PLEASE HELP : SWITCH PROBLEM

Hi guys

I would greatly appreciate your help.

Turned the pin on today and immediately noticed she wasn't running like normal. A quickly discovered the fire button wasn't shooting the cannon. Then I did a 'test' and found 8 switches were not working.

3 targets that open locker
1 ball eject
2 ball drain
1 lower right slingshot
1 fire button

I have posted a picture of the switch locations.

Seems they all use a green wire.

I checked the fuses with my multi meter and they seem ok.

I turned the machine on again and I have found that there is DC power going to the wires that connect to each switch. So they seem to be getting power!

Getting power but not communicating to back box ?

I have no idea what to do next or where to check?

I also posted a picture of the back box message at the start of 'test switches mode'

Looking forward to your suggestions.
Thank you

black_rose_switch_locations_(resized).jpg

black_rose_back_box_(resized).jpg

Thanks guys ... I will follow your advice and check some more stuff.

Greatly appreciated

Hi everyone

Thank you all very much for your help, it turned out to be U20 chip. My queen of the high seas is back