HP LaserJet M9040/M9050 Service Manual - Page 121

Table 5-2 Failure sequence State Period Operation JAM After product is turned on until the end of the ● LSTR state ● Check sensors. Stop drives. ● Set status. DOOR OPEN ● After product is turned on until the end of the ● LSTR period ● Check door open. Stop drives. Set status. ● Await door close sequence. FAILURE After product is turned on until the end of the ● LSTR period ● Stop drives. Set status. SLEEP After product is turned on until the end of the ● LSTR period Stop drives (scanner motor, high-voltage control, fuser control, fuser/delivery motor, 24 V, 3.3 V sets PowerSave mode, fan motor). ● Set status. ● Check door open. Product start up sequence (turn on product) 1. Product is turned on. 2. Initialize CPU and ASIC. 3. Begin video interface communication with the formatter. 4. Start all fans. 5. Flush residual paper from the paper path. 6. Check for cartridge presence. 7. Check cartridge memory. 8. Initialize installed accessories. 9. Start fuser and pressure roller heaters. 10. Turn on pickup-roller motor and cassette-lifter motors. 11. Turn off pickup-roller motor and cassette-lifter motors. 12. Turn on fuser motor, drum motor, and transfer negative bias. 13. Turn on pressure bias and jam detection lever drive solenoid (SL501). 14. Turn on developing AC bias for toner-level detection. ENWW Basic operation 103