Canon fax-phone b740 Manuel

Troubleshooting

Chapter 13

■ The copier/fax does not switch automatically between telephone and fax reception.

The copier/fax may not be set to switch automatically between telephone and fax
reception.
• For the copier/fax to switch automatically, the receive mode must be set to 

Fax/Tel

Mode

, 

ANS.MACHINE MODE

, or 

DRPD

(

1

Chapter 8, Receiving Faxes). If you

have set 

ANS.MACHINE MODE

, confirm that an answering machine is connected to

the copier/fax and that it is turned on with an outgoing message properly recorded.
(

An error may have occurred during reception.
• Check the LCD for an error message. (

• Print an Activity Report and check for an error. (

The multi-purpose tray may be empty.
• Make sure paper is loaded in the multi-purpose tray. (

The sending fax machine may not send the CNG signal that tells the copier/fax
that the incoming signal is a fax.
• Some fax machines cannot send the CNG signal that tells your copier/fax the

incoming call is from a fax machine. In such cases, you will have to receive the fax
manually. (

■ Cannot receive a document manually.

You may have disconnected the call by pressing Start or dialing the remote
receiving ID after hanging up the handset of the extension phone.
• Always press Start or dial the remote receiving ID before hanging up the handset.

Otherwise you will disconnect the call.

■ Print quality is poor.

You may not be using the correct type of paper.
• Make sure you load paper that meets the paper requirements for the copier/fax. 

The BJ cartridge print head may need cleaning.
• Refer to the flow chart (

p. 12-8) and clean the BJ cartridge print head if necessary.

The sending fax machine may not be functioning properly.
• The sending fax machine usually determines the fax’s quality. Call the sender and

have them make sure the top cover and scanning glass of their fax machine are clean.

Error Correction Mode (ECM) may be disabled.
• Make sure ECM is on. (

■ Faxes do not print.

The orange protective tape may not be removed from the BJ cartridge.
• Be sure to remove the orange protective tape from the BJ cartridge before you install