If the fuse you are looking at is F2 Solenoids 5A, this feeds power out CN2 and CN3 on the power supply... you could remove these and find out which one is causing the fuse to blow. This power then feeds the solenoids and is grounded by the output board. You could remove connectors on the Output Board Responsible for the solenoids... CN14 15 and 16 and see if this stops the fuse blowing. Transistors on the output board RHS are responsible for the Solenoids and can be checked easily with a meter once the Board is removed. However to blow the fuse you would require both a shorted solenoid (diode) and a Shorted Transistor. If you just had a shorted transistor the Solenoid would just come on and stay on when power is applied. Solenoid would get hot and start to cook.
Flipper Solenoids should not come into play until the flipper buttons on the side are depressed and the relays under the playfield are energised?
