1977 Blackjack and Calculator Diagnosis

I got a Unisonic 21 untested and it turned out to need some work. Time to figure out what's wrong.

This is a fairly anticlimactic video. It ended up "working" in the end but I didn't really do anything. I did notice it did actually very faintly turn on in the beginning, I still don't know why it got brighter over time.

Yes I could buy the capacitors, but it doesn't make sense to place an order for just this device. Although I may do that in the future with an online order if I piggy back it onto something else.


About the back filming surface, after a test video I decided to record a complete video using the underside of my ESD mat. Here is the test video:    • mattest   The blue reflects a lot of light onto the subject and into the camera during macro shots. A darker mat would give a noticeably better image quality. But the black is too dark. It didn't work well for this video. I will be going back to the blue side until I get something else that works better.

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Playlists of more stuff like this:
Calculators:    • Calculators  
Electrical Engineering:    • Electrical Engineering  
Repairs:    • Repair  
1970s:    • 1970s  

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