Canon Color imageCLASS MF8170c Facsimile Manual page 78

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The machine does not switch automatically between telephone and fax receptions.
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Cannot receive a document manually.
7
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Print quality is poor.
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7-8 Faxing Problems
Is the telephone line connected properly?
Make sure all line connections are secure. (See "Connect the telephone cable,"
in the Set-Up Instructions for the Machine.)
Is the machine set to switch automatically between telephone and fax
receptions?
For the machine to switch automatically, the receive mode must be set to
<AnsMode>. (See Chapter 5, "Receiving Faxes.")
Confirm that an answering machine is connected to the machine and that it is
turned on with an outgoing message properly recorded.
Is the sending fax machine able to send the CNG signal that tells the machine
that the incoming signal is a fax?
Some fax machines cannot send the CNG signal that tells the machine the
incoming call is a fax.
In such cases, you will have to receive the fax manually. (See "Receiving Faxes
Manually: Manual Mode," on p. 5-7.)
Is the machine set to receive manually?
For the machine to receive faxes manually, the receive mode must be set to
<Manual>. (See Chapter 5, "Receiving Faxes.")
Did you press [B&W Start], or dial the remote receiving ID after hanging up the
handset?
Always press [B&W Start], or dial the remote receiving ID before hanging up the
handset. Otherwise you will disconnect the call.
Are you using the correct type of paper?
Make sure you load paper that meets the paper requirements for the machine.
For more information, see Chapter 5, "Copying," in the Basic Guide.
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.