Canon imageRUNNER iR2270 Service Manual page 182

No. T/R
##794 [T]
##795 [T/R]
##796 [T/R]
Description
at time of ECM reception, PPR with all 0s is received.
a fault has occurred in code processing for communication.
a fault has occurred in decoding processing after reception of ECM
Chapter 5
5-9