Defective laser printer issues.

Hard to tell exactly from the screen shot, but defective / worn out fuser is the likely suspect here.

Before making any assumptions, did you try another toner cartridge? If you did and you get the same results, then I would then lean towards a defective fuser, especially since it looks to me like a double image, which would be the roller in the fuser.

Also, at no cost, did you try self-cleaning process? On HP printers this involves printing a cleaning sheet then running it back through the printer using maintenance self-clean.

it could be a fuser or the transfer roller.  The way to tell is to stop a page mid stream.  If the issue appears over the whole part of the page with ink, then it's likely the transfer roller.

If the issue only appear on top portion (that reached the fuser), then it's likely the fuser.  
 Not knowing which model, it could also be a drum.   I assume you have already replaced toner and hopefully drum.  Those are the usual suspects.

There appears to be a physical crinkle along the length of the page which makes me suspect fuser

Yes I agree about the user

At one time in my career, we used to repair fusers. There was a kit that you could have purchased that was used to dismantle the fuser and replace some components, including the fuser.

Over time and with staff reductions, we calculated that by doing the repair ourselves, in the long run, was actually "costing" us more, so we finally stopped doing this and just went back to purchasing the maintenance kits.

A fuser kit goes between $130 and $160 with install labor about $150 on site.
So about $280 for a repair.
A new Brother laser with warranty is about $349.

You have to decide between overall printer value to you vs cost of repair

A failed fuser tube would result in a standard page with toner that comes off when touched with a finger.  If the toner is firmly attached the problem's not a failed fuser tube, though there may certainly be other problems in the area of the fuser.

The grayish aspect with toner bits still scattered around suggests to me that the high voltage reversal is not complete.  But a better picture, or pictures, would help with diagnosis as the picture in the original posting lacks detail and is only part of a page.   There appears to be wrinkling and incomplete transfer of toner.  Better pictures, please.

You're right, the deformed pattern repeats itself 4 times down the length of the page.

Actually along with better photos, a model number would be helpful too.  We are all guessing about possibilities without nearly enough information.  Pics of one or two full pages, preferably printer configuration sheets (printer menu >> reports > configuration).

If the pattern repeats 4 times down the page, the fuser is a possible suspect. However, that would make the fuser diameter only about 2 cm. Not impossible, but there are other rollers in the printer with that kind of diameter.

If your printer has a "repeating defects" list, that will tell you which roller is the culprit. If you tell us what model it is, someone may be able to find a list for your printer.

If at all possible, always use scans, not photos. If you do need to use a camera, make sure that the sides of the paper show parallel on the photo. To achieve that, hold the camera parallel to the paper, with the lens vertically above the centre of the page. And make sure the entire sheet is visible, and that the paper is flat, not rolled up as in your photo.

Brother mfc 9130.

That's a colour printer. If the fuser is the problem, you will see the streaks in all colours. Is that happening, or does the problem only occur with black?

The Service Manual shows several examples of repeating defects, on page 127. Have a look and see which of the defects is yours. One possibility is a drum (page 134). The User Manual, on page 151 shows that drum defects are spaced at 94 mm (3.7"). Check that your problem repeats at that distance. As there are 4 drums in your printer, the colour of the problem will tell you which one it is.

Actually not any color as the paper itself shows impressions dug into its surface..

Defective rollers as noted above or other mechanical part and still possibly need a fused replacement probably means time to replace it

Not any colour

Black is also a colour.

What kind of paper is this? Have you tried different papers? By "impressions", do you mean "indentations"?

I think we really need some good sample prints. See if you can run off the printer's internal test pages. Then scan them and post.

Sorry, that table doubled up on me.  But you can measure down the page between the recurring defects, then match it the MFC 9130 periodic table I provided above.

i Always start by cleaning out the printer first from dust; cleaning the rollers also may help

I sent in the pict to Brother and here is their how to troubleshoot the issue.

https://help.brother-usa.com/app/answers/detail/a_id/70169/track/AvP0wgr7Dv8S~eEPGpQe~yL3SbUqkC75Mv~z~zj~PP86

Pretty much pointing to fuser.

Yes that my (our) thinking

Tell Brother what model your printer is - the one they talk about is not yours!

Any answers yet to my questions? And scans of the service pages - use your printer to scan them.

the printer itself may be set to duplex, but word may be overwriting the settings.

check your printer settings from within word and compare those settings (printer properties/preferences) with what the actual settings are outside of the application.

thanks for the input