Please note: 
A pull-up resistor pack is not present in the schematic. 
It's RN3, a 5x47K res. pack connected to J2 with the common connected to VCC. 
It is however present on the PCB layout.(See above in Component Placement Layout, near J2 and U16)
 
 
 
 

With questions I can be contacted by email
 
 
 
 

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