Have a Rocky Horror machine, when turned on the ONLY thing that is visible is the red 5v LED on the MPU4. Absolutely nothing else, not one bulb, the reels aren't energized, nothing.
So far I have:
- Checked the fuses in the power supply
- Checked the fuses on the two sub boards in the cabinet
These are all okay.
I have replaced the MPU4 processor board with another known working one. Just the same.
I feel like this is power related, where are the best test points to check the voltage rails?
Or does anyone recognise this description and able to suggest something more?
Many thanks !