Quoted from TZ:I'm working on a Gottlieb Volcano and am dealing with an F6 8A SB fuse in the cabinet bottom that keeps blowing. The game is disassembled (playfield removed, backbox taken off) which I don't believe should make a difference? With the A7-J10 plug (A6 Sound/speech board power supply) disconnected the fuse will not blow, however when connected the fuse continues to blow. I did replace the CR3 diode on A6 board which appeared to be shorted, but it did not help.
F6 is called the "solenoid" fuse (page 12, section C).
• Fuse F6 is inline with the 25 VAC transformer output.
• It goes into pin 13 of the A7-P5 (A7-J5) playfield connector.
• Then it goes into the shooter-lane-aiming motor and returns on pin 14 of A7-J5 (A7-P5) connector.
• Then straight back to the transformer.
There are two rectifier bridges across this 25 VAC;
One is a 38 VDC output that runs to several relays and solenoids via pin 1 of A7-J11 (A7-P11) connector.
• Right Ball Gate solenoid
• Motor relay
• Ball Saver relay
• 3 Kicking Rubber solenoids
• 1 Kicking Target solenoid
The other is a 24 VDC output that runs to pin 1 of A7-J10 (A7-P10) connector of the S/S power supply, which you've already identified as the possible root cause.
Do you have the manual/schematics? Look at pages 34, 35, 37, and 38 to see the wiring of the items I described above. Pages 37 & 38 contains the schematic for A6.
Did you look at CR1 and CR2 of the A6 S/S power supply? The rectifier bridge? Capacitor C2 and C3? Transistor Q1? Any one of those could be shorted or leaking to ground.
Long Beach, CA
