Solenoid, photosensors, and switches The following figure shows the locations of the solenoid, photosensors, and switches. Figure 15. Solenoid, photosensors, and switches 1 Door-open switch (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. 2 Engine-test switch (SW201); see “Engine test” on page 167 for an explanation of the switch. 3 Paper-top sensor (SL001) detects the leading and trailing edges of the paper. Synchronizes the photosensitive drum and the top of the paper. 4 Pickup solenoid (SL001) enables the pickup roller.
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