Question about Canon PC-940 Black and White Copier

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White line and very, very dirty copies

Bought on Ebay and had this problem. Shook toner, still had problem. Ordered new toner, still having problem. White line through copy and nearly black copies.

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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.

Posted on Jul 22, 2008

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Sharp IR 2016 platine glass dirty


The cover plate is above the glass white surface of the scanner. If this is the same dirty stains will come out on copies.
The glass must be clean.
By feeding the original documents through the ADF, the scanner lamp is no longer the path to scan, the ADF is responsible for passing the original document over the scanner, while it remains still placed on the side under a thin glass is to a large glass side. This also must be clean, otherwise you will be black lines on each point or spot on the glass.
Good luck ...

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Very ''dirty'' copies, despite cleaning.Black lines and black smudges all over the copies. Copier (used) delivered to me 2 days ago, does toner need to settle perhaps?


I would guess you need a new toner cartridge. Improper toner distribution would not cause the problems you are describing.

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Was the toner remanufactured/ compatible?
Sounds to me like the doctor blade in the cartridge is 'gummed' up and not allowing the toner to flow evenly across the Developer roller......try another cartridge

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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.

Feb 17, 2009 | Canon PC-940 Black and White Copier

2 Answers

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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

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The MFC-7420 Manual recommends cleaning the scanner glass and white plastic bar above it with isopropyl alcohol. Page 11-22 has a diagram.

I am having a similar problem but cleaning it did not work. But try that first.

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1 Answer

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How is the copy quality? Are copies light? If so then the toner hopper is not adding toner to the developer assembly in which case you must call a tech. If the copies are fine then the toner sensor is dirty or faulty and must be replaced.

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DELL 1600N


If it makes verticle lines only when using the document feeder it is most likely a dirty glass strip over the scanner light bar. If it makes verticle lines in all modes (printing, flat bed scanning/copying, receiving faxes) it could be the fuser or a dirty glass over the laser where ever the laser images to a drum roller (usually a larger green roller). It is possible that this green drum roller is inside the toner - if so - replacing the toner cartridge could fix it. Maybe you could try an old used toner to see of the problem changes - if so - it is very likely that a new toner would fix your print quality issue.

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Blank trace appears on printed copy


replace the toner cartridge, this is a case of low toner.

NOTE: you should never clean the drum on the toner cartridge it is sensitive to light and touch.

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1 Answer

Printed pages look dirty


That black dust that fell out is the toner. When you shake a toner cartridge that shouldn't happen. It looks like you have a faulty toner cartidge and that need to be replaced! Now to make your printer prints cleanly and clearly after you replace the cartridge, you'll need to get someone to service the printer(the faulty toner cartridge more than likely spilled toner on your internal printer parts, cause the smudges). Sevicing would mainly entail, taking down the printer and removing any spilt toner! If you feel you are up to this, be cautious, because toner can be hazardous to your health if you accidentally breathe it in! hope this was helpful! regards babb

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