HP LaserJet 6L Service Manual - Page 68
Solenoid and Sensors, Solenoid and Photosensors
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Figure 5-6 Figure 5-6 shows the locations of the photosensors, switches, solenoid, and other important printer elements. Table 5-1 describes the function of each photosensor and the solenoid. Solenoid and Sensors Table 5-1 Solenoid and Photosensors No. SL1 PS201 PS202 PS203 PS204 Name Description Paper Pick-up Solenoid Enables the Paper Pickup Roller. Paper Exit Sensor Senses when paper has successfully moved out of the fusing area and the next sheet of paper can be fed. Paper Out Sensor Senses no paper in either the Paper Input Bin or Manual Input Slot. If this sensor does not sense paper in the Input Paper Bin or the Single-Sheet Input Slot, the formatter displays the paper-out indication on the front panel. Paper must be reloaded before printing can resume. Paper Registration Sensor Detects the leading and trailing edges of the paper. Synchronizes the photosensitive drum and the top of the paper. Door Open/Cartridge Sensor (HP LaserJet 5L only) In the HP LaserJet 6L, SW101 performs the functions of 5L's PS204. Detects whether printer door is open and cartridge is in place. If the door is open or the cartridge is not in place, the control panel LEDs will display an error message. Printing cannot continue until the door is closed and the cartridge is in proper position. Functional Overview 5 - 17 Functional 5 Overview