The LED Assembly LU5831001 is probably bad. This machine has 4 LED assemblies mounted in the top cover. It doesn't use a laser scanner.
To troubleshoot, you can clean them, then swap them between colors before you buy it.
thanks! Any idea how to change those? doesn't seem to want to come out easily
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SOURCE: brother intellifax 4100 prints full page all black
Good chance the High voltage power supply is bad. Not worth repairing. A new unit costs about 259.00.
I’m happy to help further over the phone at https://www.6ya.com/expert/jayw_0e86fb055a7b73de
SOURCE: black mark on right side of paper
You either have some white out or some other dirt on the scanner or some sections of the scanner are bad. Open the area where your originals feed into, and look for about a 1/2 inch wide strip of glass, that is the scanner window. When that gets dirty, or fails, that causes the problem. Most likley dirty, some whiteout or ink on the scan window.
SOURCE: Black line on faxes
Check carefully the glass, a very small point of ink or anything else can cause the black stripe. usually it is that the problem. use windex to clean it.
SOURCE: 1/8" wide black line down center of faxes; possible to eliminate?
you need to replace the fuser roller in the fuser.
SOURCE: Black strip 1.5 inches wide on right side of page
first, take drum unit out and make sure the blueish-purple colored plastic tab on top of drum is all the way to the left side. if thats not the culprit, then you are most likely looking at a bad contact image sensor or CIS.
hth,
ray
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