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Chapter 2
Memory tag
The cartridge consists of the following: photosensitive drum, primary charging roller, developing cylinder, toner feed roller, stirring plate, memory tag.
The developing cylinder, toner feed roller, stirring plate, and photosensitive drum are rotated by the main motor, and the primary charging roller operates in con-
junction with the photosensitive drum.
The drive to the developing cylinder, toner feed roller, and stirring plate is transmitted by way of the developing cylinder drive solenoid. The solenoid may be the
Bk developing cylinder drive solenoid (SL3) or the MCY developing cylinder drive solenoid (SL2). When a Bk print is made, SL2 is left off so that the drive of
the main motor will not reach the developing cylinder. When the ETB is being cleaned, both SL2 and SL3 are off, not permitting the drive of the main motor to
reach any of the developing cylinders.
2.4.4.2 Memory Tag Control
LBP5000 / LBP5100
The machine checks the usage of the cartridge with reference to the data retained in its memory tag. If it finds that a read/write operation has failed, it will indicate
a message in the status window to prompt the user to check the connection of the toner cartridge.
2.4.4.3 Detection of Toner cartridge presence/absence
LBP5000 / LBP5100
This machine detects if a toner cartridge is mounted on the printer.
The DC controller PCB recognizes that the toner cartridge is absent if the color displacement/density sensor cannot find any of the detection patterns written in the
ETB.
Then, the PCB shows the message "Toner cartridge is absent." on the status window.
If detecting an improper insertion of the cartridge, the PCB shows the message "Toner cartridge is not mounted on the correct position." on the status window.
2.4.4.4 Detecting the End of Life of the Cartridge
LBP5000 / LBP5100
The machine monitors the cartridges to see if any of them has reached the end of its life.
The DC controller checks the following 3 types of life data, and sends the result to the video controller PCB:
1) photosensitive drum life (in terms of cumulative use of the drum)
2) developing assembly life (in terms of cumulative use of the cylinder)
3) toner level (with reference to the time it takes for light to move through the cartridge while printing is under way)
If any of the 3 values is exceeded, the DC controller PCB will identify the condition as indicating the end of life of the cartridge in question, and will indicate a
message to that effect in the status window.
The life of a cartridge is expressed in 2 sates, i.e., in terms of "alert" and "warning" in the status window.
Type
Black
Color
When the life of developing assembly or photosensitive drum is detected, a message "Check the toner cartridge" is shown on the status window. In this case, press-
ing the error reset button enables to continue printing.
If the toner absence is detected, a message "Toner cartridge needs replacing" appears on the status window.
2-18
Memory controller PCB
Primary charging roller
Stirrer plate
Warning
about 2500 impressions
about 2000 impressions
DC controller PCB
Photosensitive drum
Developing cylinder drive solenoid
Toner feed roller
F-2-22
T-2-3
Alert
2250 impressions
1750 impressions
Main motor
M
Developing
cylinder
SL
Remacks
A4 paper, 5% print ratio per side
A4 paper, 5% print ratio per side
0010-7904
0010-7905
0010-7906
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