Chase HQ/SCI, optical wheel pinout?

AE35

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Hi guys

On the optical wheel board in my SCI, I have four leads - Red, Yellow, Orange, Brown.

Can anyone tell me which lead is what? It looks like one of the connectors from a Hantarex chassis has been used for this. Even the colors for the leads suggests this?

Thanks,

Nicholas
 

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It's +5v, ground, and the two outputs with red and black for those first two, so I would agree that is not original. Not confident enough to say which are which, sorry, but left to right it usually starting with +5v and then ground so do some multimeter measuring.
 
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