Prague
My upper Playfield lower exit optos are not working. I tried 3 different opto boards on it so that is not the problem. I also changed out the optos themselves. Any help would be appreciated. Thanks.
(Topic ID: 224889)
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Twilight Zone
Bally, 1993
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Quoted from Spinape:Then it's definitely something on the receiver end or the connection back to the board. A tv remote can work as a temporary transmitter.
But the tv remote didn't work for the functioning optos either. Are you talking about the opto board?
I covered the transmitter or receiver. The remote worked for neither.
A friend had some extra opto boards laying around so I tried 2 different boards and still got the same error and issue.
I also checked for continuity of the wires all the way from the optos all the way to the opto board. I'm stumped
I don't know what a logic probe is so I probably don't have one. I am pretty good with mechanical stuff and I'm slowly learning about boards and whatnot.
So since I put three different opto boards in to check it and have the same exact problem with each board, checking the highlighted areas that you sent may help solve my problem?
What is lm339?
Sorry for my lack of knowledge here but I really do appreciate your help
Quoted from Pin_Guy:I'm standing by my original post.
I'm assuming this is switch 76 which would be column 7, row 6. This would be really easy to isolate with a logic probe, any chance you have one?
Check ALL of your connections as highlighted below, I'm ignoring the column pulse wire since you would have multiple problems if it were bad; I'm also ignoring the CPU board for the same reason. If these connections all check out your LM339 at U2 is most likely the issue.
[quoted image]
[quoted image]
All of these connections appear to be good.
Quoted from Pin_Guy:It should, if you do this
and the switch activates, the optical transmitter, receiver, or wiring is the problem
If you do this and the switch doesn't close, you have a bad connection between the opto board and MPU...assuming this is the only switch in row 6 that doesn't work.
Can you confirm that this is the only switch in Column 7 that doesnt work?
Can you confirm this is the only switch in Row 6 that doesnt work?
Thank you for being so patient with me. I believe that I did what you said correctly. Now I'm not sure on how to figure out if I have a bad connection between the opto board and the MCU
Quoted from Pin_Guy:Check your resistance between 10 Opto Board J5 pin 7 and MPU J208 pin 7. If you shorted diode D5 on the opto board to ground and didnt get a ground short across row 6, I can already tell you this connection is broken.
I really am very new to using a multimeter. You said to check the resistance between pin 7 on j208 on the mpu and Pen 7 on J5 of the outdoor board. Is continuity the same as resistance in this case?
I'm going to assume that the connection is broken. If I tried 3 different opto boards and got the same error message that should tell me something right? So when you say that the connection is broken, basically you are saying that I have a broken wire yes?
When this problem first began it was as simple as turning the game on and getting the error message. I had manipulated nothing and had worked on nothing prior to this happening.
Quoted from Pin_Guy:Continuity should be sufficient.
You should be doing all of your checks with the game in edge test so you can see the switch closures.
essentially, it can also be a connector or header, and this wire isn't necessarily at the 10 opto board or MPU, it can be broken at any switch in row 6.
If you haven't actually tested all of the switches in ROW 6 and in Column 7 while in Switch Edge Test, please do so right now and post back which of those switches don't work. [quoted image]
Much thanks for all of your help. I'm working now but when I get time I'll test just as you said and post about the results. Thanks again.
1 week later
3 months later
Still having issues. Top and bottom mini playfield entrance and exit optos still not working. I replaced the opto board and the large molex connector on the opto board. Optos are lit up purple when looking through camera at optos as if they are working. Any input would be appreciated.
20190108_212413 (resized).jpg20190108_212432 (resized).jpgQuoted from Pin_Guy:This is the tool you need for repunching these Pancon MAS-CON connectors in tight spaces, they are a little spendy, but IMHO it's money well spent.
Can I just cut the wires and reattach to the new connector with this?
Screenshot_20190109-184745_Amazon (resized).jpg 3 weeks later
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