Upon {HEAD ~ the occurrence} of {TAIL ~ a malfunction} in the writer, operation of the image signal generator is continued only until the first to occur of all of the original pages have been stored in the multiple page buffer memory or the multiple page buffer memory is filled 
Upon { HEAD ~ the occurrence } of { TAIL ~ a malfunction } in the writer , operation of the image signal generator is continued only until the first to occur of all of the original pages have been stored in the multiple page buffer memory or the multiple page buffer memory is filled
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH