Canon FaxPhone L170 Basic Manual page 150

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Faxed images are blotched or uneven.
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Cannot receive a fax using ECM (Error Correction Mode).
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Errors occur frequently while receiving.
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13-16 Faxing Problems
Is any toner left in the cartridge?
Replace the cartridge with a new one. For more information, see "Installing/Replacing the Toner Cartridge," on p. 2-16.
Select <KEEP PRINTING> in <TONER SUPPLY LOW> in <FAX SETTINGS> of the Menu. With this setting, the machine
will not store documents in the memory even if the toner has run out.
(See "2.TONER SUPPLY LOW," on p. 15-11.)
Is the correct paper loaded in the cassette?
Make sure paper is loaded in the cassette. For more information, see Chapter 4, "Paper Handling."
Load the correct paper size or change <PAPER SIZE> in <PAPER SETTINGS> of the Menu. For more information see
Chapter 4, "Paper Handling," or Chapter 10, "Making Copies."
Are the telephone lines in proper condition? Or do you have a good connection?
ECM (Error Correction Mode) for sending/receiving should eliminate such problems. However, if the telephone lines are in
poor condition, you may have to try again. Then call the sender to resend the document.
Is the sending fax machine functioning properly?
The sending fax machine usually determines the fax's quality. Call the sender and have them make sure the scanning glass
of their fax machine is clean.
Does the sending fax machine support ECM?
If the sending fax machine does not support ECM, the document is received in the normal mode without error checking.
Is the sending fax machine functioning properly?
Call the sender and have them check that their fax machine is functioning properly.