Troubleshooting > 128
F
AX
PROBLEM
CHECKLIST
(MB470/MB480)
If a problem occurs, read through the list of problems and solutions before calling for
service.
The MFP will not dial a telephone number. Check the power cable and wall outlet. Make
sure that the telephone line (not external telephone or handset) is connected to the LINE
socket on the back of the machine. If an external telephone is installed, lift the handset and
check for a dial tone. If there is no dial tone, there may be a problem with the telephone
line. If there is a dial tone, the MFP may be using the wrong dialling method (pulse or tone)
for the region. If alternating tones are heard instead of dialling pulses and the region uses
pulse dialling, change the call parameters (see “MF(Tone)/DP(Pulse)” on page 45).
The display shows a communications error. This indicates any of a number of problems:
> The MFP may be incompatible with the remote machine, or the remote machine may
not be able to perform the function requested of it such as polling or confidential
faxing.
> 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 that the correct telephone number is being dialled.
> If a prefix number must be dialled to get an outside line, or if the call is to an
international destination, a pause may need to be entered after the dial prefix or
international dialling code to tell the machine to wait for a dial tone. If there are
frequent problems communicating with a particular remote machine, try
programming the telephone number into a speed dial key, and then change the
parameters for that key.
> Lastly, either the local or remote machine may require servicing. Try sending a fax
to another location to check the local MFP.
Faxing is possible but the image of the document printed by the remote machine
is very poor. If the faxed document has small type, complex illustrations, photos, or is
very light or very dark, try changing the fax quality and density settings (see “Density” on
page 40). Copy the document on the machine to determine how it will transmit. The
problem may be caused by telephone line interference. Try sending the document again
later.
Fax sent but received message was completely blank. Make sure that the document
is loaded correctly before faxing; with text face UP in the ADF or face DOWN on the glass.
Image of received fax is very poor. Try making a copy of a document on the local
machine to make sure it is working properly. If there is still a problem, contact the person
sending the fax and ask them to change their fax quality and density settings. Ask the
person to make a copy of the document on their machine to ensure that it is working
properly. Then ask them to send the fax again.
Dialling was tried with a Speed Dial/ Group Dial number but nothing happened.
Make sure that the Speed Dial/ Group Dial number being used is programmed
correctly.When dialling a two or three digit number, be sure press # or * before entering
the number.
Documents received are light or have vertical streaks on them, and MFP is not out
of toner. Lift the top cover and gently wipe the lens surface of the MFP’s LED array. Then
check to see if the toner or image drum need replacing (see “Replacing consumable items”
on page 109).
MFP is set for delayed transmission but it did not send. Check the display to make
sure that the MFP is set to the correct time and date (see “Clock Adjustment” on page 44).
MFP is connected to a PBX but it is not possible to dial out. Be certain that the dial
prefix is entered before the telephone number for each number dialled or programmed into
