HP LaserJet 2400 Service Manual - Page 245
General timing diagrams
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General timing diagrams 231 ENWW Timing diagram, HP LaserJet 2400 series Figure 7-15. SEQUENCE Power Switch ON WAIT 1 Print Command 2 Main Motor (M1) 3 Fuser Heater (H1) 4 Fuser Motor (M2) 5 Scanner Motor(M3) 6 Cassette Pickup Solenoid (SL1) 7 Tray 1 Pickup Solenoid (SL2) 8 Paper Feeder Pickup Solenoid (SL3) 9 Top of Page Sensor (PS801) 10 Delivery Sensor (PS803) 11 Primary Charging Bias (AC) 12 Primary Charging Bias (DC) 13 Developing Bias (AC) 14 Developing Bias (DC) 15 Transfer Charging Bias 16 Laser Diode 17 LASER BEAM signal (BD) 18 19 20 0.2 120°C Control 0.5 About 7.4 About 3.3 About 0.22 About 0.22 About 6.2 Negative Bias STBY INTR PRINT LSTR 0.2 120°C Control 0.5 0.7 3.7 3.9 3.2 3.0 About 0.7 About 0.4 About 1.2 About 1.39 About 1.05 About 1.46 0.8 1.43 0.27 0.09 0.23 0.09 0.23 1.5 About 0.44 About 1.5 0.78 Forced emission 0.16 0.23 0.16 0.34 0.47 0.23 (Unit:Seconds) STBY General timing diagrams