20 Most Recent HP LaserJet 9050 Printer Questions & Answers

There are several reasons for this and it would require some troubleshooting. Here is some info on some of the troubleshooting procedure you can do. Or you could call a professional. http://printertechsforum.com/forum/showthread.php?2306-HP-9050-Laser-Jet

Follow these steps. 1. disconnect all parallel, network and usb cables and power cycle printer. If it comes to ready good. 2. After making sure that all print jobs are cleared from printer queues, reconnect the network cable or parallel cable. If printer stays are ready, good. If it errors again, likely a stale print job that you missed in a queue. Check and start over. 3. When you can get the printer to ready with the network cable attached. Go to HP.com and download and install the latest firmware on the printer. If the printer continues to 49 you can try updating the print driver as well. If the 49 error is persistent, remove the formatter and try to perform an engine test. if the engine test works then you have either a bad formatter or bad memory on the formatter. Remove memory and restart, still error, then formatter it is.If the engine test does not work then you may have a bad dc controller.

I hate to jump in the middle here, but have you swapped tray 2 and 3 to make sure that it is a problem with the printer and not the tray? My experience is very few if any lifter failures on this series but the paper trays can have issues.

Replace the fuser

IT IS A CPU PROBLEM
1 Turn off the printer, and then
turn the printer on again to
continue.
2 Check the printer
configuration.
3 Replace the print cartridge.
4 Replace the toner sensor
contact assembly.
5 Replace the DC controller.

It can be caused by a bad toner cartridge. In the cartridge the are more components able to create horizontal lines. Try with another cartridge. It can be also a simptom of a broken tooth gear somewhere in the drive section or transfer belt unit. You must do some more investigation.

Your printer might have dust on the hexagonal mirror and other optical components inside the LSU (Laser System Unit). If the printer it's dirty inside, all that dust flows and lay down on components. In course of time, it reaches the optical components and generates a "gradient wiped out" image from left to right as you are looking at the printed page. This problem is common on laser printers. On colour printers, you may find that only one or more colors have this gradient wiped out. Because they have separate Laser System Units.

Lines on drum are a sign of wear. Also may apear scratches from hard particles that came in contact with the drum surface. In some cases, the lines apear if the cleaning blade inside drum unit are wear. Or the mechanism that pulls out the waste toner is broken and the waste toner accumulates in the drum unit and have no other way to came out only at the drum seals. Try to print a Supply Status Page and take a look how many pages you have printed with that supply. If you are near the estimated life cycle, go on and change it. There are cases when the transfer belt is wear-out or damaged and you will get some similar lines on the printed page.

Have you tried to lift the green handle from right of the metal plate that sits under cartridge? If you cand see the piece of paper, maybe you can grab it with a tweezers. Otherways you will need to remove the front dor assembly and then the feed/transport section. With some technical skills, you will succed to put it back, but don't start if is the first time you disassemble an printer.

Here is a link to the manual in PDF format. http://www.lbrty.com/tech/Manuals_HP/90x0sm.pdf

if it always jams at the same place (fuser area) try another fuser or check the BLACK PLASTIC ASSY. THAT is mounted in the left door and takes the paper right after it comes out of the fuser ;part is called (PAPER DIVERTER) And sometimes one of the FLAPS That routes the paper is broken,hence causing paper jam.

have you remove the sealing tape from toner