Oce 3121, Technical & Service Manual

Page: 175 / 908

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ed.2 Trouble shooting 67
##750 (trans) The appropriate signal could not be received, after transmitting
PPS-NULL during ECM transmission. And, the number of times that the protocol
signal was transmitted exceeded the limit.
Main cause Action
■
The line condition is poor. Preventing trans-
mission of PPS-NULL.
■
The line condition is poor. Preventing cor-
rect reception of signals.
■
Increase the level of transmission of the mo-
dem, using parameter 07 of #2 MENU. Per-
mitting correct receipt of the PPS- signal.
■
Adjust the NL equaliser, using 05 of #2
MENU. Permitting correct receipt of the
PPS-NULL signal.
■
Attach EPT to the V29 modem signal, using
bit 1 on SW03 of #1 SSSW.
■
Ask the other party to increase the level of
transmission, permitting correct receipt of
the signals.
##752 (recep) DCN has been received, after transmitting PPS-NULL during ECM
transmission.
Main cause Action
■
The line condition is poor. Preventing cor-
rect reception of the PPS-NULL signal.
■
Stop has been pressed during communica-
tion.
■
Increase the level of transmission of the mo-
dem, using parameter 07 of #2 MENU. Per-
mitting correct receipt of the PPS-NULL
signal.
■
Try transmission once again.
##753 (trans) T5 time out (60 seconds) has occurred. Or, the number of times the
protocol signal has been sent has exceeded the limit in ECM transmission after
transmitting PPS-NULL.
Main cause Action
■
The page buffer of the other machine is full
or busy. The RNR cannot be received cor-
rectly, after transmitting PPS-NULL, and
the appropriate signal cannot be received
correctly after transmitting RR.
■
Increase the T5 timer setting, to avoid an er-
ror.
■
Change the ECM frame size: from 256 bytes
to 64K bytes.