I got this HP 33C at a garage sale (plus another one for five bucks total!) and there was a lot of corrosion damage on the inside.
|They don’t make them like they used to.|
Some new NiCd batteries and quite a few jumpers to fix traces that corroded away were all that were required to get it running again.
|All of the flex traces were hosed and quite a few flex-to-PCB connections were bad too.|
Here’s the working calculator brought back to life.
|Never throw away tools. Fix them.|