Ricoh B291 Service Manual page 288

SERVICE PROGRAM MODE TABLES
4659* Gain Adjustment: Prev
When the machine is turned on, the SBU performs separate fine adjustments for
Ech (the even channel) and Och (the odd channel). These SP codes read the
values of the adjustments in effect before the machine was powered on. These SP
codes should display 223±1, set by the white level peak adjustment as the fine
gain adjustment and sent to the DAC.
You can use these SP codes to adjust the value manually. Be sure to turn the
printer off and on to enable any settings that you change.
4659 1 EVEN
4659 2 ODD
4674* BK Rough Adjustment: Factory DFU
4674 1 EVEN
4674 2 ODD
4674 3 EVEN
4674 4 ODD
4678* Gain Adjustment: Factory DFU
When the machine is turned on, the SBU performs separate fine adjustments for
Ech (the even channel) and Och (the odd channel). These SP codes read the
values of the adjustments in effect before the machine was powered on. These SP
codes should display 223±1, set by the white level peak adjustment as the fine
gain adjustment and sent to the DAC.
You can use these SP codes to adjust the value manually. Be sure to turn the
printer off and on to enable any settings that you change.
46781 EVEN
46782 ODD
4691* White Peak Level
4691 1 EVEN
4691 2 ODD
4694* Black Level
4694 1 EVEN
4694 2 ODD
4800 SBU Setting DFU
This SP switches the black offset compensation mode on and off. Black offset
correction is done during automatic image density correction (ADS).
Note: This SP operates only if the black offset correction circuit is built into the
SBU.
0: Off
1: On
B291/B295/B296/B297
CÓPIA NÃO CONTROLADA
[0~255/0/1]
[0~255/200/1]
[0~255/0/1]
[0~255/0/1]
[0~255/0/1]
5-28
CÓPIA NÃO CONTROLADA
Black Level Adjustment Mode
SM