Process Control
G133 6-14 SM
6.2.6 TONER NEAR END/TONER END DETECTION
Toner Near End
The controller considers the following information to determine the toner near end status:
Operation time counter of the toner attraction pump [A]
Pixel counter
These values are both stored in the memory chip [B] on the toner cartridge, and copied
from the memory chip to the NVRAM on the EGB.
If either value indicates that the amount of remaining toner is 50g or less, the machine
enters the near-end condition.
Toner End
To determine the toner end status, the machine uses the TD sensor [C] in the development
unit. The machine must first be in a toner near-end condition, or toner end cannot be
detected.
Toner end is detected if both the following conditions occur:
V
T
– V
TREF
greater than or equal to "0.5" (SP3-101-021)
SUM (V
T
– V
TREF
) greater than or equal to "10" (SP3-101-026)
The machine cannot print until the toner cartridge is replaced after it detects toner end for
black. The machine can print in black and white only if cyan, magenta, or yellow are in a
toner end condition during standby mode. At this time the machine cannot do color print
jobs.
If the yellow, cyan, or magenta toner ends during a color-printing job, the job is
suspended until toner is supplied. If new color toner is not installed, the user can
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