Printing error on desktop when printing to 4600dn

your printer driver is corrupt or the files your printing are corrupt- most 49.xxyy errors are down to software external to the printer. not sure?.
disconnect the printer from all network points and cycle the power - when it is ready perform a path print test ( found under the diagnostics menu on the printer itself ) and you will likely find no errors ( if by some horror of horrors you do get 49.xxyy error then you will need to replace the firmware chip - Very Very unlikely) -
what to do--
remove the printer and uninstall from the workstation - reboot the PC - re install the latest driver for your operating system downloaded from HP website
re connect the printer - print away !!

Open the file or image you want to print.Select File>Print>Print Wizard/Tab opens>Select the printer from drop down list>Click Properties tab on the right side area>Below Color Intensity Area>click GREYSCALE PRINTING.

This work for me so give it a try.

I need more info...what application are you printing from? What operating system?
Windows? Is the printer directly connected to your pc? Is it wireless? Networked?

Try changing the port on the router.
Also you can follow the cable from the printer to the router.
Check that the cable has not been damaged.
Replacing the cable and trying another port on your router is the cheapest option
before the HP Technicians come out.
Good Luck

You have a failed JetDirect network card (look on back where the network cable plugs in) usually a grey or white slot card with 2 thumb screws (ex: 610n). If this is add-in card, you can buy a replacement and reinstall it. If the network port is built onto the printers fomatter (main board), then you need an authorized HP repair center to replace and set the serial number through service mode.

plug network card again, after try to change theother, because ROM card error

You can download a firmware update program from hp's website that will automatically update the firmware on your printer. I would start there and make sure you are using the most current version.

Make sure the settings are properly set within the program and printer.

The problem is usually caused by printing a PDF file with fonts/page size/ page formating errors which will cause the printer to display the 49.3048 error. The only way to use the printer is to POR or recycle the power and delete the print job from the server or spooling device and cancel it on the printer before the offending command is issued to the printer again. You can try updating the firmware to the latest version 46.140.5 from the HP website. MIke L.