Ricoh M001 Service Manual page 85

GAVD communication error
620 B
The machine detects an error data of
the ASIC.
Paper tray unit communication error
Three consecutive errors occur
622
during polling, after the paper tray
unit is successful I2C
communication.
EEPROM Error
The EEPROM was not connected at
669 B
power on, or read/write operations on
the EEPROM failed.
Engine startup error
The BCU failed to respond within the
670 D
prescribed time when the machine is
turn on.
SM
Service Call Conditions
Defective engine board
Defective ASIC
Disconnect harnesses
EEPROM connected
improperly
EEPROM missing
Connections between BCU and
controller board are loose,
disconnected, or damaged
Replace the BCU
Replace the controller board
4-7 M001