Konica Minolta bizhub 20 Service Manual page 149

■ Speed dialing and One-touch dialing can't be used.
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
Speed dialing
keys or one-
7
touch dialing
keys
■ Can not receive FAX.
<User Check>
- Verify that the telephone cord is securely inserted into the right socket.
Step Possible cause
Receive mode
1 setting
NCU PCB
2
Main PCB
3
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?
Is the problem solved
after replacing the
rubber key?
Is the problem solved
after replacing the NCU
PCB ASSY?
Is the problem solved
after replacing the
control panel PCB?
Can a fax transmission
be made using the
numeric keys?
Check
Is the receive mode set
to automatic receive
mode?
Is the problem solved
after replacing the NCU
PCB ASSY?
Is the problem solved
after replacing the main
PCB ASSY?
3-74
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.
Yes
Replace the NCU PCB
Yes ASSY.
Replace the control panel
Yes PCB.
Replace the main PCB
ASSY.
Yes
Result Remedy
Set the receive mode to
No automatic receive mode.
Replace the NCU PCB
Yes ASSY.
Replace the main PCB
Yes ASSY.
Confidential