Ricoh D146 Service Manual page 1211

Main SP Tables - 4
Shows cause of error when an error occurs during the white level adjustment
when scanner turns on.
When an error, SC142-00(F side/white level adjustment error)will be
given.[format] binary
Scan adjust error (F side/White level) flag=
(b15,b14,b13,b12,b11,b10,b9,b8,b7,b6,b5,b4,b3,b2,b1,b0)
Black level
002
Shows cause of error when an error occurs With the Black level check when
scanner turns on.
When an error, SC141-00(F side/Black level adjustment error) will be given.
[format] binary
Scan adjust error (F side/Black level) flag=(b7,b6,b5,b4,b3,b2,b1,b0)
D146/D147/D148/D149/D150
[0 to 65535 / 0 / 1/step]
Bit7: Unused
Bit6: Unused
Bit5: Black level abnormal (F
side/RED/EVEN Pixel)
Bit4: Black level abnormal (F side
/RED/ODD Pixel)
ENG Bit3: Black level abnormal (F side
/GREEN/EVEN Pixel)
Bit2: Black level abnormal (F side
/GREEN/ODD Pixel)
Bit1: Black level abnormal (F side
/BLUE/EVEN Pixel)
Bit0: Black level abnormal (F side
/BLUE/ODD Pixel)
2-492 System Maintenance Section