Ok fellas I need some help. I recently picked up a BSD that had some opto issues. I knew going into this that there were problems. When i got the game my buddy told me that he has issues with the 10 opto board giving him problems. He did some fixes on it and it would work randomly so i decided to just purchase a new one to throw in there because i knew that the optos can play havoc in BSD. I initially plugged the new board in and started getting ground row 1 short error and it blows f-114 immediately.

I went through the game and checked for any issues with the row 1 switches and couldn't find any. Ok I thought, maybe it's the MPU board that has issues. I replaced the board with a known working one from a WPC 89 game that i had and it gives me the same errors. Must be on the playfield somewhere, but all of the Row 1 switches look ok. No loose diodes, solder joints or loose wires. I can't for the life of me figure it out.

I decide to look into the new 10 opto board I put in there and start unplugging connectors one at a time. I unplug the connector for switches 51-57, reboot and the error goes away but now none of the direct switches work. I can't get into the menu to test anything. Sometimes when i boot it up all the coils will pulse and not stop, other times it will boot somewhat normally.

Any help would be appreciated,it's driving me nuts trying to figure this out. Thanks

My mpu is new with a NVRAM installed. I believe my problems derive from the f-114 fuse blowing. Someone on Facebook just explained that the 12v for the switches comes from the 18v from the lamps and if that's blowing then I'll have issues. I did change br-1 already.

Checked them all and everything is seated correctly

when i put the original 10 opto board in it does the same thing. That's the only board that has been changed. I'm thinking that somewhere in the +18v line it a problem. I've swapped br1, wish i could find something that tells me what else to check.

its a +18v issue. It turned out to be a bad cap and br1. Apparently when I replaced the br1 I should've done the cap C2 as well. All is well now on the BSD front. Thanks for all the help. Donation made!

Ok now I have an issue with Coil#6 locking on. I replaced the TIP36 and the TIP 102. I checked the opto for that coil and it is fine. I hope it is not one of the IC chips on the driver board. Any thoughts on this?

I repaired the +18v line on the board. I spoke with Jerry Clause and i'm sending him the board to take care of. Unfortunately due to work i don't have as much time to spend on it as i would like. Thanks for the help though.