HP Color LaserJet Enterprise CM4540 MFP series - Manual (Page 281)

Service settings
These items in the control-panel menus can help with troubleshooting if the corrective action taken under
the Error Codes section is unsuccessful. They are intended to be used when an HP service
representative is assisting you.
Settings in the Troubleshooting menu
Open the Administration menu, and then select the Troubleshooting menu.
Troubleshooting menu settings T.30 Trace: The T.30 trace is a printed report which
produces a record of all the communications between the
sending and receiving fax machines for the last Fax
transmission or reception. The report has many technical
details which are usually beyond the scope of most users.
However the report contains detailed error codes and other
information that might be useful in troubleshooting a particular
problem related to sending or receiving a FAX. The report
contents might be requested by an HP service representative
when trying to determine the cause of a problem and will help
to determine the appropriate action.
Transmit Signal LossTransmit Signal Loss : This selection
compensates for phone line signal loss. It is not recommended
to modify this setting unless requested to do so by an HP
service representative as it might render the fax inoperable.
V34 : This setting has two values (Normal and Off) that control
the modem's baud rate. The Normal setting allows the modem
to select (negotiate with the other modem) any of the
supported baud rates up to 33,600 bps. The Off setting sets
the baud rate to 14,400 bps. This setting remains set, until
changed.
Speaker Mode : This service setting has two modes, Normal
and Diagnostic. In Normal mode, the modem speaker is
turned on during dialing through the initial connection and
then shuts off. For Diagnostic mode, the speaker is turned on
and remains on for all fax communications until the setting is
returned to Normal.
Settings in the Resets menu
Open the Administration menu, and then select the Resets menu.
Resets menu settings Restore Factory Telecom Settings or Restore Default Telecom
Settings : This selection resets several menu changes back to
their default settings. This includes the maximum baud rate,
ring-burst off time, V.34, speaker mode, and transmit signal
loss.
ENWW Solve fax problems 261