Ricoh D072 Service Manual page 258

No.
Definition
Scanner home position error 2
The scanner home position sensor
121 B
does not detect the scanner coming
back to the home position.
SBU black level correction error
The automatic SBU adjustment
has failed to correct the black
level three times at the
pre-offset adjustment.
The automatic SBU adjustment
141 B
has failed to correct the black
level ten times at the PGA
adjustment.
The automatic SBU adjustment
has failed to correct the black
level ten times at the offset
adjustment.
SBU white/black level correction error
The automatic SBU adjustment has
142 B
failed to correct the white level ten
times at the PGA adjustment.
SM Appendix
Symptom
3-3
SC Tables (F/SPF: D068/D069)
Possible Cause
Defective scanner home
position sensor
Defective scanner drive motor
Defective scanner home
position sensor connector
Defective scanner drive motor
connector
Defective BICU board
Defective SBU board
Defective exposure lamp
Unclean white plate
Incorrect position or width of
white plate scanning (
SP4-015)
Defective SBU board
D067/D068/D069/D072