Troubleshooting Of Fax Functions - Brother FAX-2820 Service Manual

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Troubleshooting of fax functions

F-1
User Check
(1) Verify that the telephone cord is securely inserted.
Possible cause
Dialing mode
setting
Connection
between main
PCB and NCU
PCB
Harness between
main PCB and
NCU PCB
Connection
between main
PCB and control
panel PCB
Harness between
main PCB and
control panel PCB
Contact of rubber
key
NCU PCB
Control panel PCB
Main PCB
FAX can't send it.
Check
Step
1 Dialing signal (PB or
DP) comes out
normally in each mode.
(Use telephone line
emulator.)
2 Main PCB and NCU
PCB are properly
connected.
3 Harness is damaged.
4 Main PCB and control
panel PCB are properly
connected.
5 Harness is damaged.
6 The rubber key works
correctly.
7 Replacement of NCU
PCB solves the problem.
8 Replacement of control
panel PCB solves the
problem.
9 Replacement of main
PCB solves the problem.
Result
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 Replace the rubber key with a
normal part.
Yes Replace the NCU PCB with a
normal part.
Yes Replace the control panel PCB
with a normal part.
Yes Replace the main PCB with a
normal part.
9 -5 7
Remedy
Confidential