HP LaserJet M2727 Service Manual - Page 89

Table 4-1 Sequence of operation (continued) Name Timing Purpose PRINT From the end of the INTR period until the primary high-voltage is turned off Forms the image on the photosensitive drum and transfers the toner image to the media LSTR (last rotation) From the end of the PRINT period (when high-voltage is turned off) until the main motor stops rotating Delivers the last page of a print job After LSTR, the product either returns to STBY or, if another print command was sent from the formatter, enters INTR. Table 4-2 Power-on sequence Step Action 1 Power-on 2 CPU initialization 3 Start video interface communication 4 Check sensors for residual media 5 Main motor initial drive 6 Fuser heater initial drive. The fuser heater reaches a surface temperature of 100o C. 7 Laser/scanner motor initial drive 8 High-voltage control Detect presence of a print cartridge Clean the transfer roller after the primary charging AC bias is turned on 9 Failure/abnormality check: detect laser/scanner failure, fuser failure, and open covers 10 Communication with the memory tag ENWW Basic operation 71