Toshiba 357 Horizontal lines

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  • Edward
    Technician
    • May 2019
    • 32
    #1

    Toshiba 357 Horizontal lines

    Here is a good one. I have a Toshiba 357 with a strange problem. I went to replace a worn drum on this copier and after it was installed I got Horizontal thin lines randomly all over the page. Some are partially across and the other all the way.
    I reinstalled the old drum and it works fine. I replaced with another new drum same problem. I order new drum from reputable aftermarket source. Name starts with a K. I installed that drum same problem. They are aftermarket drums. I reinstalled the old drum and it works fine. I have replaced the charge assembly to no avail . I checked the drum ground and they are all fine. The only difference in the new drums and the old one is that the conductive coating is all the way to the ends of the old drum. Its like the new ones are arcing with the charger in the exposed area of the drum. The exposed metal on these Known good drums are the same as the Oem Checked the high voltage connector on the frame in the back and it is not cracked. I notice a little developer on a couple bands. I checked the developer material for debris. I am going to try another dev. housing thinking the Developer spacers are worn but I fell doubtful about that. Thanks for any opinion
    Tags: developer, drum, drums, fine
    • SalesServiceGuy
      Field Supervisor

      Site Contributor
      5,000+ Posts
      • Dec 2009
      • 8207
      #2
      Re: Toshiba 357 Horizontal lines

      ... order a Toshiba OEM drum.

        Comment

        • blackcat4866
          Master Of The Obvious

          Site Contributor
          10,000+ Posts
          • Jul 2007
          • 23008
          #3
          Re: Toshiba 357 Horizontal lines

          Did you remember to transfer the rear drum bushing over to the new drum?
          Did you replace the blade and prime the new blade?
          Did you reset the counters and run the calibration?

          =^..^=
          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

            • Edward
              Technician
              • May 2019
              • 32
              #4
              Re: Toshiba 357 Horizontal lines

              Originally posted by SalesServiceGuy
              ... order a Toshiba OEM drum.
              Its not the drums. Its a High Voltage arc. Got another machine in same office. I have put the drums in it and it is fine.
              Its the same symptoms as a loose screw on the high voltage charge contact in rear of machine. The fact that I mentioned
              the old drum works is that the coating goes all the way to each end of the drum . The drums that are made correctly are arcing because they have the correct coating and are picking up the arc because the arcing is right over the bare area most likely. I proved the drums out of the equation. I never have had the need for Oem drums, in 38 years

                Comment

                • Edward
                  Technician
                  • May 2019
                  • 32
                  #5
                  Re: Toshiba 357 Horizontal lines

                  Originally posted by blackcat4866
                  Did you remember to transfer the rear drum bushing over to the new drum?
                  Did you replace the blade and prime the new blade?
                  Did you reset the counters and run the calibration?

                  =^..^=

                  Yes, yes yes and yes. I am figuring to take some black electrical tape and tape over the charge corona so there is no charge over the any bare are of the drum to simulate the coating on the installed China drum that has the coating all the way to each edge of the drum then try the new drums. I almost know this will RIG it but I still have a weird problem after that. Thank you

                    Comment

                    • Edward
                      Technician
                      • May 2019
                      • 32
                      #6
                      Re: Toshiba 357 Horizontal lines

                      The solution was to replace the developer housing. Solved issue. Gap rollers were was worn just enough on one part to allow for arcing to occur

                        Comment

                        • blackcat4866
                          Master Of The Obvious

                          Site Contributor
                          10,000+ Posts
                          • Jul 2007
                          • 23008
                          #7
                          Re: Toshiba 357 Horizontal lines

                          Congratulations on your success!

                          Another thing to watch for on those developing units is the mag roller shaft wearing, changing the doctor blade gap. The first clue is usually a very loud buzzing sound, when the pattern on the mag roller starts rubbing on the doctor blade. =^..^=
                          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

                            • Rusty.Harris
                              Senior Tech

                              Site Contributor
                              500+ Posts
                              • Jan 2021
                              • 632
                              #8
                              Re: Toshiba 357 Horizontal lines

                              Yeah, those spacers on the dev units wear down. I just have my techs toss the things if they have CQ issues over 500k on the dev units.
                              Too much of a PITA to replace them, and the mag roller when it wears down. Sometimes you can catch it when it starts wearing down by
                              looking at the ends of the drum. They appear "buffed".



                              Originally posted by Edward
                              The solution was to replace the developer housing. Solved issue. Gap rollers were was worn just enough on one part to allow for arcing to occur

                                Comment

                                • tsbservice
                                  Field tech

                                  Site Contributor
                                  5,000+ Posts
                                  • May 2007
                                  • 8019
                                  #9
                                  Re: Toshiba 357 Horizontal lines

                                  Originally posted by Rusty.Harris
                                  Yeah, those spacers on the dev units wear down. I just have my techs toss the things if they have CQ issues over 500k on the dev units.
                                  Too much of a PITA to replace them, and the mag roller when it wears down. Sometimes you can catch it when it starts wearing down by
                                  looking at the ends of the drum. They appear "buffed".
                                  Old skull cheap Toshy. Put there damn bearings and forget silly plastic collars/spacers - that plus NOT replace oil seals replace whole developer unit at 500/600k pretty much should solve whole mess.
                                  A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.
                                  Blessed are they who can laugh at themselves, for they shall never cease to be amused.

                                    Comment

                                    • Rusty.Harris
                                      Senior Tech

                                      Site Contributor
                                      500+ Posts
                                      • Jan 2021
                                      • 632
                                      #10
                                      Re: Toshiba 357 Horizontal lines

                                      Originally posted by tsbservice
                                      Old skull cheap Toshy. Put there damn bearings and forget silly plastic collars/spacers - that plus NOT replace oil seals replace whole developer unit at 500/600k pretty much should solve whole mess.

                                      Boy don't get me started on the "oil" seals. When we started having issues with the 8508 series developer units leaking developer,
                                      IN THE WINTER, when I rebuilt the first one, I read the book, just to be sure I wasn't missing something, and the instructions didn't
                                      have you put the Alvania #2 grease on the OIL seals. So I went into the instructions for the 5540 series machines and they say to put
                                      the grease in the seals. Called the hotline, they said don't put the grease on the seals.
                                      So, I didn't. Then we had one come back a few months later blown out the seals. THIS time I put the grease in the seals. Never had
                                      another issue.
                                      Then, I pulled the part number for the oil seal, and listed every machine that used that part, which, from the 4401 part number, was
                                      A LOT of machines. Then, I went to the service manuals I had for the older machines I could find and cross referenced it to the ones
                                      where they say DON'T put the grease in. Interesting...the ones they DON'T want the grease in, were the ones we had trouble with the
                                      developer leaking out. So, we started putting the grease in those and our problems with leaking stopped. We only really had problems
                                      in the winter, when it gets cold, the humidity goes DOWN, heat comes on and the RUBBER would dry out, hince the need for the grease
                                      on the OIL seals (which they conveniently renamed v-ring seals).

                                      Photo is a list of all the machines on ribon that use the v-ring seal...the hightlighted ones are the ones the book tells you NOT to use
                                      the alvania #2 grease, which we started using again.

                                      Oil Seals_Machines.jpg

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