Ricoh D009 Service Manual page 341

SBU: Black Level Loop (CS model only)
Displays the black level adjustment time for each mode.
4640
The black level adjustment is done twice. The 1st adjustment decides the
reference value for the 2nd adjustment.
001 Loop Count (1st): Color
002 Loop Count (1st): B/W
003 Loop Count (2nd): Color
004 Loop Count (2nd): B/W
SBU: White Level Loop
4641
Displays the white level adjustment time for each mode.
001 Loop Count: Color
002 Loop Count: B/W
SBU: Time-out Error
4646
Displays the result of the AGC adjustment.
001 Black Level Adjustment 1
002 Black Level Adjustment 2
003 White Level Adjustment
SBU Error
Displays the result of the SBU connection check.
4647
Power-On
SM
[0 to 20 / 0 / 1 ]
[0 to 20 / 0 / 1 ]
[0 to 1 / 0 / 1 ]
0:OK, 1: AGC adjustment failure
[0 x 0000 to 0 x 003F / 0 / 1 Hex ]
[0 to 1 / 0 / 1 ]
0: OK, 1: SBU connection check failure
If the SBU connection check fails, SC144-001, -002 or
-003 occurs.
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SP4-xxx: Scanner-2
D009/D011/D012/D013