(Topic ID: 313036)

Dr Who - Mini Playfield issue

By dipasqut

1 year ago


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#19 1 year ago

dipasqut you mentioned you reattached the motor wire. Did you re-attach both red and black? Is it possible you attached them backwards? I got similar CW/CCW errors when I attached the red wire to the red dot side of a new motor. Once I switched sides of the wires on the motor, my errors went away. The next question is, where did you buy your Optos? Many here have had issues with Optos bought at Marcos. Esp. for the 5 Opto mushroom targets. In the video, I saw an error for Opto #74, which is in the 5 opto bank of mushrooms. Also, I saw in the video how in test that the MPF levels are off. This also speaks to the beam being broken by the cam at the wrong time. Which is either that your cam has slipped on the shaft of the motor/gear box or you are running reverse polarity to the motor. I have also had the speaker wires grab my wires after a repair and can relate. I have included 3 pictures of the wiring to the motor and Optos. You can see in the last picture how the Optos shoot a beam across when the cam has an opening.

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#31 1 year ago
Quoted from eyeamred2u:

Have you moved from J207 to J206 and J209 to 208? Just curious.

I just did that move on my working game when I installed the new DumbAss CPU board. The connectors were labeled wrong compared to the manual. But it made no difference. They are electrically the same top and bottom.

#50 1 year ago

Another lesson learned from Pinside. I will add this to my MS Word document of problems and fixes. thanks.

#54 1 year ago
Quoted from pinballinreno:

Case in point:
I spent a week solving a thing flips opto on my TAF.
Everything worked yet nothing worked.
It ended up that the prior repair person had accidently soldered the Rx opto wires in reverse.
This causes the opto to work, but be very weak.
The opto pair would only register if they were physically touching.
They would fail if they were 1/8" apart.
Once the wires were correctly installed, it worked perfectly.
I found the solution on pinside!

So you are saying that there is a right way and a wrong way to wire an Opto (esp. the RX reciever side).

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