The Service Manual of the Xerox Phaser 3117 provides a System Timing Chart for A4 format, but I strongly recommend get the timing from the real circuit helped by an oscilloscope. ![]() The printer detects the paper and follow up the whole printing process using simple IR sensors that provide digital information to the main board, so in order to keep the original control system we should find the way to provide the same information that the IR sensors, we are talking about the timing in the signals that IR sensors provide. I divided this conversion in the follow stages: ![]() Since the printer is making what we want (put toner into a surface) we just have to change the surface type (PCB instead paper). The strategy is perform a minimum intervention to the printer.
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