Brother DCP 8040 - B/W Laser - All-in-One Service Manual page 234

F-2 Speed dialing and One-touch dialing can't be used.
Possible cause Step
Speed dialing, 1
One-touch
dialing
Dialing mode 2
setting
Connection 3
between main
PCB and NCU
PCB
Harness 4
between main
PCB and NCU
PCB
Connection 5
between main
PCB and control
panel PCB
Harness 6
between main
PCB and control
panel PCB
Connection of 7
FPC key
FPC key 8
NCU PCB 9
Control panel 10
PCB
F-3 FAX can't be received.
User Check
(1) Verify that the telephone cord is securely inserted.
Possible cause Step
Receive mode 1
setting
NCU PCB 2
Main PCB 3
Check
A fax transmission can be
made using the key, ten?
Dialing signal (PB or DP)
comes out normally in each
mode.
(Use telephone line emulator.)
Main PCB and NCU PCB are
properly connected.
Harness wire is damaged.
Main PCB and control panel
PCB are properly connected.
Harness wire is damaged.
FPC key is properly
connected.
Replacement of FPC key
solves the problem.
Replacement of NCU PCB
solves the problem.
Replacement of control panel
PCB solves the problem.
Check
Receive mode is set to
automatic receive mode.
Replacement of NCU PCB
solves the problem.
Replacement of main PCB
solves the problem.
6-31
MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN
Result Remedy
Yes Replace the main PCB.
Yes Check the dialing mode
setting at customer's again.
Check the telephone line
cord between machine and
socket.
No Fix the connection properly.
Yes Replace the harness with a
normal part.
No Fix the connection properly.
Yes Replace the harness with a
normal part.
No Fix the connection properly.
Yes Replace the FPC key with a
normal part.
Yes Replace the NCU PCB with
a normal part.
Yes Replace the control panel
PCB with a normal part.
Result Remedy
No Set the receive mode to
automatic receive mode.
Yes Replace the NCU PCB with
a normal part.
Yes Replace the main PCB with
a normal part.
SERVICE MANUAL