(Topic ID: 317233)

Scared Stiff Trough Opto issue

By Chrizg

9 months ago

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  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 8 months ago by DumbAss
  • No one calls this topic a favorite


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#1 9 months ago

I have a scared stiff on location. Getting bad trough opto message on boot and cycling balls out. Replaced the power driver and it worked for a couple hours then did the same thing. Replaced the trough optos, cpu and 16 opto board under the pf. Other 3 optos that share the trough on the row work. Trough optos show a glow when using cell phone camera so they getting 12v. Get tone on the green-orange wire from the cpu to the 16 opto board and getting tone from the connectors from the 16 opto board to the trough board connectors. Any ideas ?

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#2 9 months ago

Go to switch test and see which optos are actually not registering. You checked the column wire but didn’t mention checking the row wires.

So, for example, if you have a loose wire on the trough eject row it’s going to cause that problem.

You also mentioned that swapping the driver board worked for a little bit. That could just be because you disturbed the wires enough to get continuity temporarily. Same thing with your column wire continuity test. You could have an intermittent (loose solder joint) connection on that column wire that passed at that moment and fails as soon as the machine vibrates during play

ID the intermittent/failed opto and get under the playfield and physically inspect every switch connection on that opto’s row and column

#3 9 months ago

I had a similar issue and what fixed it for me was reconnecting the wires in that IDC coming from the power board or main board going to the opto board under the playfield.

1 week later
#4 8 months ago

So the game is now in the shop. I have done the following

All optos work that are highlighted in blue on the attached pic and I don't think this is a simple switch matrix wiring issue
Toned all associated wires from the CPU to the 16-opto board and from the 16-opto board to the trough connectors
Toned the column white/color wires from the 16-opto board to all switches on their respective columns
All test points on the power driver board read correctly
Opto boards and 16-opto board have 12v
Opto boards show glow in cell phone camera confirming they are getting power
Swapped the 16-opto board with a known working from a Champ pub
Removed all unnecessary connectors on the power driver to eliminate any possible issues

Prior to this coming in the following was done

CPU was replaced with Rottendog
Power driver was replaced with Rottendog
16-opto board was replaced with NOS
Trough boards was replaced with Anarchy trough boards

Previous to this failure and before the machine went on route the original CPU and power driver was rebuild by Coin-op cauldron so they should be legit.

ssopto (resized).jpg
#5 8 months ago

So got it up and running. I think we had a couple of issues going on. I think at first the connector on the power driver that provides the 12v to the 16-opto board was tarnished or whatever and failed to provide power. After it worked for one night after the power driver was replaced and the connector was essentially reseated, the connector stopped working and then we shotgunned and replaced everything since it was in a remote location to me. Unfortunately the anarchy opto boards were DOA and compounded the problem. And they had some odd solder work on them also when they were made. There was also a broken opto on one of the OG boards that was very hard to find

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#6 8 months ago
Quoted from Chrizg:

And they had some odd solder work on them also when they were made.

Wow. I am surprised someone would try to sell a board with that kind of soldering work on it. At the very least the flux should be cleaned off.

Quoted from Chrizg:

There was also a broken opto on one of the OG boards that was very hard to find

You can use QED123 for transmitter and QSD124 for receiver. This isn't the only opto transmitter/receiver pairs that you can use. Other manufacturers also make compatible transmitter/receiver pairs. It is best (but not necessary) to replace them in pairs so that they are matched for their optimized wavelength.

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