HP-67 Card Reader became very touchy

[Hiwi]

Polarity of tanatalum caps with colour rings:

there is always a small colourpoint on one side (defining the voltage range), if you can see it, then the right pin is the positive.

On some tantatalums (with a flat surface) this colour marking is on top but a bit out of the middle, here the pin which is nearer to this marking is positive.

Ralf