HP Laserjet printer 49.3048 Service Error"

Don't print those documents again; if necessary, remove the offending document from the print queue on the computer that caused it. On Windows or Macs, stop the printer queue and remove all the jobs from it. On linux, use 'lprm''. Don't try printing the same file again if you can help it.

If you can (e.g. on Windows), try using a different printer language (say, PCL instead of postscript).

Unplugged the printer from the network or computer and turned off. If that doesn't work try a cold reset. Turn the printer on and once the memory starts to count up press and hold the check button until the three lights light up and release then scroll down and hit the check mark on cold reset and see if the printer comes to ready.