Troubleshooting Of Fax Functions - Brother DCP-9045CDN Service Manual

9.

TROUBLESHOOTING OF FAX FUNCTIONS

FAX can't send it.
User Check
- Verify that the telephone cord is securely inserted.
Step Possible cause
Dialing mode
1
Setting
2 Connection
between main
PCB and NCU
PCB
Harness between
3
main PCB and
NCU PCB
Connection
4
between main
PCB and control
panel PCB
5 Harness between
main PCB and
control panel PCB
6 Contact of rubber
key
NCU PCB
7
Control panel
8
PCB
9
Main PCB
Check
Does a dialing signal (PB
or DP) come out normally
in each mode?
(Use telephone line
emulator.)
Are the main PCB and
NCU PCB connected
properly?
Is the harness damaged?
Are the main PCB and
control panel PCB
connected properly?
Is the harness damaged?
Does the rubber key 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?
1-70
Remedy
Result
Yes
Check the dialing mode
setting at customer's
again.
Check the telephone line
cord between machine and
socket.
No Reconnect the connector
properly.
Yes
Replace the harness with
a normal one.
No
Reconnect the connector
properly.
Yes Replace the harness with
a normal one.
No Replace the rubber Key.
Yes
Replace the NCU PCB
ASSY.
Yes
Replace the control panel
PCB.
Yes Replace the main PCB
ASSY.
Confidential