Troubleshooting Of Fax/Telephone Functions; Fax Can't Send It; Fax Cannot Be Transmitted And Received; No Bell Ring - Brother DCP-7057 Service Manual

3.12 Troubleshooting of FAX/Telephone Functions

3.12.1 FAX can't send it

User Check
• Verify that the telephone cord is securely inserted into the socket.
• Check the dial mode setting again.
Step
Connection between main PCB and
1 NCU PCB
Connection between main PCB and
2 panel PCB
3 Rubber key connection failure
4 NCU PCB failure
5 Panel PCB failure
6 Main PCB failure

3.12.2 FAX cannot be transmitted and received

User Check
• Verify that the telephone cord is securely inserted into the socket.
• Check the reception mode.
• Check if the paper is loaded into the paper tray correctly.
Step
Connection between main PCB and
1 NCU PCB
2 NCU PCB failure
3 Main PCB failure

3.12.3 No bell ring

User Check
• Set a value other than "0" to the number of bell rings.
• Set a value other than "OFF" to the bell volume.
• Check the reception mode.
• Check if the paper is loaded into the paper tray correctly.
Step
Harness connection failure of
1
speaker
Connection between main PCB and
2 NCU PCB
3 Speaker failure
4 NCU PCB failure
5 Main PCB failure
Cause
Cause
Cause
2-100
Remedy
Connect the connector between the main
PCB ASSY and NCU PCB ASSY
correctly.
Connect the connector between the main
PCB ASSY and panel PCB ASSY
correctly.
Replace the rubber key.
Replace the NCU PCB ASSY.
Replace the panel PCB ASSY.
Replace the main PCB ASSY.
Remedy
Connect the connector between the main
PCB ASSY and NCU PCB ASSY
correctly.
Replace the NCU PCB ASSY.
Replace the main PCB ASSY.
Remedy
Check the harness connection of the
speaker and reconnect it.
Connect the connector between the main
PCB ASSY and NCU PCB ASSY
correctly.
Replace the speaker unit.
Replace the NCU PCB ASSY.
Replace the main PCB ASSY.
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