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It may be time to replace the drum. Check to see if the light spots are random or if they appear at regular intervals. Regular intervals would indicate something in the paper path, typically the drum. But don't rule out the fuser.
Are the ink spots in the same pattern down the page ?
if so it sounds like a bad drum. try and make a copy using only one color at a time, to try and tell which drum it may be. If the spot are random down the page it may be the ITB belt cleaner.
I don't know the model of Canon Copier you have, and I don't know if your problem happens when you copy and print, or only when you copy, so it's hard to tell with the little information you've provided.
Let's assume the easiest solution is the correct one...
Is the "Spot" in the same location on every copy? Then clean glass.
does the spot move left to right across the page with each successive copy? Then replace the drum unit.
If the spot appears in the same exact location, you should clean the copy glass but if the spots are in the random area at the same line you should check the drum seal of the drum unit. The seal purpose is to prevent the waste toner from spilling to the drum and copy paper
Are the dark spots random and moves location with every copy or are they at exacly the same place on every copy? Random you will need to remove the drum/toner and use a blower to clean the inside of the machine,failing that replace the drum unit.If the spots don't move clean the top glass.Let me know
unfortunately this is not a fix yourself problem.
1- seperation could be bad
2-bad toner or developer
3- could be as easy as cleaning the mirrors
try to find a tech that works on the side, or freelances for no more than $40-75 depending on the complexity.
There are lots of things that can cause this. Inspect the fuser assembly & verify that there isn't any teflon missing from the upper roller & that the lower roller is clean. The spots can also be caused by a build up of waste toner in the cleaning assembly, causing excess toner to be dropped on the copies as they pass under it. The cleaning assembly would need to be removed & cleaned to correct this. The spots are not always in the same place - but are they the same pattern? A worn drum assembly can cause spots that are usually a repeating pattern but located in different parts of multiple copies. Dirty corona wires can also cause random spots & rewiring the coronas would solve that.