A thrust shaft for a fan has a shaft body with an enlarged disk adjacent one axial end to provide a rotating surface in a pair of thrust bearings. The number of allocated memory spaces is greater than the number of records of a related file. The power bus interconnecting structure includes global power buses in communication with local power buses through programmable vias. The low molecular weight hydrogenated aliphatic resin has a weight-average molecular weight of less than about 2000 gmol. The manufacturing method saves the cost for masks and shortens the manufacturing time. A solenoid receives a variable control input pressure and delivers the control input pressure to the relay valve as a function of a state of the solenoid.