Troubleshooting Of Fax Functions - Brother DCP-7030 Service Manual

11.

Troubleshooting of fax functions

■ FAX can't be sent.
User Check
• Verify that the telephone cord is securely connected.
Step
Dial mode
Setting
1
Connection
between main
2
PCB and NCU
PCB
Connection
between main
3
PCB and control
panel PCB
Contact of rubber
4
keys
NCU PCB
5
Control panel
6 PCB
Main PCB
7
Cause
Can a dialing signal (PB
or DP) be heard
normally in each mode?
(Use telephone line
emulator if required.)
Are the main PCB and
NCU PCB connected
correctly?
Are the main PCB and
control panel PCB
connected correctly?
Does the rubber keys
work correctly?
Is the problem solved
after replacing the NCU
PCB ASSY?
Is the problem solved
after replacing the
control panel PCB?
Is the problem solved
after replacing the main
PCB ASSY?
Check Result
Yes
No
No
No
Yes
Yes
Yes
1-53
Remedy
Check the dialing mode
setting at customer's
again. Check the
telephone line cord
between machine and
socket.
Reconnect the connector.
Reconnect the connector.
Replace the rubber Keys.
Replace the NCU PCB
ASSY.
Replace the control panel
PCB.
Replace the main PCB
ASSY.
Confidential