An Unknown device message appeared Cause | HP A520 instruction

Chapter 7

4.Disconnect all USB devices (including the hub) from the computer.

5.Turn on the computer.

6.Try printing again. If the problem persists, repeat steps 1–5 using a different USB port on the computer.

A small red circle appeared on the HP Digital Imaging Monitor icon in the Windows taskbar

Cause: There is a connection or communication problem between the printer and the computer.

Solution:

1.Connect the printer directly to a USB port on the computer.

2.Unplug the USB cable from the computer, then plug it in again.

3.Disconnect all USB devices (including the hub) from the computer.

4.If you are using a USB hub to connect the printer and computer, unplug the printer from the USB hub and connect it directly to the computer to verify communication.

5.Try printing the document again. If the problem persists, repeat steps 1–5 using a different USB port on the computer.

An Unknown device message appeared

Cause:

•Static electricity may have built up in the cable between the computer and printer.

•The software could not identify the printer because the printer-USB connection may be defective.

Solution:

1.Disconnect the USB cable from the printer.

2.Disconnect the power cord from the printer.

3.Wait about 10 seconds.

4.Plug the power cord back into the printer.

5.Plug the USB cable back into the USB port on the back of the printer.

6.If the problem persists, unplug the power cord and the USB cable and uninstall the printer software:

a. From the Windows Start menu, go to Programs > HP > HP Photosmart A520 series > Uninstall Devices.

b. Follow the onscreen instructions.

7.Restart the computer.

8.Reinstall the printer software and follow the onscreen instructions. Do not connect the USB cable to the printer until prompted.

If “Unknown device” continues to appear, check www.hp.com/support for more information, or contact HP support.

50 Troubleshooting

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HP A520 manual An Unknown device message appeared Cause

Contents

HP Photosmart A520 Series Help Contents Maintenance TroubleshootingHP support and warranty Regulatory and environmental information SpecificationsPage HP Photosmart A520 series Help Chapter HP Photosmart A520 series Help How do I? Get started Find more information HP Photosmart at a glance Control panel buttons and indicator lights Printer menus Indicator lights To use the Printer menu How to use the Printer menu Printer menu structure Printer menu options Help Chapter Get started Paper loading tips Paper basicsChoose the best paper for the job Load your paper To load paper Print without a computer Print from a memory card without a computerSupported memory cards Remove a memory card Print photos from a memory card Print from a Bluetooth device To print using a PictBridge-certified cameraPrint from a PictBridge-certified camera or device To configure Widcomm Bluetooth software on the computer Configure BluetoothTo configure Bluetooth settings on the printer Click the Configure Bluetooth Settings tab Print photos from a Bluetooth device To print from a Bluetooth deviceEnhance your photos Photo Fix remains off until you turn it on again To open the Printer Properties dialog box Print from a computerPrinter software Printer Properties dialog box Transfer photos from a camera or other device Download printer software updatesTransfer photos to a computer Whats This? help Transfer non-photo files from a memory card to the computer Transfer photos and files from a memory cardTo transfer photos to a computer Save photos from a memory card to the computer HP Real Life technology options To delete photos or files from a memory cardSelect HP Photosmart A520 series Open E Maximum dpi Change the print settings for the print jobTo change the HP Real Life technologies setting To print in Maximum dpi mode To select a print quality and speed Print quality settingsChange the print quality Change the paper type Use advanced color settings Change the paper sizeResize a photo To delete a printing shortcut Create printing shortcutsTo create a printing shortcut Click the Printing Shortcuts tab Print preview Print photosPrint borderless photos Print Orientation Portrait or LandscapeRelated topics Print photos with a border Select the Print in grayscale option Print postcardsPrint black and white photos To print in grayscale Print panoramic photos Select any other print settings you want, then click OK HP Photosmart software Print on index cards and other small mediaOrganize, edit, and share digital images in creative ways Use the Toolbox MaintenanceToolbox dialog box Open the Toolbox Align the print cartridge Clean the print cartridge automatically View estimated ink levels Insert or replace the print cartridgeClick the Estimated Ink Levels tab To insert or replace a print cartridge Remove ink from your skin and clothing Get print cartridge ordering information Print a testPrint a sample Click Print a Sample HP Digital Imaging Monitor iconStore the printer and print cartridge Storing the printer Store the print cartridges Chapter Maintenance Solution TroubleshootingSoftware installation issues Printer software did not install successfully Printing and hardware issues To install the HP Photosmart SoftwareMissing HP Photosmart Software Printout did not appear Printer is plugged in, but it will not turn on Solution Computer and printer lost communication Cause Solution Restart the computer An Unknown device message appeared Cause Printer did not print borderless photos Could not save photos from the computer to the memory cardPrinting is very slow Cause Click More color options Printer ejected the paper when preparing to printPress Ctrl+Alt+Delete Printout is rippled or curled Print quality is poor Cause Bluetooth printing problems My Bluetooth device cannot find the printer SolutionPrintout does not appear as it should Photo printed with borders Device messagesNo page came out of the printer Print quality is poor Low on ink Print cartridge is old or damagedPrint cartridge is missing or incorrect Memory card has been inserted upside down Print carriage has stalled Printer is out of paperThere is a paper jam Paper loaded does not match the paper size selected There was a problem with the memory card Insert only one memory card at a timeCommunication with the printer has been lost To order print cartridges from your desktop Shop for ink supplies Chapter Shop for ink supplies Phone support period HP support and warrantyCheck the HP support Web site first HP support by phone After the phone support period Placing a call HP Warranty Additional warranty options Chapter HP support and warranty Specifications Printer specificationsSystem requirements International Regulatory notices Regulatory and environmental information Chapter Environmental product stewardship program Recycling program Material safety data sheetsPaper use Plastics Environmental product stewardship program