HP LaserJet Enterprise M4555 MFP series - Manual (Page 257)

Faxes are transmitting or being received very slowly.
Cause Solution
The receiving fax machine might have a slow modem speed. The fax accessory only sends the fax at the fastest modem
speed the receiving fax machine can use.
The resolution at which the fax was sent or is being received
is very high. A higher resolution typically results in better
quality, but also requires a longer transmission time. If you are receiving the fax, call and ask the sender to
decrease the resolution and resend the fax. If you are
sending, decrease the resolution and change the
Optimize
Text/Picture option.
If there is a poor phone-line connection, the fax accessory and
the receiving fax machine slow down the transmission to
adjust for errors. Cancel and resend the fax. Have the phone company check
the phone line.
Faxes are not printing on the product.
Cause Solution
There is no media in the media input tray. Load media. Any faxes received while the input tray is empty
are stored and will print after the tray has been refilled.
Schedule Printing of Faxes is set. If Schedule Printing of Faxes is enabled, faxes will not print
until it is disabled.
The product is either low on toner or has run out of toner. The product stops printing as soon as it is low on toner or runs
out of toner. Any faxes received are stored in memory and
print after the toner has been replaced. For other product
printing problems, see the product user guide.
Incoming call may be a voice call. Incoming voice calls usually show up in the call report as a
Communication Error (17) As these are voice calls and
not a fax error, no action is needed to be taken. Ensure that
those calling you have a voice number that is different from
the fax number.
The incoming fax was interrupted. Verify that the fax telephone line does not have an activated
call-waiting feature. A call-waiting notice can interrupt a fax
call in progress, which causes a communication error.
The Fax Printing Schedule feature is set to Always store faxes . Change the Fax Printing Schedule setting to Always print
faxes .
Problems with sending faxes
Problem Cause Solution
Faxes quit during sending. The fax machine to which you are
sending might be malfunctioning. Try sending to another fax machine.
Your phone line might not be working. Disconnect the fax accessory from the
phone jack, and connect a phone. Try to
make a phone call to ensure the phone
line is working.
ENWW Solve fax problems 237