Ricoh G176 Service Manual page 77

Rev. 10/27/2009
651 Communication error – FCI I2C
The engine board detected an unknown
device on the I2C I/F bus (internal bus on
the engine control board).
B
The engine board detected an I2C I/F bus
error.
The number of devices connected to the
I2C bus exceeded 12.
Engine startup error
The BCU failed to respond with the
670 D
prescribed time when the machine
was turned on.
671 Engine board mismatch
⇒
Engine board and controller
mismatch detected.
818 System timeout error
⇒
SM
Service Call Conditions
Engine board defective
Connections between BCU and
controller board are loose,
disconnected, or damaged
Replace the BCU
Replace the controller board
Wrong engine board installed.
Wrong controller board
installed.
Check the type of engine board
and controller board.
1. Replace the engine board.
2. Replace the controller board.
• Defective controller
• Replace the controller if it occurs
frequently.
4-7 G176/G177/G176L