(Topic ID: 223877)

Dr Who Opto Question


By tjprice222

8 months ago



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  • 27 posts
  • 13 Pinsiders participating
  • Latest reply 85 days ago by beeker3000
  • Topic is favorited by 3 Pinsiders

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#1 8 months ago

Hey all - I'm working on the Doctor Who Time Expander and my optos have been acting up - particularly the ones on the left and right. After opening it up, I found this wire soldered between two opto receivers. I assume it didn't come from the factory like this but can anyone confirm for me? It's also hard for me to tell which optos are actually lighting even with my cell phone. Should I just go ahead and replace all of them? Probably should page pinball_faz on this one. Thanks in advance!

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1 week later
#13 7 months ago

Holy crap...I’m about to throw this onto assembly off a cliff. Thank you all for the replies. Here’s where’s I’m at:

I replaced all of the original optos and confirmed those were working. All we’re registering except the 5th - it was really flakey. I confirmed it was due to the wire jumper because the solder pad was gone. If I held pressure on the solder joint with my finger, it was fine but as soon as I relieved pressure, it was flakey again.

My solution was to order replacement boards from Marco. I installed both yesterday and now only two optos register in edge test mode - 1 and 2. I can get them all to register if I place the boards literally touching optos to receivers but as soon as I put them in the bracket holder, only the first two register consistently. Not to mention the new receivers are taller than the old ones and are interfering with the mushroom buttons.

I’m kind of at a loss for where to go from here. I guess I’m trying to see if anyone else has had issues with the Marco boards. I should have just gone Great Lakes modular. Any other recommendations for an easy fix?

#16 7 months ago
Quoted from pinballplusMN:

If the receivers are interfering try reversing the 2 boards. Its possible they are flip flopped.

I made sure it wasn’t that. The receivers on the Marco boards are definitely taller. By the way, the bottom of my opto bracket appears to be bent or tapered. Can anyone confirm this is normal?

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#17 7 months ago

I contacted Great Plains Electronics last week to order the opto boards but I haven’t heard back. Anyone else been in touch?

1 month later
#22 5 months ago
Quoted from beeker3000:

This device will square your bracket giving the buttons enough clearance to operate smoothly. Plus, it will eliminate light bleed. If you don't own a 3D printer, you can order a print through the site. That's what I did. Treatstock was printer I selected. Great quality and it cost me less than $10, including delivery.
https://www.thingiverse.com/thing:2387162
By the way, I'm in exactly the same boat as you. I ordered replacement optos from Marco (Gulf Pinball is the manufacturer). The output from the transmitters is so weak that I only get a response when they are literally touching the receivers. I'm still trying to work out if the issue is with the board or my terrible soldering skills. Have you been able to make any progress on your setup?

I’m happy to report that I received my original opto transmitter board back from Chris Hibler and popped it in yesterday. MPF is back in and all 5 optos are registering 100%!

However, now that the game is back together, my Enter T.Ramp Opto #33 is no longer working. It came up in Test Report and sure enough, won’t rehister in edge test. It’s definitely plugged in and I resoldered the joints on the 10 opto board under the playfield. Is the next step replacing the Tx?

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