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