(Topic ID: 89014)

Machine gunning problem opto

By DarthSinex

9 years ago



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#1 9 years ago

I'm having a problem with my rfm.

1 opto started to machine gun in the switch test, triggering repeatedly it does stop however when you break the beam. Switched the opto and problem remains. Tracked it back to opto board where the fault seems to come from just 2 pins one on each of the 2 input connectors. If I switch another opto wire to the same pins the fault moves to that opto?

Any thoughts on where this repeated triggering can be coming from?

Mat

#3 9 years ago

Thanks, have thought this might be cause, but have tested the opto board and tracks for integrity and no problem upstream on the opto board. Then considered a fault in the IC which is U2 in this case, but think I have ruled this out because using an oscilloscope on the outputs there is no oscillation (machine gunning). The opto seems to have clean on/ off behavior out of the machine.

Is it possible that the cause is now one step further upstream (scanning circuit) either PB or processor is causing this behaviour? If so, how would I establish this and where would you look next?

#4 9 years ago

Just in case anyone else ever looks into this issue I solved it, and it wasn't dirty opto's, wiring related to the opto or the opto board. It was a standup target (specifically centre target 1 to the left of centre and right of the martian target) which had a short circuit. Although this switch was somewhere totally different on the machine due to the relationship with this opto and diodes and closed switches and witchcraft, caused the Right Popper Opto to misbehave. Found the solution on a site about Pinball 2000 technical issues (seemed someone had encountered exactly this before and called Williams who knew about the issue and the solution) - source http://www.pinball2000.de/​​
Stroke of Luck Opto:
(john.butler RGP 18.7.2000)
> Well the RFM I bought could not make it all the way through the party
> without having a problem. Guess that is what I get for not having time to
> shop it first. The kickout on the right side no longer detects a ball in
> the hole, so you have to wait for ball search to discover it.... Opto problem????
Possibility 1:
Forget the opto, I bet you it is OK.
I have a RFM and have experienced this problem. My original thought was
that my optos were bad. I swapped them with known good optos (which you can
borrow from your machine) and they tested good in every location except that
particular kickout. My problem was with a switch located just next to that
switch. Go into your switch test, (remove your balls, it makes things
easier) and look for a green square located next to that switch and repair
it.I bet you your problem will be corrected. This repair came directly from
Williams. He was very sure of this, so I bet you he has seen this problem
before.
If you want to E-Mail me your phone number, I'll stand in front of my
machine and try to walk you thru it.
Good Luck (Harry Williamson)
Possibility 2:
.... btw, it's probably not the opto.
more than likely the left-hand red target on the back-center shot (behind
the flip ramp) is shorted, replace w/new and you should be ok.
(Jonathan Deitch)
This is the same problem like noted above. Jonathan was right, this was the
problem..

So just in case anyone needs this again in 10 years, Ive written it down too.

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