Process Control and MUSIC
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LD Power Control
LD Control is set with SP3-600-001 (Process Control/ Select ProCon: LD Control).
• If SP 3-600-001 is set to LD Power Control by Process Control (Default): The LD strength is adjusted
based on a table which is determined by Development Bias Control and Vtref Correction.
• If SP 3-600-001 is set to use a fixed LD power, the LD power that is used depends on the settings of
SP2-221-001/002/003/004.
Toner Supply Control
SP3-400-001, -002, -003, -004
0: Fixed supply method
2: PID method
4: DANC method (Default)
• Fixed Supply method
Toner supply time is calculated based on the supply rate of SP3-440-001 through -004 (DrvTime: Setting).
• PID method
PID (Proportion Integral Differential)
The amount of toner supply is calculated based on the pixel information and TD sensor information.
• DANC method
DANC (Divided Active Noise Control): Conventional PID method + active noise control. It controls the
timing to supply the developer to minimize uneven developer density in the development unit.
Toner Near End, Toner End
Toner Near-End
First, the amount of remaining toner is detected with the pixel count and the driving time of the toner supply
motor. Then, when the amount of remaining toner is less than the threshold for toner near-end (K = 23 g, CMY
= 10 g), the machine determines a toner near-end.
For CMY, when the amount of remaining toner is less than 50 g, or when the toner end sensor, which is a
piezoelectric sensor, detects toner near-end twice, the machine also determines a toner near-end.
Toner End
A toner end is detected when the toner end sensor detects the end threshold six times in the toner near-end
condition.
The machine also detects a toner end when the difference of the Vt and Vtref, and their total difference are as in
the following matrix:
Condition Vt/Vtref: Diff Vt/Vtref: Diff: Total
K Before Near-End 0.7 V or more Over 10 V
After Near-End 0.3 V or more Over 3 V
CMY - 0.5 V or more Over 10 V
When you open and close the front door, and turn the main power off and on, the machine detects that a new
toner bottle is set. The machine then starts the toner supply to recover from the toner end. After supplying toner,
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