Oce 3121 Technical & Service Manual page 175

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