Canon MF5770 - Manual (Page 48)

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Q Did the receiving fax machine answer within 55 seconds (after all automatic redialing attempts)?
A Contact the other party and have them check their fax machine. For an overseas call, add pauses to
the registered number. (See "Dialing an Overseas Number (With Pauses)," on p. 4-8.)
Q Is the In Use/Memory indicator lighting?
A The In Use/Memory indicator may light, which means the extension phone is busy. Please wait until
the extension phone becomes free.
Faxes sent from the machine are spotted or dirty.
Q Is the sending fax machine working properly?
A Check the machine by making a copy. For more information, see Chapter 5, " Copying, " in the User’s
Guide.
If the copy is clear, the problem may be in the receiving fax machine. If the copy is spotted or dirty,
clean the platen glass or the read area of the platen glass. For more information, see Chapter 8,
" Maintenance, " in the User’s Guide.
Q Is the document loaded?
A Remove the document, stack it if necessary, and place it on the platen glass or load it in the ADF
correctly. For more information, see Chapter 3,
" Document Handling, " in the User’s Guide.
Cannot send using ECM (Error Correction Mode).
Q Does the receiving fax machine support ECM?
A If the receiving fax machine does not support ECM, the document is sent in the normal mode without
error checking.
Errors occur frequently while sending.
Q Are the telephone lines in proper condition? Or do you have a good connection?
A Lower the transmission speed. (See <3. TX START SPEED> of "Menu Descriptions," on p. 8-2.)