Check the following first.
Make sure that the telephone line settings are properly configured.
Then, see the following sections.
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See the following section:
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Check the setting set for <Restrict History TX>.
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Check the setting set for <Fax No. Confirmation Re-Entry>.
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Use of the optical line is not guaranteed. If the provider guarantees the following two points, however, you can use the optical line without Canon's guarantee.
Telephone speech quality is equivalent to that of general lines.
The line is Super G3 compatible.
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The optical line performs packet communications. If packets are missing or late, the line can temporarily provide audio. There are cases, however, when a communication error occurs as a result of packets missing or arriving late, and fax messages may not be transmitted properly. If error occurs, try to change <TX Start Speed>.
If you continue to experience the problem after changing the speed, contact your provider.
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High-volume documents or sending documents in high image quality may exceed the maximum memory capacity. Set the appropriate image quality and send the document again.
To maintain the quality of a high-volume document, split the document into smaller subsets and send one subset at a time.
If the document contains fine text or photographs, send it directly instead of using a memory transmission.
If the document does not contain fine text or photographs, set the resolution to <200 x 100 dpi (Normal)>.
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Print, send, or delete jobs stored in memory.
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Set a lower image quality. The transmission time can be shortened by setting the resolution to <200 x 100 dpi (Normal)>.
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Make sure that the telephone line is not receiving interference from nearby devices such as a microwave oven.
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Sent faxes print poorly at the receiving fax machine (spotting, size reductions, or contrast problems).
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When a fax printed out by the receiving fax machine has spots
Make a copy on a blank sheet and check to see if there are any spots on the platen glass or feeder's scanning area. Clean the platen glass or feeder's scanning area to remove the spots if necessary. If the sheet has no spots, the receiving fax machine may be the cause of dirty prints.
Make sure that the document is properly placed.
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When a fax printed out by the receiving fax machine is smaller than its actual size
Make sure that the appropriate paper size is loaded in the receiving fax machine's paper tray.
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When the contrast of the printed fax is too light or too dark
Adjust the density setting.
Make sure that the platen glass or feeder's scanning area is clean.
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