SOURCE: how to enable duplex printing in hp laserjet 4250
This unit needs to have a duplex unit installed if you want to duplex. If the back of the unit is "flat" you do not have a duplexer installed.
the duplex unit slides into the back of the printer between the back door and the paper tray. when installed you will have a bulge on the back of the printer about 7 inches tall and the width of the printer that sticks out about 5 inches.
after installing the dupelxer you may need to enable it in the print driver under properties then the advanced tab you should see a spot for advanced settings.
SOURCE: 49. 2F05 SERVICE ERROR
It is probably both the fuser and the firmware.
Power Off/On and see if the firmware issue goes away.
From the control panel go to the Diagnostics Menu and select Print Event Log. It will give you a list of errors and what they pertain to, along with the page count when the event occurred.
Open the duplex pan (at the front of the printer, open the paper tray, and push the green button on the right in the tray cavity) and check for any small piece of paper that may be in the path. Verify that the hinge of the pan (where it connects to the printer chassis in the rear below the fuser assembly) is attached and not off its hinge. This can cause duplex jams. Additionally verify that the rear cover is not broken as the printer uses this to turn the paper.
Behind the rear cover is the fuser assembly. It may have a torn fixing film sleeve at one end or it may be contaminated, which can cause your image problem. It covers the ceramic heat element and sits above the lower pressure roller. One way to verify if the problem is the fuser is to print something from the control panel (like the configuration page located in the Information Menu). When the paper is under the cartridge but has not entered the fuser power off the printer. If the image mark is on the page its not the fuser because the paper hasn't gone there yet (try a new cartridge) if it is not on the page then the problem is the fuser.
SOURCE: hp laserjet p3005dn tray1 manual feed problem
you can choose mp first in "paper handing" printer menu or print tray1 is A4 default in properties of printer software.
SOURCE: Paper Jam at HP LaserJet P2055d
There is output sensor where the papers come out, make sure its lowered down, be VERY CAREFUL not to break it.
SOURCE: My HP Laserjet 2430dn makes a grinding noise after power on.
CHECK RS PRINTER PARTS FOR HP LASERJET 2400 2420 2430 PRINTER GEAR KIT
Causes of jams
NOTE If you are experiencing jams in the duplex paper path, make sure that the duplex-tray
lever is set to the correct media size for your country/region. Open the duplex-paper-path door
and look at the embossed arrow on the lever. Make sure that it points to the media size for your
country/region. If the size needs to be changed, push the lever all the way in for duplex printing
on letter- and legal-size media, or pull it all the way out for duplex printing on A4-size media.
A4
LTR,
LGL
A4
LTR,
LGL
Occasionally, paper or other print media can become jammed during a print job. Some causes include
the following events:
? The print media that is being used does not meet HP specifications.
? The media is damaged or has objects attached to it, such as staples or paper clips.
? The environment in which the print media was stored is too humid or too dry.
? The input trays are loaded incorrectly or overfilled, or the media guides are not set correctly.
? Too many sheets have accumulated in an output area, or sheets are blocking an output area.
? Media is added to or removed from an input tray during a print job or an input tray is removed from
the all-in-one during a print job.
? The cartridge door is opened during a print job.
ENWW
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