Page 2 of 4 FirstFirst 1234 LastLast
Results 11 to 20 of 38
  1. #11
    Service Manager 10,000+ Posts
    Cause for repeating black spot?

    Phil B.'s Avatar
    Join Date
    Jul 2016
    Location
    Raleigh NC
    Posts
    13,096
    Rep Power
    335

    Re: Cause for repeating black spot?

    Quote Originally Posted by bret@cos.flag.org View Post
    Thanks Phil.

    I haven't found that repeating defect guide in the service manual. But knowing it is there is good, I'll keep looking. I've done a search on the PDF for repepating and for defect. I figured that would work, but no luck yet.

    Thanks for the advice on uploading images, I'll check that out.

    I checked out the drum last night and it is actually a wear mark / scratch. No amount of rubbing on the drum was taking it off. I could feel it in the drum surface.

    I didn't have time to check the counts, it was already really late when I was able to get to the machine and all concerned were in a hurry to do the absolute minimum and head out.

    Yes the drums and toner are for sure genuine, gotten direct from Canon.

    The plan is that I put in a new black drum tonight.

    ok if there is a mark on the drum, is it in the same spot as the defect on the page? YES replace the drum unit in question. Is the mark on the end of the drum out of paper path?

  2. #12
    Trusted Tech 50+ Posts
    Join Date
    Jun 2020
    Location
    Florida
    Posts
    63
    Rep Power
    2

    Re: Cause for repeating black spot?

    Quote Originally Posted by bsm2 View Post
    Roll the paper until the spots match and that's the size of the part that is causing the marks

    fuser roller drum etc.......

    Old school trick
    Thanks. When I got inside the machine it was pretty obvious that it's the black drum. I'm getting a new one and will replace it, hopefully tonight. See photos that I just managed to upload.

  3. #13
    Service Manager 10,000+ Posts
    Cause for repeating black spot?

    Phil B.'s Avatar
    Join Date
    Jul 2016
    Location
    Raleigh NC
    Posts
    13,096
    Rep Power
    335

    Re: Cause for repeating black spot?

    Quote Originally Posted by bret@cos.flag.org View Post
    Attachment 49050

    Attachment 49051

    Hopefully I didn't reduce the images too much!
    yup replace the drum unit...

    as far as the question about organic drums... yes there are several type of non organic drums.... they are usually in higher speed/production models that can go 600k - 1mil pages. selenium drums required 'polishing' with a special powder and they could produce a poison (arsenic?) in the sludge removed from the polishing procedure ... organic drum are more for the lower end machines.

  4. #14
    Trusted Tech 50+ Posts
    Join Date
    Jun 2020
    Location
    Florida
    Posts
    63
    Rep Power
    2

    Re: Cause for repeating black spot?

    Quote Originally Posted by Phil B. View Post
    ok if there is a mark on the drum, is it in the same spot as the defect on the page? YES replace the drum unit in question. Is the mark on the end of the drum out of paper path?
    Yes the mark on the drum matches up with the location on the paper (on the edge of the sheet) so that pretty much confirms the drum and that wear spot/scratch on it is causing the print defect.

    Luckily if I rotate the paper so it is LTR-R, the spot is then out of the paper path and prints look good. That's the temporary work-around for this.

  5. #15
    Trusted Tech 50+ Posts
    Join Date
    Jun 2020
    Location
    Florida
    Posts
    63
    Rep Power
    2

    Re: Cause for repeating black spot?

    Quote Originally Posted by Phil B. View Post
    yup replace the drum unit...

    as far as the question about organic drums... yes there are several type of non organic drums.... they are usually in higher speed/production models that can go 600k - 1mil pages. selenium drums required 'polishing' with a special powder and they could produce a poison (arsenic?) in the sludge removed from the polishing procedure ... organic drum are more for the lower end machines.
    Wow, I had no idea there were such advanced (dangerous?) drums. Glad to know we have organic drums.

  6. #16
    Master Of The Obvious 10,000+ Posts
    Cause for repeating black spot?

    blackcat4866's Avatar
    Join Date
    Jul 2007
    Location
    Lapeer, Michigan
    Posts
    19,336
    Rep Power
    353

    Re: Cause for repeating black spot?

    Quote Originally Posted by bret@cos.flag.org View Post
    ...
    Good to know the circumference of a drum. Why do you say "organic drum"? Are there non-organic drums?
    When I first started doing this there were Selenium Tellurium drums, Arsenic TriSelenide drums, and Cadmium drums. Then came Organic drums and Silicon drums, and that's mostly all that you'll see now.

    I remember hearing about somebody who died of Selenium poisioning that worked in one of the drum manufacturing facilities. But it was incredibly unlikely that a tech could get a lethal dose of Selenium just installing drums.
    =^..^=
    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 =^..^=

  7. #17
    Service Manager 2,500+ Posts tsbservice's Avatar
    Join Date
    May 2007
    Posts
    3,846
    Rep Power
    175

    Re: Cause for repeating black spot?

    Quote Originally Posted by Phil B. View Post
    ok if there is a mark on the drum, is it in the same spot as the defect on the page? YES replace the drum unit in question. Is the mark on the end of the drum out of paper path?
    Those are repeative you know. I like to print it on A3 paper and measure the distance then divide the result by 3.14. Then measure/compare some more diameters
    Often drums and heat rollers have very similar circumference so precision is important just rolling paper and comparing with cylinder inside machine isn't enough.
    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.

  8. #18
    Retired 10,000+ Posts slimslob's Avatar
    Join Date
    May 2013
    Location
    Bakersfield, CA
    Posts
    14,462
    Rep Power
    391

    Re: Cause for repeating black spot?

    Quote Originally Posted by blackcat4866 View Post
    When I first started doing this there were Selenium Tellurium drums, Arsenic TriSelenide drums, and Cadmium drums. Then came Organic drums and Silicon drums, and that's mostly all that you'll see now.

    I remember hearing about somebody who died of Selenium poisioning that worked in one of the drum manufacturing facilities. But it was incredibly unlikely that a tech could get a lethal dose of Selenium just installing drums.
    =^..^=
    The problem came in when someone the wrong polishing compound on the Arsenic TriSelenide drums. It could release arsenic gas, the most dangerous form of arsenic.

  9. #19
    Service Manager 10,000+ Posts
    Cause for repeating black spot?

    Phil B.'s Avatar
    Join Date
    Jul 2016
    Location
    Raleigh NC
    Posts
    13,096
    Rep Power
    335

    Re: Cause for repeating black spot?

    Quote Originally Posted by tsbservice View Post
    Those are repeative you know. I like to print it on A3 paper and measure the distance then divide the result by 3.14. Then measure/compare some more diameters
    Often drums and heat rollers have very similar circumference so precision is important just rolling paper and comparing with cylinder inside machine isn't enough.
    Yeah a while back the rollers were different sizes. So the rolled paper trick could be used pretty well.
    But in today's time that trick is out the window.

    Sent from my SM-G960U using Tapatalk

  10. #20
    Trusted Tech 50+ Posts
    Join Date
    Jun 2020
    Location
    Florida
    Posts
    63
    Rep Power
    2

    Re: Cause for repeating black spot?

    Ok, I changed out the black drum, and the repeating black spot went away. I ran color calibrations last night and all was well.

    Now today the users are saying the colors are not properly aligned. They're trying to run the Auto Correct Color mismatch and it is saying that it was cancelled and to try running it again, and if that fails to call Support. So they're calling me.

    Any ideas what might cause that to fail? Obviously it could be something to do with the drum just installed, but would I need to go back there and open up the machine again? If so any recommendations as to what to look for? All seemed fine when I left it yesterday.

    Thanks.

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Get the Android App
click or scan for the Copytechnet Mobile App

-= -= -= -= -=


IDrive Remote Backup

Lunarpages Internet Solutions

Advertise on Copytechnet

Your Link Here