20 June 2005
DEVELOPMENT
6-67
Detailed
Descriptions
Image Pixel Count Mode
This mode should only be used only as a temporary measure while waiting for
replacement parts, such as a TD sensor. This mode controls the toner supply
amount using the same method for determining the toner bottle motor on time.
However, the values that were in effect when the toner density control mode was
changed over to image pixel count mode with SP2-208-1 (Toner Supply Mode)
remain in effect and cannot be changed.
6.9.6 TONER NEAR END/END DETECTION
Toner Near End
The machine triggers the toner near-end alert and starts to rotate the toner supply
bottle when either of the following two conditions occur.
•
The machine detects (1) the toner supply rate (amount of toner supplied per
second set with SP2209 1) drops to 25, (2) the current output of the TD sensor
(Vt) has dropped below the target value after 40 samples, and then (3) still fails
to detect the target Vt after an additional 40 samples.
•
The machine determines that the toner density is too light after it detects that (1)
the difference between Vref (the TD sensor reference voltage) and the averaged
density of the previous 10 copies is more than 0.2V, and (2) Vsp (the reflectivity
of the ID sensor pattern) is greater than 0.7V.
Toner End
After the machine enters the toner near-mode, it will trigger the toner end alert if
any of the conditions below continue to exist:
•
TD sensor output does not reach the target value within 90 copies after the toner
near-end alert ("90" is the default setting for SP2213).
•
The ID sensor output from reading the ID sensor pattern (Vsp) is extremely low
(light).
•
The averaged TD sensor output Vt exceeds exceeds 0.15V.
