HP 3150 manual Solenoid, photosensors, and switches

Solenoid, photosensors, and switches

The following figure shows the locations of the solenoid, photosensors, and switches.

1 2 3 4 5

6

7

8

Figure 13. Solenoid, photosensors, and switches

1	Pickup solenoid (SL1). Enables the pickup roller.
2	Paper registration	Detects the leading and trailing edges of the paper. Synchronizes
	sensor (PS203).	the photosensitive drum and the top of the paper.
3	Door open/cartridge	Detects whether or not the printer door is closed and the toner
	sensor (SW101).	cartridge is present. Printing cannot continue until the printer
		door is closed and the toner cartridge is in its correct position.
4	Paper out sensor	If the sensor does not sense paper in the paper input bin or the
	(PS202).	single-sheet input slot, the control panel displays the paper-out
		message. Paper must be loaded before printing can resume.
5	Document sensor	Detects the presence of a document in the document input bin.
	(PS801)
6	Edge of document	Detects the leading edge of a document in the document
	sensor (PS802)	scanner path.
7	Paper exit sensor	Senses when paper has successfully moved out of the fixing
	(PS201).	area.
8	Engine test switch	See Chapter 6, “Troubleshooting,” for information about engine
	(SW201).	tests.

80 Functional overview EN