The magnetic field produced by {HEAD ~ the coil} of the stepper motor interferes with the capability of {TAIL ~ the readhead} to recognize the magnetic indicia on the check 
The magnetic field produced by { HEAD ~ the coil } of the stepper motor interferes with the capability of { TAIL ~ the readhead } to recognize the magnetic indicia on the check
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH