(Topic ID: 158644)

Has Anyone Had To Replace Cables or Harnesses?


By Allibaster

3 years ago



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  • 14 posts
  • 6 Pinsiders participating
  • Latest reply 3 years ago by Allibaster
  • Topic is favorited by 1 Pinsider

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SS_Switch_Matrix_(resized).png

#1 3 years ago

I'm having (another) opto issue on my Scared Stiff. The two optos in the crate are working intermittently. I found out that if I shake the harness, they either trigger or starting working again. Even if I disconnect the connectors that go to the optos and shake the harness, the switches sometimes register. The connectors look good. Seems like there's maybe a short or open in the harness.

Thoughts?

#2 3 years ago

Have you reflowed solder on the opto boards?

#3 3 years ago

I had same issue on my Dr who cracked solder on a opto couldn't see it. I re soldered all my optos works perfect now. maybe that's your issue.

#4 3 years ago
Quoted from ForceFlow:

Have you reflowed solder on the opto boards?

I reflowed the connections for a previous issue which is now resolved.

If I move around the harness near the optos, they'll trigger. If I move them around the opto PCB, no triggering. It's odd.

#5 3 years ago

Here's a video of the issue. Note that two of the three optos that I pulled on had new IR transmitters and receivers.

Any ideas???

#6 3 years ago

Bump.

Based on the video, do you think some opto connectors need to be re-done?

#7 3 years ago
Quoted from Allibaster:

I reflowed the connections for a previous issue which is now resolved.

What was the issue?

From the video, looks like the connectors are suspect. But it's weird that more than one would be causing problems.
Have you tried disconnecting and reconnecting? Did you inspect the crimps to see if there might be an issue there?

#8 3 years ago
Quoted from pincredible:

What was the issue?
From the video, looks like the connectors are suspect. But it's weird that more than one would be causing problems.
Have you tried disconnecting and reconnecting? Did you inspect the crimps to see if there might be an issue there?

https://pinside.com/pinball/forum/topic/opto-issues-on-scared-stiff

TDLR, replaced trough opto board after the switches were flickering and usual fixes did nothing. Lost two optos in the process. New trough boards were the culprit.

Now, it seems like all optos are just very touchy. Seems really weird.

#9 3 years ago

I disconnected all the optos and tried to narrow down the issue. Only three optos trigger with the harness moving - popper and both crate switches. These three are in a sequence on the matrix. Also, they trigger by gently flexing the Molex connector for each switch, so it's not the harness.

Any ideas on where to go with this next? I'm really struggling to figure this one out!

SS_Switch_Matrix_(resized).png

#10 3 years ago

Have you checked the opto alignment? One possibility is you wiggling the wires brings them into proper alignment.

#11 3 years ago

If it were me I'd cut and re-crimp the connectors with new ones If only to eliminate that as an issues ( cheap enough). I would also double check that each wire is in the correct position. Its odd that wiggling the connection would trigger the switch.

#12 3 years ago

Ordered some Molex parts. Going to try that next. Should be here towards the end of the week.

I hope this works, but I am doubtful. Seems suspicious that these three switches are sequenced on the switch matrix.

#13 3 years ago

Re-pinned the three connectors and everything appears to be working! Only put one game on it, but I think it's fixed.

I'll report back after getting some more time on it.

#14 3 years ago

Put about a dozen games on it. Looks like re-pinning the connectors fixed it.

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