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Re: Everytime we print there are dots down the left hand...
You may have a build up of toner on your photo conductor unit. With a soft dry cloth carefully wipe the Green tub after which is located behind your toner cartridge it is the photo conductor unit.
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Run a "half test".
Put paper in the manual feed tray.
Print anything. Watch the paper, when it feeds about 1/2 way into the printer, open the cover.
Pull out the toner and look down at the paper.
If it has the dots, replace the toner. If it doesn't have dots, the fuser is probably bad.
Measure the distance between two of the same coloured dots down the page, if it is just over 150mm then it is caused by scratches on the photoconductor drum (this is the only thing that has a 15.4mm circumference). Try printing a black and white only document, only the black dots should appear. Removing the photoconductor and gently polishing the blue drum with a soft cloth can help if the scratches are not too deep, otherwise a new photoconductor is the only route.
Have you tried cleaning the corona wire on the drum unit (the blue slider bit)?
Replace the drum unit (assuming you have already replaced the toner cart?)
To check the remaining drum life press the go button 3 times. A report should print out with the info on. Even though you may have some remaining life, the drum can fail early.
If the dots/marks are repeating about 3 times down the page it is almost certainly the drum unit that has the problem.
This is a workaround - I too need a definitive answer. Symptom: black dotted vertical line 1/2 to 3/4" from leftmost image edge. I have begun adding single vertical line to my prints .25" from the left edge of the paper to force the "dots" off my print - this seems to have the desired affect, but it does not answer the cause or provide a true remedy (it will save many of your prints while we wait for complete solution). dkh
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