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