HP Color LaserJet CM4730 Service Manual - Page 199

Table 4-4 Calibration timing and duration (continued) Calibration occurrence Duration When you install one or more print cartridges that have not previously been installed in the MFP. 150 seconds (2 minutes, 30 seconds) When 50 pages have been printed since installing a print cartridge. The MFP will finish printing the current job before calibrating. 75 seconds When 1,000 pages have printed since the last calibration. The MFP will finish printing the current job before calibrating. 75 seconds When eight hours have passed since the last calibration, but not while the MFP is in Sleep mode. Typically, this calibration occurs during the first job or any control panel interaction after an overnight idle period. 75 seconds When you request calibration from the control panel (Quick Calibration and Full Calibration). 280 seconds (4 minutes, 40 seconds) Type of calibration DMAX, DHALF, color-plane registration (CPR) DMAX, DHALF DMAX, DHALF DMAX, DHALF DMAX, DHALF, CPR, drum phase Table 4-5 Cleaning timing and duration Cleaning occurrence Duration When the MFP continuously prints (with no idle period or spin down) for 51 pages. either 5 seconds or 21 seconds (5 seconds is the most common) At intervals of 90 and 140 pages. The MFP will finish printing the current job before cleaning. 16 seconds Type of cleaning primary and toner charging rollers ETB ETB cleaning During this step, all toner particles that remain on the ETB are returned to the photosensitive drums in each print cartridge. Figure 4-30 ETB cleaning on page 180 illustrates this step. This control is performed by the DC controller under the following conditions: ● The power is turned on ● During operation of the color misregistration corrective control ● During operation of the image stabilization control ● The door is closed ● After completion in every prescribed number of printings ● During pickup operation specified by universal size ENWW Image formation system 179