Quoted from Mathazar:
Thanx, @frunch and @zacaj....I'll be trying that sometime tomorrow after I venture out and pick up some more 2.5A fuses. I did have something interesting happen with my very last spare fuse tonight if it helps....I followed the coil wires as best as I could without actually clipping the ties holding the harness together and didn't see any nicks or cuts in the wires leaving it exposed for shorting out. I did move the wire harness around a bit during the inspection. I decided to try my last fuse, and sure enough it started working. I ran thru the coil test and manually fired each one 5 times...worked like a champ. I started a game and played 3 complete games with multiple 3-ball multi-balls going on in each of the games....everything worked. Somewhat satisfied but a bit concerned that it appeared "fixed" after simply handling the wire harness, I propped up the playfield so that I could re-attach the apron, put the playfield back down, powered on, and F2 blew again.
I'll try pulling 2j13 and the drop target reset tip after I pick up a few dozen more fuses and report back. Thanx again....
Finding a 2.5A SB fuse locally proved fruitless - nobody carries them where I'm at (Lowes, Home Depot, Ace Hardware, Radio Shack Express). All were happy to order me some, but no one stocked them. Pack of 10 arrived from Amazon today so I resumed troubleshooting.
- All coils moved freely when testing by hand. None stuck.
- None of the four target banks reset at power on.
- Before I tried pulling 2j13, I decided to do the following:
I thought back to when this started - I lifted the playfield to clean a contact in the turnaround (it would register a ball going thru about 50% of the time). After cleaning the contact and putting the playfield back down, that's when F2 started blowing. I went thru three fuses without moving the playfield. Then I lifted the playfield again to inspect coils and coil wires. In that process, I moved a cable harness around and put the playfield back down. I went thru the manual coil test one by one, all firing correctly. I lifted the playfield again to retrieve a flashlight I left in the cabinet (too far back to reach thru the coin door) and re-attach the apron, put the playfield down, and F2 blew again. This was all on Tuesday.
Flash forward to today now that I have some more fuses. I thought about the correlation between the cable harness moving and the solenoid fuse blowing coupled with knowing that none of the coils are stuck and all seem to be free-moving. I took a closer look at the cable harness location and decided to route it to the left of the transformer next to/on top of the cage instead of leaving it hanging/dragging on top of the components next to it (see photo). Since doing that, the game has played for 2+ hours without an issue, and I've lifted and laid back down the playfield several times. Note: the transformer has a very noticeable "hum" to it...pretty loud when you first turn the game on, then quiets down within a couple seconds, but still significantly louder than my EBD machine. Transformer looks original.
Next step is to rebuild/replace the transformer, but in the meantime BK is back to being playable.
Wiring Harness Move 02a (resized).jpg