Service manual

SC TABLE 30 July, 2001
4-24
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 621
Finisher/mailb
ox
communicatio
n error
SC 622
Bank
communicatio
n 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
communicatio
n 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
communicatio
n 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
communicatio
n 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
SC 670 No response
from BCU at
power on
When the main power is
turned on or the machine
starts warming up from
energy-saving mode, the
controller does not receive a
command signal from the
BCU.
• 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