# Troubleshooting from error code

Dial tone can not be detected when dialing.

• Plug in the phone and check for a dial tone, continuous tone, or intermittent tone from the switch.
• PSTN or PBX line? For a PBX line, change the connection line setting to PBX and try.
• If you can hear the dial tone but cannot detect it, record it and check the signal.
  Perform the detection adjustment in the FAX Maintenance Mode.
  The setting of dial tone detection = off should be avoided as much as possible, since there is a risk of erroneous connection.

Line voltage was present before making a call (when on-hook), but lost when calling (when off-hook).

Check that the LINE and EXT. Ports are not connected in reverse, and that the telephone line is connected.

No line voltage before calling.

• Check that the telephone line is correctly connected to the LINE port.
• Connect your phone, hear a dial tone and see if you can dial and place a call.
• Check the line voltage with a tester. (DC48V when on-hook)

Busy tone detected when dialing.

• Check that the phone number is correct.
• Check if another signal is incorrectly detected as a busy tone.
  If a false detection has been made, record the signal and check for the false detection.
  Turn off the busy tone detection function or adjust the detection method in FAX Maintenance Mode.

Fax signal from destination machine cannot be detected after dialing.

• Check that the phone number is correct.
• Check if the fax signal is returned from the other party.

A communication error occurred after connecting the line.

• Output the communication management report and check the error occurrence status.
  In a fax using a subscribed telephone line, a communication error may occur if the state of the grasped telephone line is poor, and if redialing is performed by automatic redial, a good telephone line can be grasped and normally sent.
  If there are extremely many communication errors, it is checked whether the error has occurred at a specific destination or whether there is any tendency such as a time zone.
  For the trend survey, multiple communication management reports are required, so it is necessary to print out the communication management report automatically and ask the customer to leave it for a while instead of discarding it for a while.
• Output the protocol monitor log of the communication at the time of error occurrence and investigate where in the communication the error occurred.
  In the FAX Maintenance Mode, select the "Error only" or "Auto print" option as needed.
• Obtain communication recording data at the time of error occurrence and investigate the error occurrence status.