the calculator, to find four broken «golden fingers» ( it was not me, belive me). Plus some white stuff on the coil at the bottom of the PCB and blue stuff in the nearby big resistor.

Perhaps not

If the chips are ok, then the other problems could be repaired if you feel confident enough. The circuit board can be carefully cleaned. The "stuff" might just be the cause of the improper operation - perhaps upsetting the power supply circuit. Fiddly, but coils can be rewound if corroded, simple components like resistors can be replaced and possibly someone in this forum may have extra fingers from an old unserviceable calculator or know of something else that will do the job. If any of this works, it will be a cheap fix.

I don't think it would be wise to apply any more power to the calculator until it has been cleaned up.

cheers

Tony