Ricoh M052 Service Manual page 428

SBU connection error
144 D
Connection to the SBU could not be confirmed, possibly due to a defect in
the BICU detection port.
Harness connection at BICU or SBU loose, broken, defective
BICU defective
SBU defective
IPU Error 1
161
D
The self-diagnostic test detected an error at the BICU at power on, or after
-001
the machine returned from energy save mode.
Harness between SBU and BICU loose or broken
BICU defective
SBU defective
IPU Error 2
161
D
-002
The machine does not detect RI answer from BICU.
Harness between SBU and BICU loose or broken
BICU defective
SBU defective
Copy Data Security Unit error
165 B
An error occurred when the machine attempted to recognize the Copy
Data Security Unit board.
Check installation of Copy Data Security (CDS) Unit
CDS unit not correct type for the machine
CDS unit defective
SM 6-5
Service Call Conditions
M052/M053/M054