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.

Nova 3 Console disassembled

Nova 3 Console Lamp Driver DG part 113-7748

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