Service manual
SC TABLE
SM 4-25 G130/G131
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
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 680 BCU/ MUSIC
communication
error
After the engine CPU sends a
message, the Music CPU does
not respond within five seconds
three consecutive times.
• Toner cartridge
memory chip loose
connection
• Memory chip problem
• Memory chip cable
wiring problem
1. Turn the main switch off and on.
2. Check if the toner cartridge is
installed correctly.
3. Replace the toner cartridge.
4. Check if the harnesses are not
damaged.
5. Replace the BCU.
D
SC 687 Memory
address
command error
The BCU does not receive a
memory address command
from the controller 120
seconds after paper is in the
position for registration.
• Loose connection
• Defective controller
• Defective BCU
1. Turn the main switch off and on.
2. Check if the controller is firmly
connected to the BCU.
3. Replace the controller.
4. Replace the BCU.
D
SC 690 GAVD
communication
error
690-001: Y
690-002: M
690-003: C
690-004: K
The register test of the GAVD
fails.
• Loose connection
• Defective BCU
• Defective LD controller
board
1. Turn the main switch off and on.
2. Check the cable connection.
3. Replace the laser optics-housing
unit.
4. Replace the BCU board.
D
SC 692
• GAPCI2C
communicati
on error
• The I2C bus device ID is not
identified during initialization.
• A device-status error occurs
during I2C bus
communication.
• The I2C bus communication
is not established due to an
error other than a buffer
shortage.
• Loose connection
• Defective BCU
• Defective LD controller
board
1. Turn the main switch off and on.
2. Check the cable connection.
3. Replace the BCU.
D