d-Color MF4003/MF3303
P THEORY OF OPERATION > 1. d-Color MF4003/MF3303
P-14
[1] TCR sensor
(4)Auxiliary toner replenishing control
• If the T/C ratio detected by the TCR sensor is equal to, or lower than, a predetermined value at the start of a print cycle, initiation of the
print cycle is prohibited and the imaging unit is replenished with toner from the toner cartridge until the T/C value reaches the
predetermined value.
• The auxiliary toner replenishing control for imaging unit is terminated as soon as the predetermined T/C ratio is recovered. It is also
terminated if the auxiliary toner replenishing control for imaging unit is repeated four sets.
(a)Operation flow
• When the auxiliary toner replenishing control is performed, the developing section is agitated, the T/C ratio is calculated by the TCR
sensor for each color of toner, and toner is replenished from the toner cartridge.
Agitate Imaging unit
Detect T/C (measure)
Replenishing control
Detect T/C (measure)
[*1]
End replenishing sequence
Ton er replenishing
Agitating operation*2
Ton er replenishing
Agitating operation*2
Ton er replenishing
Agitating operation*2
Agitating operation*3
• *1: If a predetermined T/C is not reached, return to replenishing control (a maximum of 5 times).
• *2: Agitate imaging unit during replenishing
• *3: Agitate imaging unit after replenishing
(5)Toner cartridge detection
• Each toner cartridge contains the toner cartridge set board to detect the toner cartridge set status.
• Accessing the toner cartridge set board with the front door closed or main power on judges that if the toner cartridge is installed or not
installed.
• After the toner cartridge has been detected, the main body then determines whether the cartridge is new or not.
NOTE
â–ª If the toner cartridge is replaced with a used one, the toner remaining amount may not be displayed correctly. Make sure to
replace the toner cartridge with a new one.
(6)Toner near-empty condition detection
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