Phaser 3300MFP Service Manual 4-13General TroubleshootingFax & Phone ProblemsNo Dial ToneWhile Manual Dial button is pressed, there is no dial tone.Defective MF DIALThe MF DIAL is not functioning.NoteProduct supports the MF DIAL type only.Check and Cause Solution1. Check if the telephone line cord isconnected to TEL LINE correctly.1. If the telephone cord is normal butthere is no dial tone, then try to replacethe LIU B'd.2. Check if the Manual Dial button makesCLICK sound when pressed.2. If you cannot hear the Manual DialCLICK sound, the Control PanelAssembly may be defective. Try replacingthe Control Panel Assembly.3. Check the connection of HARNESSbetween the LIU and the Control Board.3. Check the Speaker connection, and tryto replace it.4. Check if the SPEAKER is connectedcorrectly.4. Lastly, try to replace the Control Board.Check and Cause Solution1. Check if the telephone line isconnected correctly.2. While the Manual Dial button ispressed, listen for a CLICK sound.1. If you cannot hear the Manual DialCLICK sound, the Control PanelAssembly may be defective. Try replacingthe Control Panel Assembly.3. Check the connection of HARNESSbetween the LIU and the Control Board.2. If you can hear a CLICK sound, afterchecking the connection of HARNESSbetween the LIU and the Control Board,replace the HARNESS.3. If the problem persists, replace firstthe LIU, then the Control Board.
