Question about Canon PC-940 Black and White Copier

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We are getting spots of toner on our copies.

We have cleaned the glass but we are still getting three spots of toner on our copies. What else can we do th eliminate the spots?

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Vacume the interior of copier, check the drum.If there is spots on drum, change the drum.
Also check the fixing section.

Posted on Jun 14, 2010

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Sounds like a fusing error . If your able to wipe the toner off the page its a fuser unit problem (replace fuser unit).

Also clean the copier's paper rollers. Marks on copies will occasionally be the result of a dirty paper-rolling mechanism. Simply access these rollers (your photocopier will likely have a plaque or series of signs indicating the locations of these areas) and wipe them off.

Clean the copier bed's glass plate. One of the most common causes of blemishes in photocopies is a dirty glass plate. In some cases a permanent mark, such as a scratch, will be present on the plate, showing up in every copy as a dark line or spot. However, most problems attributed to the glass plate can be fixed by wiping the plate with a soft towel and common household glass cleaner.

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Now if the white streak is very fine and the above procedure does not work then it is most likely something stuck to the scanner glass. To test for this print out a report from the operation panel or if you have the machine connected to a PC print something from there. Are your print outs ok? If so it means that it is definately something on the scanner glass. To locate it and clean it just make a copy of something. Now take that copy with the blank line on it and place it in the feeder just as you did with the original. now wherever the blank streak is lined up on the machine is where the spot is going to be on the scanner glass. Just open the cover where the documents go in and look for the strip of glass that runs from side to side. Your copy passes over this glass when it is scanned. Where the blank line hits this glass is where the trouble spot is. Just clean the glass with a cloth that has some glass cleaner sprayed on it. This should resolve the problem.
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Did you try to clean beneath the copy glass?
On digital machines, when the copy glass or optics are dirty, copy becomes verry light.

How many copies do you have? pres 123 button.
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But I bet on dirty copy glass and dirty scanner assy.Clean the glass with glass cleaner and polish it with dry cloth.

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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

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I am not to fimiliar with this model. But, somewhere around where the toner is put in, should be a **** of glass shielding the laser from the toner. Clean that glass, it may have a small cover with a screw in the cover. When the glass gets toner speck on it void spots in the copied/printed images.

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Clean the scanner glass. If you see any toner spills inside of the copier, you might want to clean those.

If you look at the green drum and see toner on it after copying, it could be the cleaning blade under neath the drum isn't working properly.

If you know where the charge wires are, you can clean those off as well.

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