1986 USSR Electronika 413 VFD clock repair

I recently bought an old Soviet era VFD clock, because I wanted to study how they built these things back in the days.

1986 USSR Electronika 413 VFD clock
1986 USSR Electronika 413 VFD clock

 

Unfortunately it wasn’t working when I got it so I took it on myself to fix it. Opening it up delivered a treasure trove of old tech; featuring at its very center a KP145IK1901 (Cyrillic: кр145ик1901) chip with a funny package, before even DIP became the norm.

KP145IK1901 chip, dated from 1986
KP145IK1901 chip, dated from 1986

It’s very hard to get information on this chip, but there’s an existing datasheet in Russian. It seems that it’s a micro-controller with VFD related peripherals built into it (e.g: high voltage output).

The fix was pretty easy; all I did was re-solder the transformer. It seems like a cold solder joint ended up killing the clock.

Moving on, I plan on building new projects with vacuum fluorescent displays; so stay tuned for more tutorials on this cool old tech!

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