Centipede Trackball non-functional

/Other/ than the trackball, causes of a Centipede trackball not moving the archer?

* Bad/intermittent GND wiring between the TB and the board.

* Missing +5V from the board to the TB.

* Bad E11 or D11 on the board.
 
* Bad/intermittent GND wiring between the TB and the board.

* Missing +5V from the board to the TB.

* Bad E11 or D11 on the board.

I remember an old RGVAC thread that talked about different resistor values on the Centipede main board that might also cause problems, especially depending on the board revision (ie, earlier board revisions had resistor values that made the operation problematic). Could that be an issue which would cause at least intermittent problems?
 
I remember an old RGVAC thread that talked about different resistor values on the Centipede main board that might also cause problems, especially depending on the board revision (ie, earlier board revisions had resistor values that made the operation problematic). Could that be an issue which would cause at least intermittent problems?

Hmmm. Might be the current-limiting resistors on the TB input on the board? I haven't seen this problem yet. It might be a problem if the +5V at the trackball was low. I am shooting a bit from the hip here without looking at the schematic.
 
Hmmm. Might be the current-limiting resistors on the TB input on the board? I haven't seen this problem yet. It might be a problem if the +5V at the trackball was low. I am shooting a bit from the hip here without looking at the schematic.

Yup, those are the ones. After a little digging, I found that I had copied/pasted the post - lost all the associated info like who posted it, but there's more detail than I gave:

Problem: The track-ball intermittently loses control of the shooter.
Solution: If you have a game with PCB revision A-C, replace R130-R133 with
3.3k resistors. If you have a cocktail game with PCB revision A-C, you must
also replace R83-R86 with 3.3k resistors. If you have a game with PCB
revision D-F, replace R151-R154 with 3.3k resistors. If you have a cocktail
game with PCB revision D-F, you must also replace R143-R146 with 3.3k
resistors. For games with PCB revision G-J, these modifications have
already been made.
 
Does the archer jump or move a little bit at all? Like I said in the other thread... it may be as simple as the encoding wheel rubbing against one side of the reader slot. Good luck:)

It's not mine; it's a service call two hours from here. I wanted to be prepared.
 
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