I just finish my Nineball restoration and there is one probleme left! And this one is pretty weird
I made a complete swap, cab, coin door restoration, game was working fine before the restoration start 4 month ago
This is the problem...
If the right drop target bank is down, i can’t start a game, when i push the start button, the game reboot.
If 1 or all drop are up, I can start a game, no problem.
In switch test mode, with the droptarget down... slam switch number is 6 (credit buton), supposed to be 8. If one drop are up... number is good (8)
Same for the slam switch inside the cab.... drop down, number is 6 (credit switch) drop up 8 (slam)
Credit button show alway 6 like is supposed to be (drop up or down)
Coin switch number is ok (drop up or down)
An other interesting thing... if only top right drop target is up, switch test number when i push the slam switch is 7 (tilt switch) supposed to be 8 (slam switch)
To be clear switch number supposed to be
I already change diode on the credit switch, slam switch, tilt switch and all the drop target.
Recheck wiring and check for a short somewhere, remove start switch and slam switch to be sure there is no short on coin door. All the wiring look like my other stern coin door
Change slam switch.
I change the 5101 for a nvram that i have in hand, no change...
I cut the capacitor between the tilt bob and the wire
If I unplug j2 in the MPU... game boot with drop down
If i remove the plug for the GI at the power supply.., no change. (Looking for a short somewhere)
If i disconnect the big drop target bank (1-8) no change
I also try disconnect the switch matrix wire related to slam switch... no change
If i disconnect all the plug from the LDB, no change (looking for a short somewhere)
I need more idea...
Really bizarre... look like i have something wrong between j3 cab switch matrx and j2 playfield switch matrix