G147 6-32 SM
6.7.6 TONER NEAR END/END DETECTION
Standard Method for Toner Near-End/End Condition Detection
The toner near-end condition is detected based on the Vt(10) output from the TD sensor.
 If the difference between Vref (toner supply reference voltage) and Vt (10) is less than
or equal to –0.45, then toner concentration is judged as very low and K (the toner supply
coefficient) is set to 0.25, the machine enters the toner near end condition and the
machine switches on the toner supply motor.
 If a difference greater than –0.45 is detected, then toner concentration is judged as low
but the machine does another test by comparing Vref and Vt (10).
 If the machine determines that Vt (10) is greater than Vref 40 times, the toner supply
motor switches on and remains on for twice the time that Vt (10) was greater than Vref.
If the toner concentration is still low, then the machine enters the toner near end
condition.
The final toner end is detected using the ID sensor. If the ID sensor detects that the ID
sensor pattern is very light (Vsp drops below 2.0 V), then the sensor triggers the toner end
condition.
If Vsp is less than 2.0 V, the density of the ID sensor pattern is very light, so the machine
detects the toner end condition. However, if Vsp remains higher than 2.0 V but 90 copies
have been made after toner near end was determined, the machine enters the toner end
condition.
 The number of copies between toner near-end and toner end can be changed with
SP2213. The default is 90 copies.
Adjustable Near-end Warning Method
By storing a value in SP2975, a near-end warning can be set up to appear on the LCD when
the toner supply motor has rotated for a certain amount of time from after a new toner bottle
was installed. This allows the user to be prepared much earlier than just 90 prints to change
the bottle. Refer to the SP table for more.
6.7.7 TONER END RECOVERY
If the front door is opened and then closed while a toner near end/end condition exists, the
machine will attempt to recover. When the front door is closed, the toner supply motor turns
on to supply toner. The machine checks the TD sensor output 2 seconds after the main
motor turns on (Vtp), and the sensor is checked again every 1 second (Vtp1)
The machine detects the toner concentration using Vref, Vt (10), Vtp, and Vtp1. If the toner
concentration is still too low, the toner supply motor remains on for another 10 seconds while
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