So fair disclosure, today I started the topic "So when is it really just a fuse?" because of an incident I had with this game earlier. I'm not sure if it's related or just another red-herring coincidence (I seem to get those a lot in my life). Maybe I tempted fate by posting earlier. Anyway:
This morning my Space Station blew fuse F3 on the Aux Power board, which is a 2.5A that controls the pop bumpers and the right dock kickout. I replaced it and all was well for a few games, until this evening when it blew again. Further investigation revealed that mayyyybe a pop bumper switch might occasionally be getting stuck closed? I adjusted the suspect pop bumper, installed a 3A breaker into F3 (closest value I had) and started a test game with the glass off.
I wailed on the suspect pop bumper with no issues. Started playing in earnest, no issues. Started multiball with no issues. Managed to redock the balls for the Rescue Jackpot and then all hell broke loose!
Normally the Rescue Jackpot starts a light show with the playfield and backbox flashers. But this time, in addition, the credit knocker machine gunned in time with the flashers. There may have been other stuff going on but the overwhelming knocker racket obviously commanded my attention. Before I could think "holy shit that ain't right and not good either" the Jackpot sequence finished in normal time and then... every solenoid was dead. I confirmed this in the diagnostics: machine boots and all functions work, except the solenoids - not a single one of those works. No coils, no relays, no flashers, nothing.
I look at the Aux Power board again and fuse (breaker) F3 is fine! So hopefully I can rule that out as a hopeful red-herring coincidence I mentioned earlier.
But now F8 and F4 are shot. F8 is connected ahead of the 25V bridge rectifier. F4 is connected between the 50V rectifier and the A/C relay.
So given that, I understand why none of the solenoids are functional. But holy hell, what would have caused this to happen? I look at the schematic and I'm not sure which direction to pursue.
I presume the main power supply, though orignial and unrebuilt, is fine since all logic and lamps, etc works. But do I suspect a transformer feed into the aux supply? The bridge rectifier(s)? A relay? Something apparently shorted the knocker coil into the flasher sequence during the jackpot. And the Jackpot award sequence actually finished! But then everything died before I could think to trace it, so now I don't know what was "cause" and what was "further effect".
I didn't notice anything smelly or burned or charred, so hopefully the fuses did their job. OTOH the lack of any smoking components leaves me with no obvious place to start.
So, yeah. This station has gone from Condition Green to KLAXON RED... who among you can rescue the works?