Drop Targets Not Registering

[democratsorginize]

My Sinbad solid state drop targets. The second yellow and last purple do not score points when dropped. I checked the wire harness connections on the board and they look good. All switch contacts are good. All switch matrix diodes are good. The machine was upgraded to new boards prior to my ownership, Ni-Wumpf CPU. Any known issues with new boards or anything else?

 

[meesterpieter]

not sure about these old ones but do they reset properly? if they do reset but not score you'd think its not the sensors

 

[Dave Playman]

I had a similar issue with one bank of drop targets on black knight. Everything looked ok initially, however upon closer inspection, the ground wire that is linked across the leaf switches on the target bank was barely connected. I re-soldered it and now working 100%
I hope you sort your issue soon

 

[democratsorginize]

I had a similar issue with one bank of drop targets on black knight. Everything looked ok initially, however upon closer inspection, the ground wire that is linked across the leaf switches on the target bank was barely connected. I re-soldered it and now working 100%
I hope you sort your issue soon

Update, the switch matrix diode banks under playfeild had 2 breaks in the wire that ties all the diodes together on the MPU side. Once I repaired those the game now works perfect. Now I know to check this in the future.