17 January, 2003
SC TABLE
4-27
SC No.
Item
Definition
Possible Cause
Related
SCs
Troubleshooting Procedure
Type
SC 620
(CF)
ARDF
communication
error
•
After the ARDF is detected,
the break signal occurs or
communication timeout
occurs.
•
Incorrect installation
of ARDF
•
ARDF defective
•
IPU board defective
•
External noise
1. Turn the main switch off and on.
2. Check the cable connection of the
ARDF.
3. Shut out the external noise.
4. Replace the ARDF.
5. Replace the IPU board.
B
SC 621 Finisher/
mailbox
communication
error
SC 622 Bank
communication
error
•
Cable problems
•
BCU problems
•
PSU problems in the
machine
•
Main board problems
in the peripherals
1. Turn the main switch off and on.
2. Check if the cables of peripherals are
properly connected.
3. Replace the PSU if no power is
supplied to peripherals.
4. Replace the BCU or main board of
peripherals.
SC 623 Duplex unit
communication
error
While the BCU communicates
with an optional unit, an SC
code is displayed if one of
following conditions occurs.
1. The BCU receives a signal
which is generated by the
peripherals only just after
the main switch is turned
on.
2. When the BCU does not
receive an OK signal from a
peripheral 100ms after
sending a command to it.
The BCU resends the
command. The BCU does
not receive an OK signal
after sending the command
3 times.
•
Cable problems
•
BCU problems
•
PSU problems in the
machine
•
Duplex control board
problem
1. Turn the main switch off and on.
2. Check if the cable of the duplex
inverter unit is properly connected.
3. Replace the PSU if no power is
supplied to the peripherals.
4. Replace the duplex control board in
the inverter unit.
SC 640 BCU -
Controller
communication
error (check
sum error)
The check sum of the interface
between the BCU and
controller is not the same.
•
Defective controller
•
Defective PCU
1. Turn the main switch off and on.
2. Replace the controller.
3. Replace the BCU.
CTL
SC 641 BCU –
Controller
communication
error (no
response)
The controller does not receive
any response from the BCU
three consecutive times when
sending a signal every 100ms.
•
Loose connection
•
Defective controller
•
Defective BCU
1. Turn the main switch off and on.
2. Check the connection between the
BCU and controller.
3. Replace the controller.
4. Replace the BCU.
CTL