Junk Yard trough opto problem

[Alan Syson]

JY is chucking two balls into the shooter lane. Problem first came to light last NERG, I turned up at the set up to find @ronsplooter looking into it. I left him to it & the machine performed flawlessly for the weekend, did you find a fault Mr Splooter or did it fix itself?
On return the fault came back, did some poking around without finding anything but the fault disappeared. Fast forward to a company of days ago, had to lift the PF & the fault returned.
In switch test ball 3 isn’t recognised, all transmitters are illuminated on the trough opto board so I replaced the receiver, no joy.
Took the trough boards out of MM & put them in, no change. I have continuity from receiver 3 (yellow/orange) to main opto board & now I’m stumped. Any ideas out there?
Cheers, Alan.

 

[James]

Sounds like an issue on the trough jam opto. That signals to kick out two balls. How’s that in switch test?

 

[strobey]

Trough receiver opto 3 bust or not connected.

Imagine trough optos 1,2 3 as XXX or OOO depending on if open/closed...

So:

3 balls in trough - XXX - all optos closed: all 3 balls breaking the beams.

2 balls in trough - XXX - all optos closed: 2 balls breaking beams 1&2 and 3 which is bust. So pin still thinks 3 balls still in trough and hence retires kickout.

Now youve got 2 balls in shooter lane.

1 ball in trough - XOX - real ball at 1, none at 2, bust at 3. Pin now knows ball is in shooter lane, although something not right in trough. Doesnt care, as its counting 2 balls as being in trough. Must just be a jam and will wait for a drain to help clear it... so game carries on as normal.

Tim

 

[ronsplooter]

did you find a fault Mr Splooter or did it fix itself?

Alan, from what I remember we fiddled with the trough opto connectors and also the connections in the backbox and it fixed itself. I don't remember making any particular fix though... @Wizcat was with me I think, Paul you remember us doing anything with this?

 

[Alan Syson]

Sooo.. just swapped with the MM trough opto boards again and JY works fine. Alternating receiver/trans in JY points to the receiver board being duff. My replacement receiver is bad, my soldering’s crap or there’s a cold solder somewhere. Why didn’t I take up stamp collecting for a hobby?

 

[Andydn]

Reflow solder on your opto receiver board, could be cracked or dry around the connector socket maybe?
Does the issue transfer to MM when using your JY receiver?

 

[Alan Syson]

Does the issue transfer to MM when using your JY receiver

Yes. Something I didn’t try yesterday so it’s deffo receiver board. I bought a soldering station a couple of weeks ago & it has a hot air reworking thingy on it so I’ll give it a blast with that. If no joy think a replacement board will be easiest

 

[Andydn]

Check the resistors too, they get hot and become loose sometimes, reflow everything and I bet it’ll work fine [emoji1360]


Sent from my iPad using Tapatalk

 

[Wizcat]

Alan, from what I remember we fiddled with the trough opto connectors and also the connections in the backbox and it fixed itself. I don't remember making any particular fix though... @Wizcat was with me I think, Paul you remember us doing anything with this?

You've obviously got a better memory than me

I doubt I'd have done more than reseating the connectors, as you say. I suppose we just got lucky!? Sorry, I have no good advice here! Good luck Alan