Gestetner B147 Service Manual page 233

SC No. Item
SC 640 BCU - The check sum of the interface
Controller between the BCU and
communication controller is not the same.
error (check
sum error)
SC 641 BCU – The controller does not receive
Controller any response from the BCU
communication three consecutive times when
error (no sending a signal every 100ms.
response)
SC 670 No response When the main power is
from BCU at turned on or the machine
power on starts warming up from
energy-saving mode, the
controller does not receive a
command signal from the
BCU.
SM
Definition Possible Cause
• Defective controller
• Defective BCU
• Loose connection
• Defective controller
• Defective BCU
• Loose connection
• Defective controller
• Defective BCU
Related
Troubleshooting Procedure
SCs
1. Turn the main switch off and on.
2. Replace the controller.
3. Replace the 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.
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.
4-31
SC TABLE
Type
CTL
CTL
CTL
B147/B149/B190