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printing defect

Product Name: Phaser 7760
Operating System: Mac OS X 10.11 - El Capitan

2019-03-15 11.30.02.jpg11x17

I am having a problem with printing defects on my Phaser 7760. I am getting dark lines every 44mm in all colors in the same hue as whatever is printed. I switched out all of my Imaging Units, new transfer roller, and waste cartridge. I tried different papers with the same result. The lines do not appear in areas that have no toner. Test prints all have the same issue. My OS is actually Mac OS 10.6.8 on an old computer that can't upgrade to a newer OS. My main computer OS 10.14.3 Mojave will no longer support the old driver. I've ordered more imaging units and a belt cleaner assembly. The toner is Xerox brand. The only thing I haven't replaced is the fuser and belt cleaner. Thanks in advance.

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10 Replies
Analyst Nation Moderator Joe053204-hcl
Analyst Nation Moderator

Re: printing defect

The Repeating Defects Page is a tool that can be used for troubleshooting print quality issues that have a consistent, repeating pattern.

  1. Press the [Up] or [Down] arrow button until 'Troubleshooting' is selected, then press the [OK] button.
  2. Press the [Up] or [Down] arrow button until 'Print Quality Problems' selected, then press the [OK] button.
  3. Press the [Up] or [Down] arrow button until 'Repeating Defects Page' is selected, then press the [OK] button to print the page.

The Repeating Defects Page is a tool that can be used for troubleshooting print quality issues that have a consistent, repeating pattern. For example, a smear that occurs every 44 mm / 1.7 in. down the page.

To determine the cause of the defect:

  1. Print the Repeating Defects Page.
  2. Print eight pages on A4 size (210 x 297 mm / 8.27 x 11.69 in.) or Letter size (216 x 279 mm / 8.5 x 11 in.) paper, in the long-edge feed (LEF) direction from any paper tray.
  3. Print four pages on Tabloid size (279 x 432 mm / 11 x 17 in.) paper, in the short-edge feed (SEF) direction.
  4. Measure the distance between the repeating defects using the same reference point (for example, from the top of the first defect to the top of the next defect), and then use the Repeating Defects Page and the following table to determine the cause of the defect.
Component Repeating Distance (Metric) Repeating Distance (Imperial)
Accumulator Belt Every four pages of A4 or Letter size paper printed LEF, or on every other page of Tabloid size paper printer SEF.
Fuser 84 mm 3.3 in.
Fuser or Imaging Unit 94 mm 3.7 in.
Transfer Roller 88 mm 3.5 in.
Imaging Unit 44 mm 1.7 in.
Developer Roller 28.3 mm 1.1 in.

NOTE: If it is determined that the Accumulator Belt or Developer Roller is the cause of the repeating defect, contact Support for additional assistance. All other components can be replaced without Service.

Please be sure to select "Accept Solution" and or select the thumbs up icon to enter Kudos for posts that resolve your issues. Your feedback counts!

Joe.
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Technical Escalation User DavidX28897-xrx
Technical Escalation User

Re: printing defect

If you print a solid fill in cyan black or yellow is that line present as well? Or does it only happen in magenta
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gabiene Advisor
Advisor

Re: printing defect

Hi,

Your issue is from magenta drum cartridge as Joe indicaing in that table (44mm - imaging unit).

Switch the image units (drums) between them to see if the issue is mooving too.

 

Gabi

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Re: printing defect

The defect occurs in all colors.

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Re: printing defect

According to the chart, it should have been an imaging unit. I replaced all imaging units but the problem remains. Nothing changed.

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Re: printing defect

Yes, David. All colors.

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gabiene Advisor
Advisor

Re: printing defect

If is on all colors it is from IBT drive motor. Open the right cover of the machine an look inside at the gear of motor to see if one or more teeth of the gear are noy damaged.

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Technical Escalation User DavidX28897-xrx
Technical Escalation User

Re: printing defect

That defect could also be caused by
poor hvps
poor cleaning blade in every drum
Poor trim gap in every developer housing

My guess is hvps

Does it do this when you print an internal info sheet?(from ui)

You could panic stop the machine (while the 11x17 is starting to exit.) By opening L door. Remove the fuser with the paper still inside. Does the defect exist on the paper pre fuse?(probably)

Now spin the ibt belt (black belt below the fuser. Does the defect exist there?

If it does I would guess hvps
If it only happens after transfer to paper I would guess 2nd btr



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Re: printing defect

Hi Dave.

I did a panic stop while printing an 11x17 sheet and found that the defect was on the PRINTED sheet exiting the fuser but not on the unprinted sheet below the fuser. I could see the defect on the ibt belt below the fuser. I was not able to spin the ibt belt. 

I also checked the other side of the machine where the belt cleaner assembly is and spun that around. There was a lot of magenta on the belt reflecting where the paper stopped as well as a line like the defect I've been having.

Please tell me what "hvps" is. I'm not familiar with the acronyms.

Thank you, I appreciate your input as well as everyone else's!

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