I powered on the Vector and see the checkerboard and hear buzzing and "rus" light is on.

I pressed "VVOD" and "BLK" simultaneously. The screen goes black, the "rus" light turns off, the buzzing stops, and I hear the relay go click.

I play the "testtp.rom" and hear the tones on the Vector06-c speaker.

When it's done playing the LED doesn't flash and the screen stays black.