F. means, operative upon the occurrence of a malfunction in said signal generating means for continuing operation of said writer means until the writer is ready to form {HEAD ~ images} of a page in {TAIL ~ the predetermined sequence} which page has not yet been stored in said buffer memory 
in
F. means , operative upon the occurrence of a malfunction in said signal generating means for continuing operation of said writer means until the writer is ready to form { HEAD ~ images } of a page in { TAIL ~ the predetermined sequence } which page has not yet been stored in said buffer memory
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH