Question about Canon PC-940 Black and White Copier

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PC 940 Canon Copier help with cleaning

Changed toner and drum and copies are not great. The copies have 3 white lines going across the page about every 3" or so. Can someone tell me what to clean or look for. Thanks

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Hello sir; Discharge corona unit dirty it cause this problem, got to be discharge corona wire covered by tone, clean outby rubbing alcohol,it will take care your problem.

Posted on Feb 17, 2009

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1 Answer

Thin vertical line on copies


Tara, if the ink levels are ok, try clean and allignment functions from the tool menu. Use CLEAN UNUSED PAPER.

Mar 24, 2014 | Canon PC-940 Black and White Copier

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Mysterious fluctuation in quality of copies.


fuser drum is bad. photocopier use electricity to transfer the toner to the paper, then it is heat fused to paper. it appears that the problem is occurring around the time that the toner is attracted to the paper.

Mar 07, 2014 | Canon PC-940 Black and White Copier

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I have a Canon PC 940. The copies are coming out with black lines ( 1/2 inch wide ) on the sides of the paper. Do I need to get the copier cleaned? Thank you.


Could be optics needing to be cleaned. First I would rule out the toner cartridge. If you have a spare swap it out or remove your current cartridge, turn it over and slide open the "gate" that covers the drum cyclinder. The drum should be clean all the way across it's surface. If you see toner on each end then that is where your dark sides are coming from. If the drum is clean then most likely you have dust building up on the optics mirrors. One test for this is to manually lighten the exposure control on the operation panel and then recheck your copy quality. This may cause the rest of the copy to be light but if the dark sides goes away then your optics are dirty.
Good Luck and Thank You for using Fixya.

Aug 11, 2010 | Canon PC-940 Black and White Copier

1 Answer

We are getting spots of toner on our copies.


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

May 25, 2010 | Canon PC-940 Black and White Copier

1 Answer

Copies are coming out with a faded or blank patch in the centre of the page


Check the toner cart and the drum is it old/new is the toner cart properly installed. Is the LASER glass clean it should be protect by a cover ensure machine is off when checking and cleaning the LASER **** glass. Also check if you can print out a machine developed document such toner/pages printed document to see if this problem is related to the scanner or the drum/toner/LASER, if these document print out clan then the problem is with the scanner

Aug 09, 2009 | Canon PC-940 Black and White Copier

2 Answers

Dirty Copies and Black Line in Middle


the electrostatic drum probubly whent out if it was a cheap copier get a new one if it was expensive have it serviced or replace the drum yourself

Jan 22, 2009 | Canon PC-940 Black and White Copier

1 Answer

White line and very, very dirty copies


the nealy black copies sounds like the drum is going, try adjusting the exposure to light, if it comes out with the whole page the same way but just lighter than change drum. White line sounds like there is something on the coronas.

Jul 22, 2008 | Canon PC-940 Black and White Copier

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Canon PC-940 Copier


There are no fiber optics in the copier. It has 6 mirrors that send the image to the drum unit. Did you try to clean the copyboard glass? Also, do the marks move up and down the page? Also, have you replaced the drum cartridge recently? Pull the drum unit out can you see track marks on the drum it self. If not I would have to say it may be comming from the fixing ass'y, the hot part of the copier. Try to use a dry rag and wipe up any loose toner in the paper path then try to run some blank pages in the copier this may clear up the problem...

Mar 04, 2008 | Canon PC-940 Black and White Copier

1 Answer

Canon PC940 Problem


You could have a broken exposure lamp. Does the scan bar light up when you make a copy? If not that is the problem. You might also ck the contacts on the machine where they touch the toner cartridge. The toner cartridge opens a shutter to the drum when you slid it into the machine and that may be broken.

Feb 11, 2008 | Canon PC-940 Black and White Copier

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