CS/KM 420i dark 1 edgefrom glass only

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  • Gar the pilot
    • May 2025
    #1

    [CQ] CS/KM 420i dark 1 edgefrom glass only

    the CS420i prints a dark edge from the glass only, and only in 11X8.5 direction. Prints and ADF are okay. If I copy duplex, it comes out dark on the same edge but the image is printed opposite direction in other words its not the drum/Dv ETC. Scanner looks like it goes smothly and we cannot Visually detect any fluctation in brightness of the lamp. Firmware was up-graded with no change.
    Hoping to install next week,
    Thanks Gar the pilot
    finally getting flying weather, Wednesday night was nice up-stairs
    Tags: None
    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 22973
      #2
      Re: CS/KM 420i dark 1 edgefrom glass only

      I think I'd start by checking the DP height and positioning. Like all plastic frame document feeders it's nearly impossible to level all four corners. But if you can get the two corners by the slit glass and the one corner by the opposing hinge down around the right height it will be as close as anybody can get it. If you can't get it levelled up, you may need to replace the DP hinges. This machine is old enough that you might see that. Also check that the white matt is in good condition, and properly attached.

      I think what's happening is that your original is statically attracting to the white matt, and the matt just isn't close enough to the glass. One way to test this theory is to lay 20 sheets of paper on top of your test original OC (sorry, "OC" is Sharp-speak for "on the contact-glass") then try again. Copies should look fine.

      If the DP images are good then you can rule out the lamp. =^..^=
      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

        • Gar the pilot
          #3
          Re: CS/KM 420i dark 1 edgefrom glass only

          I just tried the 20 sheet white paper and no change. White matt =okay. It is the front side of the glass, so bottem of the Original thats dark. It is not just a solid dark but a gray with darker lines and varys 3/4 inch to 1,1/4inch.with the first 1/2 inch white. Kind of hard to explane. Almost makes me think of a flat sopt on the scanner rollers but wont repete consistantly down the page.

            Comment

            • blackcat4866
              Master Of The Obvious

              Site Contributor
              10,000+ Posts
              • Jul 2007
              • 22973
              #4
              Re: CS/KM 420i dark 1 edgefrom glass only

              Can you do a scan? Let's see.

              Perhaps one of the mirrors is loose, spring clip fell out.

              Canon had an anolog, years back (NP-3050) that had a light blocking curtain that fitted around the lens. As these machines aged the curtain would tear free at the ends, and produce really interesting black and gray silhouettes on the copies. The moral of this long drawn out narration, is that you might have something loose in amongst the optics blocking the light path back to the CCD. =^..^=
              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

                • Gar the pilot
                  #5
                  Re: CS/KM 420i dark 1 edgefrom glass only

                  Clips all inplace,.. pulled lens Blocker no diff. Just moved the scan wire position on the front side of the scanner and it got better, I may be on to it. will report back if I can dial it in right with moving the scan wire possition
                  Gar

                    Comment

                    • blackcat4866
                      Master Of The Obvious

                      Site Contributor
                      10,000+ Posts
                      • Jul 2007
                      • 22973
                      #6
                      Re: CS/KM 420i dark 1 edgefrom glass only

                      Be sure to mark it first. Sometimes it can be difficult to recover from these kind of scanner adjustments. =^..^=
                      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

                        • Gar the pilot
                          #7
                          Re: CS/KM 420i dark 1 edgefrom glass only

                          I marked it good and then found one of the skidder/foot of the mirror B was missing. I used a foot from an old Ai 3010 we have for parts and with a little mod it fits and fixed the problem. 30+ years and first time I ran into this one. Repositioned to the marks and all is good. Found the foot in a corner of the scanner unit under the rail and it was broken/unuseable. WOW Anyways,.. Big thanks for the help and have a good weekend
                          Gar

                            Comment

                            • blackcat4866
                              Master Of The Obvious

                              Site Contributor
                              10,000+ Posts
                              • Jul 2007
                              • 22973
                              #8
                              Re: CS/KM 420i dark 1 edgefrom glass only

                              The CS-1635/1650/2050/2550 are known for this. Sorry I didn't mention it. Most of the time the slider is partway popped off so that the scanner component is riding high, rather than riding low, but in the end it changes the mirror focus in a similar way. I was putting a dab of superglue between the slider and the scanner component to keep it secure.

                              Congratulations on a successful fix. =^..^=
                              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

                                • Gar the pilot
                                  #9
                                  Re: CS/KM 420i dark 1 edgefrom glass only

                                  And to top off the sucess, I got to go Flying this weekend. I did some Transion Training for a Cessna 150/172 Pilot into a Cessna 175 with a stol kit and 180 hp conversion. Lots of fun-in-the-sun, dancing in the clouds.
                                  Gar

                                    Comment

                                    • blackcat4866
                                      Master Of The Obvious

                                      Site Contributor
                                      10,000+ Posts
                                      • Jul 2007
                                      • 22973
                                      #10
                                      Re: CS/KM 420i dark 1 edgefrom glass only

                                      I'm jealous. I'm hopping around like a one-legged rabbit. Definitely grounded. =^..^=
                                      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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