Pololu A4983 Stepper Motor Driver carrier issue

Hi All,
I built a small soldering fixture to solder the headers onto the carrier as well as a test circuit to test the stepper in forward and reverse mode. While all test out fine in my test circuit, some, but not all work when installed in the Ultimachine RAMPS 1.4 shield. Anyone else run into this situation? See enclosed Pictures.

Edited 2 time(s). Last edit at 10/04/2011 05:46PM by librav.

Followup,
The one element that is different from my test circuit and the RAMPS circuit is the RAMPS circuit has a 10K resistor from the A4983 Enable pin to Vcc. The spec sheet indicates to enable the device this pin should be either open or low. The 10k resistor seems to hold this pin somewhere in between high and low. Should this resistor be going to gnd and not Vcc? Comments???? When I insert this resistor into my test circuit it behaves like the RAMPS shield. The motor doesn't run. When I remove the resistor the motor runs. Is there another reason or purpose for this 10k resistor? Comments????
Librav

The enable should be connected to a pin on the Arduino and the firmware should drive it low to enable the motor. The resistor ensures the motors are disabled before the firmware runs.

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[www.hydraraptor.blogspot.com]

Thanks nophead,
The RAMPS schematic has it going to Vcc. I wonder why they didn't pin it out to the Arduino? Upon looking further, the axis enable pins do continue on to the Arduino. Right on nophead!

Edited 1 time(s). Last edit at 10/05/2011 11:40AM by librav.