Was playing Meteor when the coils stopped working. Checked the fuses and F4 (5a) was toast. Replaced it and it blew immediately on powerup - I get the other beeps on the MPU, but cannot boot up completely. Pulled J1 and J3 off the rectifier board and tried with another 5a which blew immediately on powerup again.
Before I run through any more 5a fuses, what should I check? I cannot find any shorts.