Join Date: Feb 2006
Location: Indianapolis, IN
As long as the FI warning is on, you won't have optimal performance.
Open circuits on the k6 and newer are different from the k5 and older models. The manufacturer of the stepper motor changed the design, but introduced another flaw. The winding leads come straight up and make a 90 degree bend to the solder pool on the PCB. On the previous design, they had a loop around the support posts and allowed them to flex. This new design has no flex and the wires fatigue right at that 90 degree bend and break. It's not a common failure, but of the 06 and newer units with an open circuit, this has been the case for all but one. The real nut buster is that the one that usually breaks is on the start of the winding and you can't pull out any slack. They're fixable, but we're talking a high skill level to even attempt it. The wire is tiny, coated, and you only have about 3-4mm to work with.