Oki OKIOFFICE 84 User Handbook Manual page 83

Make sure that your telephone line (not your external
telephone or handset) is connected to the LINE outlet on the
back of your MFP. 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 MFP 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 MF(TONE)/
DP(PULSE) user function setting in the "Customizing
Features and Operations" section.
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.
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76 Handbook
If 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 Your One Touch Directory").
Your MFP or the remote fax machine may need servicing.
Try sending a fax to another location to check your
machine.
You sent a fax but the image the remote fax machine
received was very poor.
If your document had a lot of small type, complex
illustrations, photos, or was very light or very dark, try
changing your Transmit Resolution and Type of Original
settings (see Loading Documents in the "Basic Faxing
Operations" section). Copy the document on your MFP to see
how it will transmit. The problem may be caused by
telephone line interference. Try sending the document again
later.