What game is it?

S.U. == Step Up

When your ball unit operates it either steps up or resets.
does your outhole relay pull in when the ball goes to the outhole?

Have you cleaned and adjusted that relay?

--Jeff

Ok. your description of the outhole relay sound straight out of a williams manual.

Just guessing as i have no schematic or manual for that game but check...

Outhole switch shown for Ball Count SU
Ill bet the Ball Index relay is in sequence also. Look at that in the manual and see if it also has a switch related to the Ball Count SU

Make sure all those switches are cleaned and gapped correctly

--Jeff

It does mean in circuit to pulse the unit. You could start jumping connections to find where problem is.
You should get a flexstone for cleaning and a schematic.

Review the EM repair guide on pinrepair.com

-Jeff

yeah i dont think there is a trough switch on your machine.

To jump connections you get an long wire with 2 alligator clips and start jumping connections.

For instance the outhole relay switch to the Step Up coil. When the out hole relay fires it should fire the coil assuming that is the right path.

Just a thought. Take a look at your ball count unit and look at the 0 position ball switch.
Make sure its correct (open i think you should be able to tell )

--Jeff

no screwdriver. It can be a shocking experience. also you could cause a short.

The switches look like they are adjusted correctly
That is a latch relay. If i understand correctly it seems to me like the latch isnt releasing.

push the metal bracket piece on the smaller coil and the latch will close. push the plastic on the larger coil and it will lock in and open.

It sounds like maybe the latch is not working or moving freely. try closing the latch and then opening. you should see the make/break switches change position.

it looks like what youre saying is that the latch should be what i call closed.

--Jeff

Lets see pics of the other relays that are in sequence...
Could be a score motor switch but lets check the other relays first

--Jeff

Is there a ball index relay on this machine? is it in sequence also?

heres the reason i ask. Heres a similar schematic from 68

outhole - ball index -- extra ball -- switch 2A on the motor

you can see the 2nd coin in a circuit that also will SU in the Circuit with 1B
that circuit will go around 2A

Also could you post a pic of the out hole switch itself
LLSchem.png

Where the ball ejects from.
From the description the ball index relay is exactly where it is on the schematic. inbetween the outhole and and extra ball relay.

Make sure that whole circuit is cleaned.

now what you could do is....
alligator clip from outhole relay to step up coil
if that fixes it then move the wire to the
ball index to step up coil
if that fixes it then move the wire to the
extra ball to Step up
etc until it breaks

that will narrow down which is the issue

--Jeff LLSchem.png

you want to put the wire on whatever the non common wire is on the SU coil.
Normally its the non black wire
Does that make sense? All were doing here is eliminating switches to see which the problem is

remember you need to close the out hole switch to make the SU fire the with the way ive wired it

also this wiring assumes that your outhole relay closes correctly. you could move the wire to the other switch of the outhole if you want to bypass that

remember were only clipping to one side of the switch and it has to be the switch in the sequence

--Jeff

yeah random is probably the not common wire.
Tho its odd as most from that era the comon is Red or Black
You put the clip on the outhole relay switch wire (Red/White on the make break switch) not the coil itself yes?

Excellent.
that leaves the ball index relay im pretty sure. Its normally open.
It closes any time points are scored and holds in.

so if you knock some points on it should be energized by the time the ball hits the outhole

It it possible that it is not closing and completing the circuit?
Is it energized or not when the ball is about to go out?
Can we get a pic?

--Jeff

that would be my guess also
heres a clip form the similar schematic im using. you can see where its a straight shot from the pts relays to the BI unit.

I dont think that i would beleive that every one of those switches would be mis adjusted or dirty.
I would test the BI coil with a 9 volt and see if it fires. I would also manually activate the pts relays and see if the BI fires.

Were real close

--Jeff

llbi.JPG

awesome!!
What was the problem with the ball index relay?

if the 100 relay is stuck on check all 100 pt playfield switches and possibly the scoremotor.

That one i really cant troubleshoot without a schematic

--Jeff

heres the williams animation
http://pinside.com/pinball/forum/topic/williams-score-reel-operation-animation

check the EOS switch on the score reels. Is it possible its not getting activated when the reels turn?

ohm out the coil on the 1000 score reel.
is it even pulling in when the 1000 pts relay is activated?

--Jeff

good news!

Have fun flipping
--Jeff