here are some solutions for your carriage jam error.
1. Clear any jam...remove loose paper.
2.Clear the jam from the back of the printer
turn off the printer...remove the rear access door..
pull the paper out of the roller and return the rear access door.
3. Clear the paper jam from the front of the printer..while printer is on..open the carriage access door..
disconnect the power cable from the back.. remove the paper output tray.
look inside the product..check for torn papers..gently pull out the paper fromthe roller...return the paper output tray and the carriage access door. plugthe power corn and turn on..
4. Make sure the carriages move freely...while the printer is on.. open the carriageaccess door.
disconnect the power cord from the back..remove the paper output tray...lookinside if the carriage is stuck and if there is no papers or object that restrictthe carriage to move..return the output tray.. return the carriage accessdoor...
And lastly after doing this steps try to reset the printer and try to print..
To reset the printer....press the power button to turn on theprinter..disconnect the power cord from the product..disconnect the power cordfrom the wall outlet.. wait for 15 seconds.. plug the power cord to the wallsocket....plug the power cord at the back of the printer.. press the power onof the printer.. try to print the test page...
http://www.fixya.com/support/t6088190-hp_7400_displayshttp://www.fixya.com/support/t6088190-hp_7400_displays
Good luck! hope this solve the problem
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