HP LaserJet M1120 Service Manual - Page 51

Table 4-1 Sequence of operation (continued) Name Timing Purpose PRINT LSTR (last rotation) 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 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 35