HP LJ 4240

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  • copyman
    Owner / Technician

    Site Contributor
    2,500+ Posts
    • Sep 2005
    • 4524
    #1

    HP LJ 4240

    I went to install a maint kit in this new account. When I got there prints were coming straight out the back, didn't think anything of it. I went ahead and installed the kit. When I was done it was jamming if I tried to use the top output. That explained why the customer used straight out exit.

    I saw what the problem was right away. The gears from fuser were not meshing with top output gears. I could not see what was causing this. Everything looked ok. For a temporary fix I put folded cardboard under fuser so gears would mesh. Worked fine but need to go back with permanent fix.

    Any idea what would cause this.

    Thanks in advance
    Tags: None
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22929
      #2
      Re: HP LJ 4240

      This machine appears to be a close relative of the 4200/4250. These machine experience wear at the swing plate (fuser coupler gears).

      This is what you need:
      HP LaserJet 4240n Swing Plate, Genuine (A7827)

      If you haven't been into one of these, It's not a small undertaking. For those of us that have done it a few times it takes 75 minutes. The first time is usually quite a bit longer. =^..^=
      If you'd like a serious answer to your request:
      1) demonstrate that you've read the manual
      2) demonstrate that you made some attempt to fix it.
      3) if you're going to ask about jams include the jam code.
      4) if you're going to ask about an error code include the error code.
      5) You are the person onsite. Only you can make observations.

      blackcat: Master Of The Obvious =^..^=

        Comment

        • JustManuals
          Field Supervisor

          5,000+ Posts
          • Jan 2006
          • 9838
          #3
          Re: HP LJ 4240

          Here is a link to the HP fix. The link will be valid for 90 days and 500 downloads.

          https://www.yousendit.com/download/W...bEp3TGowZXNUQw


          Paul@justmanuals.com

            Comment

            • copyman
              Owner / Technician

              Site Contributor
              2,500+ Posts
              • Sep 2005
              • 4524
              #4
              Re: HP LJ 4240

              Thanks blackcat but I already tried that. Sorry forgot to mention that the swing plate was done at same time I put the maint kit in. When the customer said jamming at fuser and noisy I brought SS gear assy with me and replaced it. That was about the 10th SS gear assy I have installed. Don't even need the instructions anymore....well maybe a few glances at them :-)

              Don't think the swing set gear drives the top output? I thought a gear on top of fuser unit drove the top output rollers? That is the reason why it worked when I folded up a piece of cardboard and put under fuser unit.

                Comment

                • blackcat4866
                  Master Of The Obvious

                  Site Contributor
                  10,000+ Posts
                  • Jul 2007
                  • 22929
                  #5
                  Re: HP LJ 4240

                  That's a new one for me. I've never had any problems with the exit assembly on a 4200/4240/4250 series. Let me know what you discover.
                  =^..^=
                  If you'd like a serious answer to your request:
                  1) demonstrate that you've read the manual
                  2) demonstrate that you made some attempt to fix it.
                  3) if you're going to ask about jams include the jam code.
                  4) if you're going to ask about an error code include the error code.
                  5) You are the person onsite. Only you can make observations.

                  blackcat: Master Of The Obvious =^..^=

                    Comment

                    • Iowatech
                      Not a service manager

                      2,500+ Posts
                      • Dec 2009
                      • 3930
                      #6
                      Re: HP LJ 4240

                      I don't know if any of this is relevant, but in some of HP machines the bushings for the drive gears on the fusing unit go bad. Might try a new fusing unit.
                      For what it is worth, you might also try to see if the swing plate is actually swinging as needed.
                      Last edited by Iowatech; 11-04-2012, 01:19 AM. Reason: Stupid punctuastion error

                        Comment

                        • copyman
                          Owner / Technician

                          Site Contributor
                          2,500+ Posts
                          • Sep 2005
                          • 4524
                          #7
                          Re: HP LJ 4240

                          going out to take a closer look. will let you know what I find

                            Comment

                            • Wild Bill
                              Senior Tech

                              500+ Posts
                              • Jul 2005
                              • 774
                              #8
                              Re: HP LJ 4240

                              FYI 4240, 4250, 4350 are all in the same family of printers and definetly have the swing plate assembly problem; 4200, 4300 not so much...

                              Replace the swingplate assembly... that is the solution.
                              Izzy

                                Comment

                                • copyman
                                  Owner / Technician

                                  Site Contributor
                                  2,500+ Posts
                                  • Sep 2005
                                  • 4524
                                  #9
                                  Re: HP LJ 4240

                                  Bill, I posted in my reply that the swing set gear assy was replaced when I installed the maint kit.

                                    Comment

                                    • prntrfxr
                                      Service Manager

                                      1,000+ Posts
                                      • Apr 2008
                                      • 1627
                                      #10
                                      Re: HP LJ 4240

                                      Did you check the Pendulum drive assembly? RM1-0002-020CN. This is what makes the fuser drive the delivery (output) assembly. We sell refurbished ones. This should engage the fuser gears when the rear cover actuates it. Either the post on the rear cover RM1-0027-020CN is broken or there is something preventing the gears from swinging into position. If you push on the plastic piece the post normally actuates the pendulum gears should mesh with the fuser gears.
                                      Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways - Coke in one hand - chocolate in the other - body thoroughly used up, totally worn out and screaming "WOO-HOO, what a ride!".

                                        Comment

                                        • Wild Bill
                                          Senior Tech

                                          500+ Posts
                                          • Jul 2005
                                          • 774
                                          #11
                                          Re: HP LJ 4240

                                          Main drive assembly gear

                                          RM1-1066
                                          Izzy

                                            Comment

                                            • copyman
                                              Owner / Technician

                                              Site Contributor
                                              2,500+ Posts
                                              • Sep 2005
                                              • 4524
                                              #12
                                              Re: HP LJ 4240

                                              This is what I did to fix:

                                              Loosen power supply screws and moved pwr supply up

                                              Put screwdriver in pwr supply hole with fuser unit out and bent up top of pwr supply.

                                              The reason this worked was fuser sits on top of pwr supply plate.

                                              Gears meshing fine now.

                                              Thanks again for all the suggestions.

                                                Comment

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