I have a Bally 5500 in for service. Machine had no signs of life at first, not even fluorescents. Tried a different fluorescent bulb for the reels and at least that’s working. No LED’s lite on any boards. Swapped out the power supply and now I have some life. LED is on for the coin in optics, inside the DBV bill head and the red reset LED on the MPU. I do not have a door display or any coin insert or 25c door legends lite? Let me back track, the first thing I did was install a new MPU 1/2 AA battery since the one was dead.
I am reading 5.38V and 12.5V at the far left plug on the power supply but no 7.5V? None of the circuit breakers have tripped, even checked them with my meter. I think if I remember correct that I need the 7.5V for the door display? The machines transformer is cold even after being on for 30 minutes.. What could be the problem? The power supply in the machine is on I just bought. The original one from the machine did not show any voltages.