OK, got it powered up and have some issues-
Voltages are a little off from spec (using a Bally 122-125 transformer/AS2518-18 rectifier- don't know how I lost the Stern transformer and ended up with a Bally!)
On the rectifier (with nothing else plugged in)
TP1= 6.55 vdc
TP2= 187.6 vdc
TP3= 13.37 vdc
TP4= 7.59 vAC
TP5= 46.9 vdc
Plugged in the Solenoid Driver Board
TP1= 5.1
TP2= 170.2
TP3= 5.1
TP4= 268.3
TP5= 15.58
Plugged in MPU J4
TP1= 5.0
TP2= 14.45
TP3= 23.1
TP5= 5.01
MPU booted, but didn't have anything else plugged in yet.
Then I messed up and instead of going thru the VSU-100 card I plugged the harness into the upper left lamp driver board directly. Turned on and MPU booted but rebooted after a couple minutes. This may have happened the first time I booted MPU by itself (before the lamp board mis-plugging not sure since no sound card installed yet.)
Realized my mistake and installed the sound cards and lamp driver correctly. Booted and got the 'bong' sounds but MPU again rebooted by itself after a couple minutes.
Plugged everything in to MPU, lamp boards, solenoid driver. Booted but game did not go into attract mode. I don't have balls installed and under playfield fuse is removed right now.
Tried to go into diagnostics and doesn't respond. GI is on but no controlled lamps. Displays glow but no digits are lit.
Sorry this is so long. Hope it makes sense.
Any damage suspected from plugging lamp driver in instead of thru VSU? They are keyed the same...
Should I move transformer tap from 115 to 120V?
Any suggestions to get to attract mode and diagnostics? Thanks for any help here.