Black Toner Replenishing Control - Minolta CF910 Service Manual

1154SBM1106A

11-6. Black Toner Replenishing Control

• The amount of toner consumed and toner-to-carrier ratio are calculated for each copy to
determine the amount of toner to be replenished and to replenish toner.
Calculating the amount of toner consumed and toner-to-carrier ratio
• Using the table for conversion between the density level at each gradation level and the
amount of toner affixed to the paper (the amount of toner affixed to paper for the density
level of one dot of each gradation level), the amount of toner consumed is calculated
with LIMOS1 and New Screen LIMOS to find toner consumption of the entire original.
• The values on the conversion table for LIMOS1 are double those on the conversion
table for New Screen LIMOS (as LIMOS1 is used for reproduction of edges).
• With the image transfer efficiency set at 90%, the total toner consumption on the PC
Drum is calculated.
• When the FD size exceeds 216 mm, one-line reading is skipped for every 2 lines in the
CD direction. Thus, the calculated consumption is doubled.
• In two-sheet attraction, data is taken only for the first sheet and the toner consumption
calculated from that reading is doubled.
• Considering toner consumption that represents airborne toner particles, toner consump-
tion on the PC Drum is multiplied by 1.3.
• Considering the developing efficiency, copier's internal environment, and durability
value, the toner-to-carrier ratio is estimated through AIDC control.
Using the above data and program, the copier calculates and estimates the amount of
toner consumed and toner-to-carrier ratio.
Determining the amount of toner to be replenished
• The amount of Bk toner to be replenished is determined based on the calculated toner
consumption and toner-to-carrier ratio estimated through AIDC control.
Estimated
Toner-to-
Adequate
Carrier
Ratio
Low More than the calculated amount of toner consumed
Amount as calculated
High Less than the calculated amount of toner consumed
M-59
Amount of Toner Replenished