Ricoh B121 Service Manual page 196

SERVICE PROGRAM MODE
4901 SBU White Level Adjustment
4901 1 Black Display-Error
Displays the return code of the black-level adjustment. When an error is detected,
SC143 or SC145 is generated.
4901 2 Black Feedback-EVEN
Displays the feedback value of the even channels given by the SBU. Normally, the
value is 1, 2, 3, ..., 8188, 8189, or 8190. However, machine may operate normally
even when the value is 0 or 8191.
4901 3 Black Feedback-ODD
Displays the feedback value of the odd channels given by the SBU. Normally, the
value is 1, 2, 3, ..., 8188, 8189, or 8190. However, machine may operate normally
even when the value is 0 or 8191.
4901 4 Black Display-Target
Displays the target value for the black-level adjustment executed during machine
initialization. Normally, the value is 10. Other values indicate that the adjustment
has ended unsuccessfully.
4901 5* White Target
Displays the target value for the white-level adjustment.
4901 6 White Result
Displays the result of the white-level adjustment.
4901 8 White Display-Error
Displays the return code of the white-level adjustment. When an error is detected,
SC143 is generated.
4901 9 White Display-Overflow
Displays a return code of the white-level adjustment. The code "1" (error) is
returned if the adjustment result is not in the range of the values in SP4-901-6.
B121 Series/B259 Series
[0 = Normal / 1 = Error]
[0 ∼ 8191]
[0 ∼ 8191]
[0 ∼ 63 / 10 /step]
[0 ∼ 511 / 511 / 1/step]
[0 ∼ 511 / 0 / 1/step]
[0 = Normal / 1 = Error]
[0 = Normal / 1 = Error]
5-36 SM