I have black streaks on the on the paper. The streaks almost completely cover the pages. is there an area that needs cleaning or anything that needs replacing. I have a Brother Intellifax 3800.

Try to print clean page ,
Print a cleaning page During the printing process, paper, toner, and dust particles can accumulate inside the printer and can cause print quality issues such as toner specks or spatter, smears, streaks, lines or repeating marks. Follow these steps to clean the printer's paper path.

1. Load copier-grade paper (not bond, heavy, or rough paper).
2. On the printer's control panel, touch the Menu button.
3. Touch Configure Device .
4. Touch Print Quality .
5. Touch Process Cleaning Page .

A Cleaning message appears on the printer control panel display while the cleaning is taking place. The cleaning process takes a few minutes to complete. Do not turn the printer off until the cleaning process has finished. A page will be printed when the task is complete. Discard the page. You might need to repeat the cleaning process to thoroughly clean the printer. Print a few more pages to see if the problem is resolved.

Multiple lines appeared in every scan right after scanning a document from a credit card company that had those nasty adhesive strips used to attach credit cards.
First, I scanned multiple full pages to see if the problem would clear itself. After about 6 pages, I was able to identify the specific areas where the lines occurred on a document.
Next, I sprayed a tiny bit of glass cleaner (I used Sparkle glass cleaner, but I suspect any brand would work) onto an 8.5x11 sheet of plain paper in the area where the black lines appeared. NOTE: DO NOT SOAK THE PAPER, just get it damp.
Finally, I ran the dampened paper through the scanner. After each run, I would compare the result to the prior scan. As each streak was removed, I used a different piece of paper wetting only to address the remaining streaks.
After only a few runs, the streaks were gone (in my case).

Hope this helps!

If you have changed the drum then probably your fixing film was torn. Check if the black streaks on paper is erasable (not fixed on the paper). Check also for signs of film (gray on one side and brown on the other very thin plastic-like material) falling out from your fixing assembly (if you open the left side cover with caution sign the hot portion area).

Printer needs to be cleaned. Q-tips work well use acohol make sure printer is off and unplugged. Squeeze acohol out of Q-tip and wipe all areas of the bars, capstans(little wheels that pull the paper) Remove all black spots from the wheels. All bars should be cleaned in the same fashion. Let dry.
Do not drip liquid in printer. Make sure the Q-tip is just damp with alcohol.

If this started after cartridge was replaced, then it is probably defective.

Take the cartridge out and take a look at the print head. Clean the print head.
Put the cartridge back in
Try and feed paper (not printing anything on it, if you can not get it to just feed paper, print a blank page) and see if it still has lines. If so, you are probably going to have to clean ink from inside the paper feed area. If not, try using it for a while and if it starts again, get a replacement cartridge. You might want to save some of the bad prints to show the clerk and try to get the new cartridge under warranty.

SolutionFollow the given steps in the order presented to resolve the issue: Step one: Retry the print jobThe problem may occur only rarely. If you have not seen it in other printouts, try again. Step two: Increase the print quality modeIf reprinting did not help, try increasing the print quality mode.

1. In the application you are printing from, click File , and then click Print .
2. Make sure the printer is selected, and then click Properties .
3. Select the Paper/Quality tab.
4. In the Print Quality area, choose the next higher quality setting. If the current setting is Draft, choose Normal. If the current setting is Normal, choose Best.

Step three: Print in grayscale (black area streaking only) If the streaks are in a black area of a black and white printout, change to grayscale printing.
NOTE: This step does not apply to color printouts.

1. In the application you are printing from, click File , and then click Print .
2. Make sure the printer is selected and click Properties .
3. Click the Color tab, and select Print Grayscale and High Quality .

Step four: Clean the printheadsIf the print quality is still bad, clean the printheads.

1. Make sure the printer is loaded with unused white paper.
2. Open HP Solution Center .
3. Click Settings , Print Settings , and then select Printer Toolbox .
4. Click the Service Tab .
5. Click Clean Printhead , and then click Clean .

Step five: Align the printheads If the print quality is still bad, align the printheads.

1. Make sure the printer is loaded with unused white paper.
2. Open the printer Toolbox , and select the Printer Services tab.
3. Click Align Printheads . The Align Printheads window opens. Click Align .
4. The printer prints an alignment page. The lines in the patterns should appear to be straight. Click OK when the page finishes printing.

Step six: Calibrate the linefeed If the print quality is still bad, calibrate the linefeed:

1. Make sure the printer is loaded with unused white paper.
2. Open the printer Toolbox and select the Printer Services tab.
3. Click Calibrate Advanced Linefeed . The Advanced Linefeed Calibration window opens. Click OK .

Step seven: Replace one or both printheads If the print quality is still bad after performing all the above steps, one or both of the printheads will have to be replaced. Print a PQ Diagnostic page to see which printhead should be replaced.

1. Make sure the printer is loaded with unused white paper.
2. Press the Setup button.
3. Press 1 and * simultaneously.
4. Look at the color blocks labeled Test Pattern 2. Some or all of them could show white horizontal streaks. If none of the blocks are streaked, the printheads are okay.
   • If the Black block has lines – replace the KY printhead.
   • If the Cyan block has lines – replace the MC printhead.
   • If the Magenta block has lines – replace the MC printhead.
   • If the Red block has lines – replace the KY printhead.
   • If the Green block has lines – replace the KY printhead.

Had a similar problem. Tried lost of things. In my case, the streaks cleared up after I cleaned the toner drum.

Hi jepeto997:
Try these steps.
Check for and remove any media, jammed
paper, or debris found in the printers exit
path.
2. Did this correct the problem?
Complete. Go to Step 2.
2 1. Clean the maintenance kit wiper blade or
replace the maintenance kit.
2. Did this correct the problem?
Complete. Go to Step 3.
3 1. Check the exit area, exit frame, the
preheater, maintenance kit, and the
printhead (including the paper release blade)
to see if there is anything touching the drum
assembly.
2. Reseat any printer component interfering or
touching the drum assembly.
If there are streaks on the front side only of a
2-sided print, the preheater may be scraping
ink off the print.
2. Look for ink shavings along the streaks on
the printed paper.
3. Clean the preheater using the Control Panel
Remove Print Smears function.
4. Did this correct the problem?
Complete. Go to Step 5.
5 1. Possible weak or missing jet. Print the weak/
missing jet test print from the Control Panel,
see "Weak/Missing Jet" on page 5-33.
2. Did this correct the problem?
Complete. Go to Step 6.
6 1. Possible discolored jet. Print the solid fill test
print, see "Black, Red, Green, Blue, Cyan,
Magenta, and Yellow Solid Fills" on
page 5-40.
2. Did this correct the problem?
Complete. Go to Step 7.
7 1. The X-axis drive is not functioning correctly.
If the X-Axis Drive does not move the
printhead smoothly and evenly during
printing, vertical lines appear on the print.
For information about X-Axis Drive
problems, see "White Stripes (Pinstripes)"
on page 5-30.
2. Did this correct the problem?
Complete. Go to Step 8.
8 1. Smears on a duplex print can be caused by
the paper preheater operating at a
temperature that is too high or debris is in
the duplex roller or duplex paper path
guides.
2. Run the service diagnostics Duplex Path
test to check the paper preheater’s
temperature.
3. Is the operating temperature within the
correct value range?
the paper preheater operating at a
temperature that is too high or debris is in
the duplex roller or duplex paper path
guides.
2. Run the service diagnostics Duplex Path
test to check the paper preheater’s
temperature.
3. Is the operating temperature within the
correct value range?
Replace the
preheater.
Replace the
electronics
module
Hope this helps
3. Clean the paper release blade.
4. Did this correct the problem?

Check your office supply store for printer cleaning paper. It is a heavier weight paper that is sticky on both sides. Run it through several tines to get paper dust off the rollers and paper path.

go to page13-9 routine maintenance section, where it says to clean the glass strip on top of it there is a white plate (shown) does that plate have ANY dirt or spots etc......?
It MUST be completely WHITE or it will give you black streaks. if it cannot be cleaned then use white out to cover. ( makesure it is completely dry before using).