HP 1100AHP - Manual (Page 57)

C4224-90962 Printer paper feed system 55
Solenoid, photosensors, and switches
The following figure shows the locations of the solenoid, photosensors, and switches.
Table 3-2. Solenoid, photosensors, and switches
1 Pickup solenoid
(SL001) Enables the pickup roller.
2 Paper top sensor
(SL001) Detects the leading and trailing edges of the paper. Synchronizes
the photosensitive drum and the top of the paper.
3 Door open sensor
(SW301) Detects whether or not the printer door is closed and the Toner
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
(PS001) If the sensor does not sense paper in the Paper Input Bin or the
Single Sheet Input Slot, the Control Panel displays the paper-out
message. Paper must be loaded before printing can resume.
5 Document sensor
(PS1) Detects the presence and leading edge of a document in the
document feed path.
7 Paper exit sensor
(PS201) Senses when paper has successfully moved out of the fusing
area.
8 Engine test switch
(SW201) See “Troubleshooting” in this chapter for information about
engine tests.
9 Power Switch
(SW101) Turns power to printer on and off (220V units only).