Um, the schematic you were using has the endstops wired to the RAMPS max endstop headers, and the probe to the Z min endstop header. The printrboard does not have both max and min endstop headers. You have to define the pins as one or the other. So where did you wire the probe to on the printrboard? You could use the unused E endstop header and define that as the min Z endstop in the pins.h file. Or you could use the expansion header pins to do the same thing, although the E endstop is more convenient.
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