HP laserjet 500-M551 very faint image after replacing main drive unit.

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  • Hansen88
    Service Manager

    Site Contributor
    1,000+ Posts
    • Dec 2009
    • 1020
    #1

    HP laserjet 500-M551 very faint image after replacing main drive unit.

    Replaced drive unit because of a noise issue. Now copies come out very faint,what image there is is mainly along the rear side,uneven. I have taken everything apart many times to try to see anything out of place from when the drive was replaced. The drive was timed properly as per the manual. Kind of at a loss at this point. Any help would be appreciated. I dont work on printers much so not real familiar with this machine.
    Tags: drive, image, replaced, unit
    • 1stcavvet
      Trusted Tech

      100+ Posts
      • Apr 2015
      • 231
      #2
      Re: HP laserjet 500-M551 very faint image after replacing main drive unit.

      sounds like a grounding issue, make sure the transfer roller is in properly. should be grounding on one end spring ---copper piece something. Stop the page half way check the toner cartridge if it prints good there it's the transfer. if not you lost a ground somewhere doing the drive unit GOOD LUCK

        Comment

        • Phil B.
          Field Supervisor

          10,000+ Posts
          • Jul 2016
          • 22808
          #3
          Re: HP laserjet 500-M551 very faint image after replacing main drive unit.

          Originally posted by Hansen88
          Replaced drive unit because of a noise issue. Now copies come out very faint,what image there is is mainly along the rear side,uneven. I have taken everything apart many times to try to see anything out of place from when the drive was replaced. The drive was timed properly as per the manual. Kind of at a loss at this point. Any help would be appreciated. I dont work on printers much so not real familiar with this machine.
          Did you have to remove the the HVPS(s) boards? Contacts not set right?
          Did you clean all the laser slits glass and even the laser mirrors/glass? And time I'm In that far on ANY unit I always do the above.
          Do you have a manual? PM me.

            Comment

            • Lance15
              Service Manager

              Site Contributor
              1,000+ Posts
              • Jun 2015
              • 1069
              #4
              Re: HP laserjet 500-M551 very faint image after replacing main drive unit.

              +1 for Phil's first point

              Make sure the HV boards contacts line up with the springs.

                Comment

                • Hansen88
                  Service Manager

                  Site Contributor
                  1,000+ Posts
                  • Dec 2009
                  • 1020
                  #5
                  Re: HP laserjet 500-M551 very faint image after replacing main drive unit.

                  Thanks for the replies. It makes sense it has to be something from when being taken apart. I have taken it back apart a few more times looking for what may have happened. All the spring contacts look good-touching. Here is some sample prints. What is on the page looks good. Almost looks like transfer problem.
                  Attached Files

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                    • Copeya
                      Technician
                      • Mar 2018
                      • 26
                      #6
                      Re: HP laserjet 500-M551 very faint image after replacing main drive unit.

                      I would definitely say that's transfer related.

                        Comment

                        • Lance15
                          Service Manager

                          Site Contributor
                          1,000+ Posts
                          • Jun 2015
                          • 1069
                          #7
                          Re: HP laserjet 500-M551 very faint image after replacing main drive unit.

                          Maybe these document will help?

                          Missing or Light Color Planes on Printouts.pdf

                          Troubleshooting Tools (PQ Issues, Noises, Engine Diags).pdf


                          Also, make 100% sure a connector didn't hide behind the DC Controller when you were putting things back together.

                            Comment

                            • Hansen88
                              Service Manager

                              Site Contributor
                              1,000+ Posts
                              • Dec 2009
                              • 1020
                              #8
                              Re: HP laserjet 500-M551 very faint image after replacing main drive unit.

                              Well we fixed the customer but not the printer. We got another printer for parts and changed all the parts that had anything to do with changing the drive unit and still no luck. So we put the second machine back together,cleaned it up ect and brought that one back to the customer.

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