Electronics > Beginners
Trying to find old 8k sram chips for HP-75c calculator pod
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wilfred:
If it was glue could you confidently infer there are also parts on the other side?  If the PCB was single sided *and* there were no glue under other parts eg the ram chips or something outside the picture shown would that point back to corrosion? Are these ceramic or tantalum caps?

not saying - asking.

#HP75c #repair #calculator #PCBcorrosion
Tom45:
It certainly doesn't look good.

Here is a cropped closeup from his original large photo.
RichardM:
Service manual attached. Also a couple of more photos. Looks like corrosion at all similar capacitor locations ?
RichardM:
And a photo of the reverse side.
wilfred:
You're going to need more of those caps anyway for the additional RAM so I would just order replacements as well. They aren't marked as polarised on the circuit pp32.

BTW. What's a kangaroo bus? top of diagram.
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