(Topic ID: 299146)

Pinbot; no Knocker

By bigjimm64

2 years ago



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  • 5 posts
  • 2 Pinsiders participating
  • Latest reply 2 years ago by KJL
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#2 2 years ago
Quoted from bigjimm64:

Maybe it would help if someone would explain how to read the wire color and connections diagram.

Orange is probably power and should always be on in game if that side of the relay is connected. The black brown and violet brown wires are the wires the transistor connects to ground when the CPU decides to fire the solenoid/flasher. So the solenoid/flasher always has power and then fires when connector to ground.

When they tell you a wire color it should be the drive/ground wire on the coil (not power) and go to the connector on the board usually. But in this case where one transistor drives 2 solenoids/transistors the color at the coil isn't always the color at the board as it has to connect to 2 wires.

I haven't had to fix this AC select issue in a few years but you noted that one transistor controls 2 solenoids the A side and the C side. Usually cols that are used a lot are on the A side and things like flashers and knockers that don't impact game play if they are late are on the C side.

The CPU fires the AC Select transistor to switch between the A side and C side then fires the same transistor but when the relay is on the C side is connected to Edit It connects the C side (orange) to power instead of the A side Power

Do any of the solenoids/flashers that are on the C side work? If yes trace the black brown to see if it is broken somewhere.

If not, suspect the relay or its controlling circuit. You should hear the relay click in solenoid test also. Look for the AC Select relay in the solenoid table and listen for a click when its number comes up.

Interesting that the GI dims when the knocker should fire. GI can also be controlled by relays but I don't know Pinbot to say whats going on there. Feel free to ask more questions.

#4 2 years ago

@bigjimm64

You should be able to put it into test and check power when the out hole is selected for test and test power when the knocker is selected for test. If the knocker has power then you can ground to test if the coil works.. Also pinwiki has good stuff. https://www.pinwiki.com/wiki/index.php?title=Williams_System_9_-_11

For diode orientation on the coil the band is to the power lug. If you have the diodes on a board check the schematic. It will also show you the path to ground to test if the coil works. Here is an example from a game I have on my computer.
A C Select (resized).pngA C Select (resized).png

#5 2 years ago

I now looked at the schematic and it looks like power is what is switched by the relay so I have faulty memory. Check that out in your manual. A side should have power by default and C side gets switched by the relay. See if that looks right.

Edit: I updated my previous post to be more clear how you can test the A side or the C side because normally the A side has the power when the relay is not engaged.

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