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PANAMATIK · (This post was last modified: 05-20-2017 04:14 PM by PANAMATIK.)

(11-22-2016 09:21 PM)david sanz Wrote: 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.

The four broken fingers are not broken, they had to be cut to follow the slanted PCB leveling. All HP-19Cs have four smaller fingers at this part of the connector.

Your PCB looks very clean compared to my HP-19C machine, which I just restored. I measured all capacitors and resistors and they were still working. The transistors are prone to fail. You can replace them by any standard TO-92 NPN type like 2N3904, 2N3704 to get the power supply running.

Bernhard