Canon GP160F Service Manual page 417

##0675 [RX] Line is released due to T1 time-out when the procedure does not proceed from
phase 3 and phase 4 to beyond the control channel during V.34 transmission
Cause
• The transmitter's line is cut at phase 3 or
phase 4, or the transmitter's signal is not
detected
##0750 [TX] A significant signal is not received and the number of protocol signal re-transmis-
sions is exceeded after PPS-NULL output
Cause
• The line condition is poor and PPS-NULL is
not properly transmitted.
• The line is poor and the signal can not be
received properly.
##0752 [TX] DCN received after PPS-NULL transmission
Cause
• The line condition is poor and PPS-NULL
can not be properly received.
• The stop button was pressed during com-
munications.
COPYRIGHT © 1999 CANON INC.
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CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
Countermeasure
• Prohibit the caller's V.8/V.34 protocol with
#1 SSSW-SW28 Bit 1.
Adjust the output level to a range of -8 to
-15dBm.
Countermeasure
(1) Raise the modem output level in #2 MENU
parameter 007, so the other party's
machine can properly receive PPS-NULL.
(2) Adjust the NL equalizer in #2 MENU para-
meter 005, so the other party's machine
can properly receive PPS-NULL.
(3) Add an echo protect tone to the V29
modem signal in #1 SSSW-SW03 Bit 1.
• Have the other party's machine's output
level raised so the signal can be received
properly.
Countermeasure
• Raise the modem output level in #2 MENU
parameter 007, so the other party's
machine can properly receive PPS-NULL.
• Resend.
13-183