Canon LASER CLASS 730i Service Manual page 240

LASER CLASS 730i/720i/710 Chapter 5: Appendix
3.2.2 Maintenance and service
a) Troubleshooting
Even when a call is received, the bell does not ring.
Solutions:
You cannot hear the dialing sounds from the handset.
Solutions:
There is no response when you dial.
Solutions:
(1) Check that the handset modular jack connector is properly connected to
the handset jack of the fax.
(2) Check that the ring-back tone volume adjustment switch is set to Off.
(3) Replace the handset.
(4) Replace the modular jack board.
(5) Replace the NCU board.
(1) Check that the handset modular jack connector is properly connected to
the handset jack of the fax.
(2) Check that the modular cord from the telephone line is properly
connected to the telephone line jack of the fax.
(3) Check that documents can be transmitted and received normally.
(4) Replace the handset.
(5) Replace the modular jack board.
(6) Replace the NCU board.
(1) Check that user data "TEL LINE TYPE" (TONE/PULSE) is set to the
same type as the telephone line you are using.
(2) Check that the modular cord from the telephone line is properly
connected to the telephone line jack of the fax.
(3) Replace the modular jack board.
(4) Replace the NCU board.
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