The toner bottle stops if the sensor does not detect "toner remaining" after operating for 30
seconds.
Toner end
Pattern (1): Determination by paper sheet counter/pixel counter
The total sheet counter and pixel counter values after definite toner near end are compared with
the threshold values.
If the following "(evaluation method A=TRUE) and (evaluation method B=TRUE) or (evaluation
method C=TRUE)" is satisfied, it is determined as toner end.
Determination method A: Sheet counter (SP3-133-011 to 014) > Sheet counter threshold value
(min)
Determination method B: Sheet counter (SP3-133-011 to 014) > Sheet counter threshold value
(max)
Determination method C: Pixel counter (SP3-133-031 to 034) > Pixel counter threshold value
Pattern (2): Determination by Vt output
When the deviation between the TD sensor output value and TD sensor target value has become
large, it is taken as toner end.
After definite toner end has been determined
The difference between the output of the TD sensor (Vt: SP3-210-001 to 004) and the target value
of the TD sensor (Vtref: SP3-230-001 to 004) is computed as the delta Vt, and values of the delta
Vt larger than the threshold value (SP3-131-001) are integrated as "sigma delta Vt"
(SP3-132-001 to 004).
If the integration value of "sigma delta Vt" is larger than the threshold value (SP3-132-002), it is
determined to be toner end.
Before definite toner near end is determined (bottle full or estimated toner near end)
The computation is done in the same way as for definite toner near end, but separate values for the
delta Vt threshold value and "sigma delta Vt" threshold value are used.
the delta Vt threshold value before NE: SP3-131-011
"sigma delta Vt" threshold value before NE: SP3-131-012
SP Descriptions
• SP3-101-001 to 004 (Toner Status :Disp)
Displays the amount of toner remaining for each color. Uses a descending 10-step scale: 10: Full,
2: Estimated toner near end, 1: Definite toner end, 0: Toner end
• SP3-110-001 to 004 (Near End Thresh)
Sets the threshold amount of judging near-toner end.
• SP3-102-001 to 004 (Toner Remain:Disp: Bottle Motor Bk, C, M, Y)
Toner Supply
1249
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