My in-laws brought us some items that belonged to Felice’s Grandpa Al. He was a great guy. This lovely calculator was probably used for all of his book keeping and such. Unfortunately it didn’t turn on anymore and the battery compartment had crusty deposits.
Removing 4 screws.
Pretty self-explanatory.
That’s a vacuum fluorescent display.
Crusty power jack.
I don’t know what the wet/varnish looking deposits on the PC board are.
Close-up of the display.
More crust on the battery terminals. Vinegar cleaned it up.
So many screws holding the keypad PCB on.
The main IC, interestingly enough it’s a TI chip.
The board was held on with two rubber mounts.
PCB layout was such an artform back then.
Almost done with those screws.
Slider switches and rubber dome switches with carbon contacts.
That’s a thing of beauty.
Those damn contacts kept jumping off. I lost one and glued the other to the slider.
Keys. I’m really glad I took pictures of the thing before I inadvertently dumped all of the keys out of the housing.
A quick contact clean and de-crustifying and it works.
The refresh of the VFD is captured by the camera at different distances oddly.
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