SC TABLE
17 January, 2003
4-28
SC No.
Item
Definition
Possible Cause
Related
SCs
Troubleshooting Procedure
Type
SC 642
(CF)
Communication
timeout error
between
controller and
operation panel
•
The operation panel does
not respond to the frame
sent from the controller.
•
Controller defective
•
Operation panel
defective
•
External noise
•
Harness between
controller and
operation panel
disconnected
1. Turn the main switch off an on.
2. Check the cable connection between
the controller and the operation panel.
3. Shut out the external noise.
4. Replace the controller.
5. Replace the operation panel.
B
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
SC 672
(CF)
Controller-to-
operation panel
communication
error at startup
•
After the machine is
powered on, the
communication between the
controller and the operation
panel is not established, or
communication with
controller is interrupted after
a normal startup.
•
After startup reset of the
operation panel, the
attention code or the
attention acknowledge code
is not sent from the
controller.
•
After the controller issues a
command to check the
communication line with the
controller at 30-second
intervals, the controller fails
to respond twice.
•
Controller stalled
•
Controller board
installed incorrectly
•
Controller board
defective
•
Operation panel
connector loose or
defective
1. Turn the main switch off and on.
2. Check the condition of the controller
board.
3. Check the condition of the operation
panel.
4. Replace the controller board.
5. Replace the operation panel.
B