I think your optic is working if you are getting the 003 code. the purple wire and yellow with black tracer are the wires that carry the signal back to the cpu board. then the 5vdc is put onto the third wire and sent to the cpu to tell it the door is closed. The pink wire and black wire are just the +5vdc and ground being applied to the emitter optic, the pink wire also jumps to the other board, that +5vdc is sitting there waiting to be transferred through the detector when the beam is blocked by the metal tab, which is moved into place by action of the lock cam movement. This may sound wierd, with the door optic open you would think you could test all the other items, I had to close the door lock (with the door open) and then I was able to test all the buttons and sensors, but the fact that you are getting a 003, the cpu is seeing that sensor as been closed (blocked).
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