The Nova 3/12 Console is repaired


The ”Stop/Reset” toggle switch wouldn’t toggle back to its center position so I took a switch from my other Nova 3 console. Turns out that  this switch would not make contact in the “Stop” position and I had to grab yet another switch from my other front panel. Looks as this front panel rapidly is becoming an assembly to salvage parts from.   

All indicator lights are now replaced. The leads of the ones that did work where extremely brittle and since incandescent lamps have limited lifetime I decided to replace all lamps. Lights 7 – 12 would not lit or if they did, they lit very dimly and sporadic. The driver chip, DG part # 113-7748 was faulty and I replaced it with a NTE74LS06 chip (Hex Inverter Buffers/Drivers With Open-Collector High-Voltage Outputs).   

Now that the console is working (apart from lacking the XX2065 key which I have ordered), I can start testing the cpu and memory.

Data General Nova 3/12 chassis

Nova 3 Console disassembled

Nova 3 Console disassembled

Nova 3 Console Lamp Driver DG part 113-7748

Nova 3 Console Lamp Driver DG part 113-7748

Nova 3 Console Lights

Nova 3 Console Lights works fine after replacing all lamps and a driver IC

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  1. #1 by Nick on Saturday 16 February, 2013 - 19:08

    I would love to see a video of the Nova 3 with the lights blinking while it is running. I consider it “pure visual poetry”!

    And thanks for sharing your project details for us old DG afficianados and professionals.

  2. #2 by Tommie on Saturday 16 February, 2013 - 19:14

    Unfortunately, the Nova 3/12 is in this picture is no longer in my possession. I gave it back to the guy I got it from once it was repaired.

    However, do not despair! A few days ago a guy called me and asked if I wanted his Nova 3/12. It is a complete system in a two cabinet configuration. Complete with software and documentation. I’m not sure when I will be able to pick it up but since it is not too far away hopefully it will be within a few months time.

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