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