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So, I cut the trace leading to the extra signal line. You can see the cut just above the top-right of the HEF40175B. The output was originally connected to pin 2. I determined that a nearby resistor was connected directly to pin 9 (the clock) so I then added a piece of blue wire wrap wire from that resistor to the unused channel pin. Bigger...
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Copyright 2006 by Dave Hylands