HP DesignJet T830 - not detecting paper

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  • kuby
    Senior Tech

    1,000+ Posts
    • Oct 2007
    • 1346

    HP DesignJet T830 - not detecting paper

    Working on a T830 that keeps saying that it can not detect the paper either Roll or from the Multi Sheet tray. Have replaced that OOP sensor as pre the tests ran and said that is what needed replaced. Still saying it can not detect any paper. It will roll in the paper or take it from the Multi Sheet tray but keeps saying when you try and copy or print that it can not detect the paper. Anyone else work on these had this problem? Thanks
  • Kiran Otter
    Service Manager

    Site Contributor
    1,000+ Posts
    • Dec 2013
    • 1098

    #2
    Re: HP DesignJet T830 - not detecting paper

    It's the line sensor attached to the carriage. Very easy to replace. CQ890-67001

    However, you may have ink from the service station fouling the sensor. So I would take the old one out and inspect it. If it's coated with ink, you may want to consider replacing the service station and checking for a ink leak from the printhead.

    Kiran

    Comment

    • D Hook
      Trusted Tech

      100+ Posts
      • Mar 2018
      • 205

      #3
      Re: HP DesignJet T830 - not detecting paper

      Kiran nails it. I just replaced the service station on a T730 (same printer minus the scanner) due to the problem you describe above. This one was doing the exact same thing; showing the paper error you detailed. The previous owner had a worn printhead that wasn't printing very well so he kept doing cleaning cycles on it. And then the black begin to leak. It left so much ink on the service station it kept picking up ink and smearing across the paper and fouling the line sensor. Ended up having to just replace the whole service station (and the print head). There's that little brush you can see on the right hand side of the carriage when it's parked that I think is meant to keep the line sensor clean. This one was completely soaked with ink and hardened. Quite the mess. Now it's back up and running and happy. For what it is, it does nice line prints and is fast, compared to others. But the cost of that printhead....wowser! I found one on Ebay from Japan for a lot less, $284 delivered. And Kiran sent me a link for the service station. Around $125 + shipping. It's a pretty easy fix.

      EDIT: FYI, it took about 3 weeks to get the printhead. I was a bit wary of buying from overseas since I didn't know if there was a region compatibility issue or not but it worked just fine.
      Last edited by D Hook; 02-24-2022, 02:06 PM.

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      • kuby
        Senior Tech

        1,000+ Posts
        • Oct 2007
        • 1346

        #4
        Re: HP DesignJet T830 - not detecting paper

        Thanks guys will try that and let you know.

        Comment

        • kuby
          Senior Tech

          1,000+ Posts
          • Oct 2007
          • 1346

          #5
          Re: HP DesignJet T830 - not detecting paper

          Thanks guys for the help in getting the machine up and running again. Back in the customers office. Yes

          Thanks

          Comment

          • Blind Avocado
            Technician
            • Jan 2021
            • 37

            #6
            Re: HP DesignJet T830 - not detecting paper

            I have a T830 doing this. I have replaced the service station and the line sensor, and an hour later it went back to not loading paper. Is there a calibration I need to do after these replacements? What else could be causing the problem. Thank you for any help you can provide!

            Comment

            • Kiran Otter
              Service Manager

              Site Contributor
              1,000+ Posts
              • Dec 2013
              • 1098

              #7
              Re: HP DesignJet T830 - not detecting paper

              I'd check your work on the line sensor replacement. And there should be a test for the line sensor in the diagnostics menu you can run which will tell you if it's the problem or not. Make sure the encoder strip is clean.

              Kiran

              Comment

              • copiertec
                Service Manager

                Site Contributor
                1,000+ Posts
                • Jan 2016
                • 2175

                #8
                Re: HP DesignJet T830 - not detecting paper

                I'm having the same issues and replaced the OOPS sensor but still am having load paper issues. Where is the line sensor located? I see the sensors on page 224 of the service manual but not sure which one is the line sensor. Update, I found it. Its located on the printhead.
                Last edited by copiertec; 10-11-2023, 02:15 PM.

                Comment

                • john_t_03
                  Junior Member
                  • Apr 2024
                  • 4

                  #9
                  Re: HP DesignJet T830 - not detecting paper

                  Thank you so much for the helpful info above. When my DJ T830 stopped detecting the paper roll, I found this thread and inspected the print head to discover a massive leak from it. I followed the instructions to remove the right cover to confirm that the leak extended down to the line sensor, brush and all the areas around and below them. I just ordered a new service station and print head on Ebay. I am a little intimidated by the service station replacement, but the manual is pretty detailed. My question: do I need any other replacements parts (line sensor, etc.) and what else should I watch out for in replacing the SS?

                  Comment

                  • Kiran Otter
                    Service Manager

                    Site Contributor
                    1,000+ Posts
                    • Dec 2013
                    • 1098

                    #10
                    Re: HP DesignJet T830 - not detecting paper

                    The hardest part of replacing the service station, I find, is the little vacuum tube and the T fitting that snaps into a holder on the service station. Take a real good look at it before taking it apart, and follow the service manual. Also just getting the service station out sometimes is a challenge. Helps to push down on it while pulling it out. Be careful with it because it will be full of fluid ink and is easy to spill.

                    I've had them with fouled line sensors but I just removed the screw holding it to the carriage and cleaned it without removing/disconnecting it.

                    Kiran

                    Comment

                    • blackcat4866
                      Master Of The Obvious

                      Site Contributor
                      10,000+ Posts
                      • Jul 2007
                      • 22786

                      #11
                      Re: HP DesignJet T830 - not detecting paper

                      Originally posted by Kiran Otter
                      ... I've had them with fouled line sensors but I just removed the screw holding it to the carriage and cleaned it without removing/disconnecting it.

                      Kiran
                      I'm always loathe to disconnect any ribbon cable I don't have to. They damage far too easily. This is my preference too. =^..^=
                      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

                      • john_t_03
                        Junior Member
                        • Apr 2024
                        • 4

                        #12
                        Re: HP DesignJet T830 - not detecting paper

                        Originally posted by Kiran Otter
                        The hardest part of replacing the service station, I find, is the little vacuum tube and the T fitting that snaps into a holder on the service station. Take a real good look at it before taking it apart, and follow the service manual. Also just getting the service station out sometimes is a challenge. Helps to push down on it while pulling it out. Be careful with it because it will be full of fluid ink and is easy to spill.

                        I've had them with fouled line sensors but I just removed the screw holding it to the carriage and cleaned it without removing/disconnecting it.

                        Kiran
                        Thank you for the tip. Now, I just have to wait for the goods to come from Japan

                        Comment

                        • Kiran Otter
                          Service Manager

                          Site Contributor
                          1,000+ Posts
                          • Dec 2013
                          • 1098

                          #13
                          Re: HP DesignJet T830 - not detecting paper

                          Japan?? You're in Boston... why not order it directly from HP?

                          Kiran

                          Comment

                          • john_t_03
                            Junior Member
                            • Apr 2024
                            • 4

                            #14
                            Re: HP DesignJet T830 - not detecting paper

                            Originally posted by Kiran Otter
                            Japan?? You're in Boston... why not order it directly from HP?

                            Kiran
                            The print head is from a Japanese seller on Ebay - it was half the price of buying from HP. The service station was from a US seller and should be here in soon.

                            Comment

                            • john_t_03
                              Junior Member
                              • Apr 2024
                              • 4

                              #15
                              Re: HP DesignJet T830 - not detecting paper

                              I just installed the new service station and print head and everything is back in working order! The trickiest part of the service station install was disconnecting and reconnecting the tube with the tight clearances around the unit. I cleaned the paper sensor and didn't have to replace it. I couldn't do the PMK2 reset that was recommended - couldn't figure out how to get to that menu. Thanks for all the help!

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