Ricoh D009 Service Manual page 125

The machine will issue an SC165 error if the machine is powered on with the
ICIB-1 removed and the "Data Security for Copying" feature is set to "ON".
When you remove this option from the machine, first set the setting to "OFF"
with the user tool before removing this board. If you forget to do this, "Data
Security for Copying" feature cannot appear in the user tool settings. And then
SC165 will appear every time the machine is switched on, and the machine
cannot be used.
5. Make sure that the machine can recognize the option (
the end of this section).
SM
Copy Data Security Unit
Check All Connections at
2-79 D009/D011/D012/D013/D091/D092