DP-770 with J9000 jams

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  • blackcat4866
    Master Of The Obvious

    Site Contributor
    10,000+ Posts
    • Jul 2007
    • 22999
    #1

    DP-770 with J9000 jams

    I swapped the paper present sensor with another to confirm that the sensor was OK. The key, for me, was that when one original was inserted and fed, the DP continued to attempt pickup, even though the one original had already completely exited. And when you re-installed the same one original, I insisted that it wanted more originals.

    Another forum post confirmed for me that it was something to do with the paper present sensor, but what?

    While I was watching the paper present flag I noticed that it bounced when the flag dropped. So the DP controller saw the signal go from On to Off/On/Off. The flag is only gravity operated, so I added a very very weak torsion spring to damp that bounce. To make sure that the spring tail didn't move around I carved a small groove in the frame and gave it a dab of Lazerbond (my new favorite glue). A counterweight may have served the same purpose.

    Afterwards I made 30 separate scans without the J9000.

    J9000_1.JPGJ9000_2.JPG

    In that forum post tmaged refers to adding a black tape extension to the flag. I think that helps because the tape adds counterweight to damp the bounce also. I think the sensor flag is long enough, just shouldn't bounce. =^..^=
    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 =^..^=
    Tags: None
    • Has Been
      Technician
      • Nov 2012
      • 48
      #2
      Re: DP-770 with J9000 jams

      Originally posted by blackcat4866
      I swapped the paper present sensor with another to confirm that the sensor was OK. The key, for me, was that when one original was inserted and fed, the DP continued to attempt pickup, even though the one original had already completely exited. And when you re-installed the same one original, I insisted that it wanted more originals.

      Another forum post confirmed for me that it was something to do with the paper present sensor, but what?

      While I was watching the paper present flag I noticed that it bounced when the flag dropped. So the DP controller saw the signal go from On to Off/On/Off. The flag is only gravity operated, so I added a very very weak torsion spring to damp that bounce. To make sure that the spring tail didn't move around I carved a small groove in the frame and gave it a dab of Lazerbond (my new favorite glue). A counterweight may have served the same purpose.

      Afterwards I made 30 separate scans without the J9000.

      [ATTACH=CONFIG]32905[/ATTACH][ATTACH=CONFIG]32906[/ATTACH]

      In that forum post tmaged refers to adding a black tape extension to the flag. I think that helps because the tape adds counterweight to damp the bounce also. I think the sensor flag is long enough, just shouldn't bounce. =^..^=
      Has the small tab on front of the roller holder been broken off ?

        Comment

        • blackcat4866
          Master Of The Obvious

          Site Contributor
          10,000+ Posts
          • Jul 2007
          • 22999
          #3
          Re: DP-770 with J9000 jams

          Originally posted by Has Been
          Has the small tab on front of the roller holder been broken off ?
          No, I checked for that. =^..^=
          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

            • subaro
              Service Manager

              1,000+ Posts
              • Oct 2010
              • 1274
              #4
              Re: DP-770 with J9000 jams

              You were right on track there blackcat. see the bulletin. the cut off is shaving off the middle of the actuator in a C type manner OR just making a curve on the original actuator.


              There is a bulletin for this jam on the dp-770

              QA E187

              Due to the parts variation, the original detection SW actuator may come in contact with the original lift plate and
              vibrate after the final original is fed. When it occurs, the light interruption time of the original detection switch
              becomes shorter and the J9000 (No original feed JAM) may be detected. As a preventative measure, the
              following change is implemented.


              [Change to the original detection SW actuator (No.1)](Old) (New)
              It is cut off here
              so it does not
              come in contact
              with the original
              lift plate
              THE ONLY THING FOR EVIL TO TRIUMPH IS FOR GOOD MEN TO DO NOTHING..........edmund burke

                Comment

                • subaro
                  Service Manager

                  1,000+ Posts
                  • Oct 2010
                  • 1274
                  #5
                  Re: DP-770 with J9000 jams

                  Here is the part number for the new actuator.


                  303LL07281
                  THE ONLY THING FOR EVIL TO TRIUMPH IS FOR GOOD MEN TO DO NOTHING..........edmund burke

                    Comment

                    • blackcat4866
                      Master Of The Obvious

                      Site Contributor
                      10,000+ Posts
                      • Jul 2007
                      • 22999
                      #6
                      Re: DP-770 with J9000 jams

                      Thanks for the bulletin and part number subaro. =^..^=
                      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

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