HP LaserJet M9040/M9050 Service Manual - Page 120
Theory of operation, Normal sequence continued
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Table 5-1 Normal sequence (continued) State Period Operation ● Run fan motors 1-5 at half speed with fan 6 off. ● After five minutes or more, run the fuser/delivery motor for about 0.08 seconds to prevent deformation of the pressure roller. Initial rotation (INTR) After a print-reservation command until the ● Run scanner motor. laser/scanner enters a ready state ● Run fuser/delivery motor. ● Run drum motor. ● Run high-voltage control (negative bias to transfer roller). ● Receive print command. ● Run fan motors 1-6 at full speed. ● Start pickup operation. ● Apply high-voltage control bias to primary charging roller, developing roller, and transfer roller. ● Heat fuser roller to 190°C (374 °F) and pressure roller to 180°C (356°F). ● Execute final check on initial rotation (high-voltage, scanner motor, pickup operation complete). ● Check jam/door open/failure/sleep. PRINT After the input of a print command until the ● Run fuser/delivery, drum, scanner, and fan motors. primary DC bias is turned off ● Set fuser control to print temperature: fuser 190°C (374°F). ● Send engine-to-formatter output signal. ● Send formatter-to-engine input signal. ● Run paper-feed control. ● Run image control. ● Set high-voltage control (toner level-output separation bias and pressure roller bias). ● Run next-pickup control to calculate the speed at which to move media. Last rotation (LSTR) ● After the primary charging roller is turned off ● until each motor stops Check jam/door open/failure. Run fuser/delivery, drum, scanner, and fan motors. Complete high-voltage control. ● Set fuser control to standby temperature (180°C (356°F)). Run fans 1-6 at full speed. ● Stop fuser/delivery, drum, and scanner motors (write in cartridge memory). ● Check jam/door open/failure. Await next pickup. 102 Chapter 5 Theory of operation ENWW
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