Troubleshooting Of Fax Functions - Konica Minolta bizhub 20 Service Manual

10. TROUBLESHOOTING OF FAX FUNCTIONS

■ Can not send FAX.
<User Check>
- Verify that the telephone cord is securely inserted into the right socket.
Step Possible cause
Dialing mode
Setting
1
Connection
between main
2
PCB and NCU
PCB
Connection
between main
3
PCB and control
panel PCB
Contact of rubber
4
key
NCU PCB
5
Control panel
6 PCB
Main PCB
7
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?
Are the main PCB and
control panel PCB
connected properly?
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?
3-73
Result Remedy
Check the dialing mode
setting at customer's
again.
Yes
Check the telephone line
cord between machine and
socket.
Reconnect the connector
properly.
No
Reconnect the connector
properly.
No
Replace the rubber Key.
No
Replace the NCU PCB
Yes ASSY.
Replace the control panel
Yes PCB.
Replace the main PCB
Yes ASSY.
Confidential