Texas Instruments TI-5040 Adding Machine

Got this at a thrift store today because the keys felt mechanical. It is, kind of. It's like the whole keyboard is one big switch. There are 12 leads coming out the top that are soldered into the pcb. I'm assuming these are the 8 columns and 4 rows. The stems kind of look like cherries, but the caps are slightly too big to fit on a cherry stem. Anyway, I thought it was interesting and couldn't find much online about it. I'm not sure if I'm going to try and make anything from it. It would make a cool numpad though.

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SpacemanToby

Unread post22 Oct 2017, 01:29

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Looks like a cool calculator! Clean it up and turn it on!
green-squid

Unread post24 Oct 2017, 18:14

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I bet you could place foil tape over the keycap mounts and pop the foil mounting it on a cherry switch, and it would hold tight.
rich1051414

Unread post24 Oct 2017, 18:53

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rich1051414 wrote:I bet you could place foil tape over the keycap mounts and pop the foil mounting it on a cherry switch, and it would hold tight.


Actually, I spent some more time with it tonight. The problem isn't the size of the cross mount, but that it won't fit down in the switch in order to press on. I took a stem out of a switch and it actually fits nicely.

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SpacemanToby

Unread post25 Oct 2017, 02:17

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green-squid wrote:Looks like a cool calculator! Clean it up and turn it on!


Unfortunately I couldn't get it to turn on.
SpacemanToby

Unread post25 Oct 2017, 02:21

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SpacemanToby wrote:
green-squid wrote:Looks like a cool calculator! Clean it up and turn it on!


Unfortunately I couldn't get it to turn on.

That sucks. Maybe a capacitor problem?
green-squid

Unread post25 Oct 2017, 06:13

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Power on using a ballast (regular 60W bulb in series with it is sufficient, check google for how to wire those up).

Check current draw, check if it draw a lot of current or abnormaly low. If you have an IR thermoter or even FLIR cam, check for hot spots, those are usually failed devices and/or shorts.
Check MOVs / resettable fuses and soldered-in fuses if they'r blown or damaged (they can break from dropping the device, etc.)

Try powering it up without the printer connected, sometimes a fault in those components causes the entire thing to appear dead.
polemon

Unread post05 Nov 2017, 23:34

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