![](/images/new-backgrounds/1153049/153049135x1.webp)
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.
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| Solenoid and Sensors |
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Table |
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| Solenoid and Photosensors |
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| Name | Description |
SL1 |
| Paper | Enables the Paper Pickup Roller. | |
PS201 |
| Paper Exit Sensor | Senses when paper has successfully moved out of the | |
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| fusing area and the next sheet of paper can be fed. |
PS202 |
| Paper Out Sensor | Senses no paper in either the Paper Input Bin or Manual | |
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| Input Slot. If this sensor does not sense paper in the Input |
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| Paper Bin or the |
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| displays the |
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| must be reloaded before printing can resume. |
PS203 |
| Paper Registration Sensor | Detects the leading and trailing edges of the paper. | |
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| Synchronizes the photosensitive drum and the top of the |
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| paper. |
PS204 |
| Door Open/Cartridge Sensor (HP LaserJet 5L only) | Detects whether printer door is open and cartridge is in | |
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| In the HP LaserJet 6L, SW101 performs the | place. If the door is open or the cartridge is not in place, the | |
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| functions of 5L’s PS204. | control panel LEDs will display an error message. Printing | |
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| cannot continue until the door is closed and the cartridge is |
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| in proper position. |
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5 Functional Overview