WOW - some progress - tks for the input.

Have got the sound working after removing and cleaning the connectors. Tick that one off.

I tried the same with the driver control board and I managed to run three games and a test circuit of the solenoids - all worked great THEN, back to the repeated resetting of the drop-targets, and no ball eject. Grrrr

I may do another clean and reset of the connectors. The previous owner told me that the machine did that when he got it ten years ago. Will also try and resolder the connector pins. I have got a decent soldering iron to do the work so will try and get that done tomorrow.

Thanks again for the input - greatly appreciated.

When you have the SDB out re-solder ALL the connector pins on the board not just the ones for the connector giving you trouble, this wil eliminate any other possible intermittent issues