Question about Canon FAX-B840 Plain Paper Bubblejet

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Canon fax-B840 - Print is "stripey"

Despite changing the ink cartridge & doing many cleans the print is still unreadable with the bottom half of all characters missing and pictures being "striped" - print a line, miss a line etc.

Is this the end of my Canon Fax B840?

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  • 318 Answers

No not yet,the problem is the cartridge,sometimes even new cartridges might have a dry printhead
Remove you cartridge,put the printhead side in about 5mm of hot water and keep it there for 5 minutes,take it out and do head cleanning again.

Posted on Mar 12, 2009

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Posted on Jan 02, 2017

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1 Answer

Dirty print on printed or incoming fax


Hello,

I think is a cartridge problem, try to change it.
It's possible the drum to be worn. For a precise response, i need a picture with an printed page.

All the best !

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Why when the fax machine prints is some of the ink lighter than the rest?


It sounds like the print head(s) is clogged and needs cleaning. Another potential problem is the wrong ink or a defective cartridge. They ARE different. If you refill the cartridges be sure the ink is compatible with the printer.
Often simply running the built in 'head cleaning' test will clear out the partial clog.


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If the print head cleaning maintenance routine does not clear the blockages, then print head needs replacing, but it may be expensive.
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Cannon b840,ink cartridege seems half full ,but fax comes through ist page perfect 2nd fuzzy,blank on all following pages


Sounds like the cartridge is empty. Your cartridge has a waste toner hopper that collects excess toner from being deposited on the page. The half full feeling might just be the weight of the waste toner.

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1 Answer

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1 Answer

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2 Answers

No ink


hi i am a certified Canon repair tech for this fax. the problem that you are having is very common and has to do with two things. the cartridge and the purge/cleaning unit. what you can try is this open the printer and center the carridge unit and remove the cartridge. unplug the machine while it is still centered. on the right hand side you will see the purge unit. in the center of the purge unit is what looks like a retanglar pad. mix a water soap solution and apply to pad just soaking it. let it sit for a few minutes. take the ink cartridge and wipe the bottom of the cartridge with a damp soapy cloth. also if you look at the cartridge there is a little breating hole you can hold a cloth on the bottom and gently blow in that hole it will purge ink through the bottom of the cartridge. install the cartridge in the machine close the front door and replug in the power cord. you might still have to run a few cleaning cycles. hope this helps.

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1 Answer

Won't print in black


open your list of printers. r/click on the 780 and open properties. fo to the last tab "maintenance" and run cleaning 2 or 3 times then run deep cleaning 2 or 3 times. and see how this helps. If you've never done it before you might want to take out the print head and clean it with alcohol. Take out all the ink like you were changing them then reach in and gently pull out the container that holds the ink. This is the print head. Clean it and replace it, then run clean and deep clean again. run Nozzle check to see how clean it's become and you'll definetly see a difference in your printing. good luck

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