Operation; Toner Replenishing Mechanism/Control - Develop QC 2235 Plus Service Manual

Toner Supply section
9.3

Operation

9.3.1

Toner Replenishing mechanism/control

A. Toner replenishing mechanism
• Toner is supplied from the Toner Cartridge of each color to the Imaging Unit of each color
according to the T/C detected by the corresponding ATDC Sensor.
• A single Toner Supply Motor is turned either forward or backward to supply toner of two
different colors (Toner Supply Motor for Bk and C, and Toner Supply Motor for Y and M).
Toner Supply
Bk Toner
Motor C/Bk (M3)
Turned forward Energized
Turned backward Deenergized
When Bk Toner is Supplied
One-way clutch turns.
• Replenishing operation
1. Drive of the Toner Supply Motor is transmitted through a gear train to the drive gears of
the Toner Cartridges of two colors. A one-way clutch is used for each of these drive
gears, meaning that the drive gear turns in one direction only. Either one of these two
drive gears is turned according to whether the Toner Supply Motor turns forward or
backward.
2. As the drive gear turns, the Metering Roller turns to replenish the supply of a predeter-
mined amount of toner for the Imaging Unit. Rotation of the drive gear also turns the
Agitating Blade of the Toner Cartridge to agitate toner in the Toner Cartridge.
B. Toner replenishing control
• T/C is detected when the Developing Clutch/Bk (CL2) is energized for Bk or when the
Color Developing Motor (M6) is energized for C, M, and Y (during a copy cycle).
• The actual reading of T/C taken is compared with the T/C setting made in "ATDC Level"
of "Image Adjust" available from the Tech. Rep. mode. Based on this comparison, the
toner replenishing time is determined.
• Since toner replenishing is possible only while the developer is being agitated, the maxi-
mum toner replenishing time is fixed. If it is not possible to replenish the supply of the
required amount of toner within this maximum replenishing time, the remainder time is
stored in memory and added to the replenishing time for the next replenishing sequence.
QC 2235plus Theory of Operation Ver.1.0 Feb. 2004
Toner Supply
C Toner
Motor Y/M (M4)
Deenergized Turned forward
Energized Turned backward Deenergized
When C Toner is Supplied
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Y Toner M Toner
Energized Deenergized
Energized
One-way clutch turns.
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