SC Tables: SC6xx
SM 4-21 G179
Trouble-
shooting
Loose connector
The accounting device sends the controller the report that indicates the
battery voltage error has occurred.
Defective controller of the MF accounting device
Battery error
BCU communication error
The BCU does not respond to the frame transmitted from the controller.
641
CTL
B
Defective controller
Detective BCU
EEPROM error
Retry of EEPROM communication fails three times after the machine has
detected the EEPROM error.
669 D
Caused by noise
Engine startup error
The BCU fails to respond with the prescribed time when the machine is
turned on.
670
CTL
D
Connections between BCU and controller board are loose,
disconnected, or damaged
1. Replace the BCU
2. Replace the controller board
BCU error
The model code from the BCU is not correct when the machine is turned
on.
671
CTL
D
Install the correct BCU for this model.
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