Oki OKIFAX 5900 User Handbook Manual page 100

Your documents jam.
Check the document for wrinkles, tears or other damage.
Make sure there are no staples or paper clips and that the
paper is clean and dry.
Make sure the document is not wider than your machine
can load.
Try making a copy of the document on a photocopier and
faxing the copy.
Your machine won't dial.
Check the power cord and wall outlet.
Make sure that your telephone line (not your external
telephone or handset) is connected to the LINE outlet on the
back of your machine. If you have an external telephone
connected, lift the handset and check for a dial tone. If you do
not hear one, there may be a problem with your telephone
line. If you do hear a dial tone, your machine may be using
the wrong dialing method (pulse or tone) for your area. If you
hear changing tones instead of dialing pulses and you know
that your area uses pulse dialing, refer to the TONE/PULSE
(MF/DP) user function setting in the Setting Basic Features
section.
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92 Handbook
The display shows a communication error.
This alarm indicates any of a number of problems:
You may be trying to communicate with an incompatible
fax machine (your machine can only communicate with
ITU-T Group 3 fax machines).
The remote machine may not be able to perform the
function that you want, such as polling or confidential
messages.
The remote machine may also be out of paper or
experiencing a paper jam.
Bad telephone line conditions can also cause
communication errors. Try sending the fax again and
check to make sure you are dialing the correct telephone
number.
You have to dial a prefix number to get an outside line,
or if you are dialing internationally, you may need to
enter a pause (using the Pause One Touch key) after the
dial prefix or international dialing code to tell your
machine to wait for a dial tone.
If you have frequent problems communicating with a
particular remote fax machine, try programming the
number into one of your One Touch keys and then
changing the One Touch Parameters for that One Touch
key (see "Programming Speed Dial Numbers").
Your machine or the remote fax machine may need
servicing. Try sending a fax to another location to check
your machine.