The A907 Z-Motor Bundle consists of a new layout of the Z-motor electronics board, 14 pin FFC cable and Head Termination Board. It is a modification that was made to the hardware during early manufacturing of the “A” model machines near the beginning of 2007. Later “A” models we re manufactured, sold & shipped with the A907 already installed. If your machine is a “B” or “C” series machine, it was manufactured with the new A907 design and you do not need the A907 upgrade.

A907 – Identify Z-Motor Pack Version (PDF)