By no means am I an expert on this and I’m also a newbie to slot machines but I’m very familiar with troubleshooting and have been posting about almost the same issue that I finally isolated it down to one of the components that is connected into the Netplex board on the upper cabinet. Just a quick recap of what I went through:
- Installed a printer and a TITO as the same time into known good machine and when I did my machine.
- Lost all power to the machine except for a buzzing noise coming from the power supply and the lights on the MPU would cycle
- Disconnected both the TITO and Printer, still no power
- Disconnected components VFD, printer, Bill Validator, ballast (Didn’t really no exactly what ones to disconnect), no luck
- Swapped power supply several times with known good machine, still no power
- Swapped Power Distribution Box with other unit, no power
- Rang out wires for both continuity and voltage from the PDB to power supply and power switch, checked good
- Checked the resettable breaker/fuse in the PDB, checked good
- After countless hours a of troubleshooting went back disconnecting/isolating components causing my issue so I went into the upper cabinet and disconnect the harness that feeds through the lower cabinet to the upper cabinet. It connects to the Netplex distribution board and another board that has something to do with the sound (again newbie). Everything powered up except for the components that are connected to the NETPLEX board which is the ballast, printer and upper light.
- Still isolating it down to which one is causing my problem but maybe this will help.