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Toner Supply Control
The Toner Supply Type can be selected with SP3-400-001 to 004 (Toner Supply Type).
0: Fixed (Fixed supply method)
The toner supply time is calculated based on the supply rate of SP3-440-001 to 004 (Fixed Supply Mode: Fixed Rate).
2: PID (Proportion Integral Differential)
The amount of toner supply is calculated based on the pixel information and TD sensor information.
4: DANC (Divided Active Noise Control) (Default)
Conventional PID method + active noise control. It controls the timing to supply the developer to minimize uneven developer density in the development unit.
Developer Initial Setting
When a new PCDU is set in the machine, the machine automatically detects it and enters the developer initial setting mode. The machine then detects the 
count which is an output from the TD sensor. The developer initial setting is done as follows.
1. Starting the developer initial setting mode
The new unit detection mechanism triggers the developer initial setting mode.
2. Agitating the developer
The machine rotates the development roller and transport coil to agitate the developer for 30 seconds.
3. Detecting the 
count (Initial value)
While agitating the developer, the machine detects the output from the TD sensor, and stores this output as the initial 
count.
4. Calculating Vt
The machine calculates Vt using the difference of the current 
count while referring to the initial 
count through SP.
5. Forced toner supply (only when newly installing the machine)
This step is required only when the machine is newly installed because there is no toner in the toner transport route.