Chapter 77-14*1: The down-time interval includes the time during which the drum unit rotates idly (10 sec).*2: This item is executed when the ongoing sleep state lasts more than 8 hr (otherwise, nothing will take place).*3: At times, ATR control and color displacement may be executed by interrupting the ongoing print job.MEMO:- When the user mode "auto gradation adjustment $ full adjustment" is selected, PASCAL control, D-half control and ARCDAT control are implemented in thisorder to adjust the image gradation density (full adjustment).- When the user mode "auto gradation adjustment $ quick adjustment" is selected, D-half control and ARCDAT control are implemented in this order to adjustimage gradation density (quick adjustment).7.3.3 Drum Film Thickness Detection 0013-8484Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iRC2550To form an optimum image against the possible wear on the photosensitive drum, the machine checks the thickness of the drum film. The check is made for everydrum (color), and the result is recorded in EEPROM of the DC controller.The DC controller is referred when this data detects the primary charging AC bias, the primary transfer bias, and the ATR control target value.1. Start-Up Timingat power-on, when closing/opening the front cover, at time of printing2. Particulars of ControlThe DC controller goes through the following to detect the thickness of the drum film:1) computes the drum count based on "length of time during which the photosensitive drum has rotated" and "length of time during which the primary charging ACbias is applied."2) adds the count obtained in 1 above to the count stored in EEPROM.3) identifies the count as indicating any of the following 3 in terms of the drum film thickness detection data based on the latest count obtained in 2 above: initialcondition, normal condition, final condition.4) in the event of there being a difference as the result of comparison of the latest drum film thickness data against the stored drum film thickness data, the newdata is written over the existing data; in the absence of a difference, on the other hand, no write operation will take place and the new data will be discarded.Return from sleep state*222 sec(approx.) Yes Yes Yes YesInitial rotation 10 sec(approx.) Yes Yes YesPrinting *3 15 sec(approx.) Yes Yes YesPost-rotation 55 sec(approx.) Yes Yes Yes Yes Yes YesWhen user-specificcalibration is performed(full correction)100 sec(approx.)Yes Yes Yes Yes YesWhen user-specificcalibration is performed(quick correction)55 sec(approx.)Yes Yes Yes YesConditionItemsDown-time(Max)Drum filmthicknessdetectionATR control Color D-maxcontrolBlack D-maxcontrolPASCALcontrolD-halfcontrolAbridged D-half controlColordisplacement controlATVCcontrol
