Laserjet III Disassembly

If the error message, Unknown device appears, this can indicate that there is not adequate power and the PC can not identify the printer correctly. Verify that there are no extension cables and that the power cable is no longer than five meters. Reseat the power cables.

Make sure that both ends of the USB cable are correctly inserted into the computer and the printer. Try disconnecting and reconnecting the USB cable at both ends. Disconnect the printer and the computer and reconnect them. Try another USB port if available.

Open the start menu and select Control Panel > Administrative Tools > and choose the Services icon. Locate the Print Spooler service and right-click. Then select the option to “Stop” the service.

If you see an “unknown accessory detected near you” message (or similar), it means there`s an item compatible with the Find My network that might be traveling with you. If so, its owner may be able to see your location. You should look to see if something you`re borrowing has such a device attached.

Updated: 10/11/2021 by Computer Hope. An unknown device is a device name listed in Device Manager that Windows cannot identify or doesn`t have the appropriate drivers to be recognized.

Improperly Loading Paper into the Device

Loading paper that is stuck together, frayed, curled or bent can cause a jam. Overloading the paper tray, loading different thicknesses of paper in the tray or using paper that isn`t appropriate for your particular printer can all result in a jammed printer.

Turn the product on while you press and hold the Resume button for 10-20 seconds. The Attention light turns on. Release the Resume button. The Attention and Ready lights cycle while the product restores factory defaults.

Check the USB cable for damage and recommended length, and then restart your printer and computer. Turn off the printer and the computer. Disconnect the USB cable from the computer and printer, and then inspect the cable. If the cable is damaged or longer than 3 m (9 ft 10 in), replace it.

Make sure your Wi-Fi network and printer setup meet connection requirements. Restart the printer and the computer or mobile device to clear possible error conditions. Make sure the printer is not connected to a computer with a USB cable.

In the Devices and Printers window click on Add a printer. Choose “Add a local printer or network printer with manual settings”, then click Next. Select Create a new port and choose Standard TCP/IP Port, then click Next. Under Hostname or IP address: Type in the IP address of the printer you intend to connect to.

Ghost prints happen when the drum or fuser unit within your printer become faulty. Because a fault with this element won`t heat the particles of the toner to a high enough temperature, the marks being made on the paper are much lighter in colour and appear more faded than typical documents.

In Windows, go to Printer Properties > Maintenance > Clean Heads > OK and follow on-screen prompts. On a Mac, check the Applications folder for a Utility application for the printer. To manually clean the printer, remove printheads and use equal parts water and isopropyl alcohol to clean them.

All devices on a network may be found using their IP address and MAC address. A device on the internet or a local network is identified by its specific IP address, which is unique. The MAC address is the physical address that identifies each device on a network.

If you want to disable an AirTag, AirPods, or another Find My network accessory to stop sharing your location with its owner, tap Disable in the Find My app and follow the onscreen steps. Once the item is disabled, you will no longer get updates on its locations nor receive unwanted tracking alerts on the item.

This could happen if there are no updated drivers for the printer. I would suggest you to visit manufactures` website ad install the latest printer drivers compatible for Windows 7. Method 2: To find devices that are connected to your computer but aren`t listed in Devices and Printers, look in Device Manager.