The comparator 92 compares {TAIL ~ the image data}, in units of dot signals, with the reference data supplied from {HEAD ~ the main controller} 71 
The comparator 92 compares { TAIL ~ the image data } , in units of dot signals , with the reference data supplied from { HEAD ~ the main controller } 71
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH