Canon GP160DF Service Handbook page 174

CHAPTER 5 SELF DIAGNOSIS
##0790 [RX] ERR output after EOR-Q reception
• The line condition is poor and frequently the
other party's machine can not properly
receive the image signal.
• The other party's machine malfunctions due
to echo.
##0791 [TX/RX] Signal other than a significant signal received during ECM mode procedure
• Protocol signal abnormality
##0793 [RX] Valid frame can not be detected and the time limit is exceeded during high-
speed signal reception
• The line condition is poor and the other
party's machine can not receive the signal
properly.
• The line condition is poor and the signal
can not be received properly.
• The communication codec is busy.
5-32
Cause
Cause
Cause
Countermeasure
(1) Have the other party's machine's output
level raised so the signal can be received
properly.
(2) Adjust the NL equalizer in #2 MENU
parameter 005, so the other party's
machine can properly receive the image
signal.
• Refer to #1 SSSW-SW03 for echo counter-
measures.
Countermeasure
(1) Record the communication signal on DAT
and analyze it.
Countermeasure
(1) Raise the modem output level in #2
MENU parameter 007, so the other
party's machine can properly receive the
signal.
(2) Adjust the NL equalizer in #2 MENU
parameter 005, so the other party's
machine can properly receive the signal.
(1) Have the other party's machine's status
speed lowered.
(2) Have the other party's machine's output
level raised so the signal can be received
properly.
(1) Turn the power off then on.
(2) Replace the FAX PCB.