I have an HL-90 optical scanner mounted on an ESAB silhouette 1000 plasma cutting table. I seem to be experiencing two separate issues. First my x-axis drive motor has been moving slowly then recently it would occasionally stop operating in one direction. Upon switching x and y axis motors to troubleshoot the problem, I found that my x-axis motor still performed slowly on the y-axis circuit but worked in both directions, however the y-axis motor worked intermittently, but at full speed when it did function. So it seems I have one failed x-axis drive motor and a drive circuit issue.
I'm trying to find the motor, the pittman site has been useless so far, i did find a service bulletin stating that spade terminals where no longer an option, but still can't find the exact motor. I've found a GM9434 that is similar but just has the large body motor, and not the secondary motor part thing on back.
My motors are :
Pittman
GMT9434F832
51022
24VDC 38.3:1 Ratio
11-20-95
Second, I'm looking for a testing procedure to check to make sure the output to the motor is correct.
What i have done/found so far:
Checked voltage coming out to the leads, everything is 24V, not sure how the system works, if it adjusts amperage or sends pulses or uses that secondary motor thing to govern speed.
Took a IR gun to see if any part of the circuit board was overheating. found that one of four small black boxes on the board that seem to correlate with the direction of travel would run about twice as hot(160 degrees F) as the other 3 when the faulty motor would turn, but not when it wouldn't turn.
Took the motor apart and checked for signs of worn brushes, overheating, wear, etc i did not do any resistance checks.
Any help would be very appreciated.