Upon {HEAD ~ the occurrence} of {TAIL ~ a malfunction} in the signal generator, operation of the writer is continued until the next page to be written has not been stored in the buffer memory 
of
Upon { HEAD ~ the occurrence } of { TAIL ~ a malfunction } in the signal generator , operation of the writer is continued until the next page to be written has not been stored in the buffer memory
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