Canon MX520 series Online Manual page 105

Quality of Received Fax is Poor
• Check 1: Check the scan settings of the sender's fax machine.
Ask the sender to adjust the scan settings of the fax machine.
• Check 2: Is ECM RX set to OFF?
Select ON for ECM RX in Adv. communication settings in Advanced FAX settings under FAX
settings.
If ECM RX is enabled, the sender's fax machine resends the fax after correcting errors automatically.
Advanced FAX settings
• Check 3: Is the sender's original document or scanning area of the sender's fax
machine dirty?
The image quality of the fax is mainly determined by the sender's fax machine. Contact the sender and
ask the sender to check whether the scanning area of the fax machine is dirty.
• Check 4: Is ECM transmission/reception enabled although the line/connection is poor,
or is the sender's fax machine compatible with ECM?
• Select ON for ECM RX in Adv. communication settings in Advanced FAX settings under FAX
settings.
Advanced FAX settings
• Contact the sender and ask the sender to check whether the machine is set to enable ECM
transmission.
If the sender's or recipient's fax machine is not compatible with ECM, the fax will be sent/received
without automatic error correction.
• Reduce the reception start speed on RX start speed in Adv. communication settings in
Advanced FAX settings under FAX settings.
Advanced FAX settings
• Check 5: Did you confirm the paper and print quality settings?
Print Results Not Satisfactory
Cannot Receive a Color Fax
• Check: Is ECM RX set to OFF?
If OFF is select for ECM RX in Adv. communication settings in Advanced FAX settings under FAX
settings, the machine cannot receive color faxes. The machine will disconnect the telephone line or
receive color faxes in black & white according to the setting of the sender's fax machine.
Set ECM RX to ON.
Advanced FAX settings
Errors Often Occur When You Receive a Fax
• Check 1: Check the telephone line condition or the connection.
If the telephone line or connection is poor, reducing the reception start speed may correct the error.
Reduce the reception start speed on RX start speed in Adv. communication settings in Advanced
FAX settings under FAX settings.
Advanced FAX settings
• Check 2: Is the sender's fax machine operating normally?
Contact the sender and ask the sender to check whether the fax machine is operating normally.