Hi all,
I recently found a SO that had many problems and didn't play at all. After finally getting credits to function, swing target to function, l&r rollover switches to work, spinner to work, bonus unit to step up, player 1&2 to function and 100 point relay to operate, phewww, it all works EXCEPT..... after getting the setup in place for an extra ball, roll over centre lane and extra relay pulls in. That ball continues to play fine and extra ball relay stays in. Next ball upon point score, the extra ball relay drops out but the ball index relay doesn't pull in. Can keep playing and scoring but when that ball drains the bonus doesn't score while stepping down and ball doesn't count up, resulting in same player playing again. Sometimes the next ball will do the same thing, other times ball index pulls in as normal. This happens with either 100 or 1000 point rollover switches ie sometimes it will work on either and I can't seem to find a consistent way to make this happen. Another thing which also makes sense but if you happen to get the ball through the spinner in the faulty mode, the machine tilts but doesn't do below.
If you don't tilt the free ball and drain it, the get extra ball to pull in again, operating the spinner resets the extra ball relay before it tilts from the rollover.
If I don't make an extra ball through a game, it all works as it should through to game over.

I have schematics and the manual but am kind of new to this but despite many hours spent on it, (or should I say weeks) I just cant work out why this is happening and think I may be looking at symptoms and not the cause. Frustrating but exciting. I keep thinking here it is, try something and no difference.

OK one other thing, the bonus unit steps up to 3000 not 1000 at start up. How can that happen?

Finger crossed someone can shed some light.

yes it goes all the way to zero (no bonus light on) the pulses up 3 times

*then

Cheers mate. I will have another look at it and let you know how I go.

Hi Cheddar,

Rookie mistake. Should have just concentrated on startup sequence from the beginning. RWY wire was attached to the swing target and advance relay side of the coil. This machine had a heap of oddities like that. Someone has "fiddled" with a lot however that solved the extra ball issue as well . Now have a 100% working machine. Note to self, get startup working 100% before chasing any other "problems"
All best!!

Ok spoke too soon. So the bonus unit stepping up too far is corrected. Had a RYW wire on one side of the coil and the RYW link to the ball release coil on the other. Needed a bit of adjustment on the EOS switch as that was really close and when the bonus unit stepped up from zero, it moved the switch momentarily making it step twice instead of once, and the third pulse was coming from the ball release when that was activated.

I still have an oddity coming up with the ball index relay. On the first ball, index relay pulls in if it goes through any lane for 100 point or 1000 point but if it scores 5000 points the ball index relay doesn't pull in. When the change relay is activated the l&r rollover lights are active, this gives the swing target value if you roll over either of them. The 1000 point line works ok, it is just the case if one of the 5000 point lights are lit. I am confused as the 1000 point score pulls it in no worries and the 5000 score is just 5 pulses of the 1000 point line so any help on this will be much appreciated.

Yes I have that, but doesn't that just hold open and pulse the 1000 point relay 5 times before it drops out? What I don't understand is why the ball index works for 1000 points but not for 5x 1000 points.

Hi currieddog, I must be still missing something. I am new to this so apologies if this seems obvious. The diagram above all works, the grey-w-4 wire is the 1000pt side of the equation. Above that there is a wire that hooks on to 4 spots (5000 points) of the swing target unit, operated by the swing target eos switch and that seems to be the issue, or at least the point where things go wrong. Just cant seem to work out why. according to the circuit, the ball index should pull in whether the 10pt, 100pt or 1000pt relay is operated and it does mostly, just not on that line. Appreciate your perseverance and patience with me.

Thank you so much Rolf!! You are truely the master. I didn't really understand the ball index circuit as drawn in the schematic but neglected to look in the manual to see if I could make sense. Dry solder joint on the second contact position was the issue. Theory proven correct!! Thanks to your theory and diagrams I was able to locate and repair the problem.
Kind regards