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Freddy M.
Freddy M., Technician
Category: Printers
Satisfied Customers: 18398
Experience:  Years of experience
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MX850 paper jam on unattended multiple print job. Jammed paper

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MX850 paper jam on unattended multiple print job. Jammed paper sodden in ink. Jam cleared but prints (B&W) marred by white transverse stripes even after many repeat runs
Hello my name is***** look forward to assisting and am very sorry to hear that you are having this problem. I want to warn you that it is possible you will need to replace a part in order to fix this. There are a few different things that can cause this and a couple different parts so we would need to troubleshoot to find out for sure. Please send a blank page through and let me know what happens.
Customer: replied 2 years ago.

After the first nozzle clean a message said one colour ink needs. After 2nd nozzle clean it said 2 needed replacing and now it says 3 need replacing,

Under the inks I found another piece of sodden paper. When I tried replacing an ink, the replacement did not fit in the slot but sat about 1/4in low.

Let's try doing a manual cleaning of the machine and see if that helps at all.
If you have any trouble or get stuck at any point please let me know so I can help you.

Remove all the ink cartridges from the machine.
Then clean the contacts on the cartridges as well as inside the machine itself.
Do this with a small amount of warm water on a cotton swab until no ink comes off on the swab.
If any of the other cartridges are low, empty, leaking or bulging replace them.

Now once you have done all of that turn off the machine and unplug it for 70 seconds
Plug it back it and wait for the insert cartridges message
Insert the cartridges and check to see if the problem is still there.

If this did not work please come back and let me know by clicking on reply to expert so we can continue.
If it did work please don’t forget to leave a positive rating it is greatly appreciated.

Customer: replied 2 years ago.

I will try this

Ok. There is an area on the ink that will have ink come out when pushed on that is normal just get any dried ink off that area.
Customer: replied 2 years ago.

I find I don't have a replacement for one of the inks so will get that tomorrow I hope and try your suggestions then. Please keep my option to reply open. Thanks

For now please use the same ones, in case you end up needing a part unless they are completely empty I would not buy new ones yet.
Customer: replied 2 years ago.

Here's where I am now. Cleaned machine as directed. All single tank inks registered empty and replaced (don't understand why - they were all OK at the beginning). Copy of a blank sheet came out completely clean - pure white. Nozzle check print seemed OK except for white stripe about 2/3 way down PGBK check pattern. Copy of page of text came out with white horizontal stripes about 2mm wide at intervals of about 20mm.

Ok next we will want to remove the print head and do a manual deep cleaning.
This video explains how to do that: Click Here You can dry it with a lint free cloth instead of waiting, do not use paper towels as lint can clog the nozzles.

If this did not work, please come back and let me know what happened when you tried it by clicking on reply to expert so we can continue.
If it did work, please don’t forget to leave a positive rating - it is greatly appreciated.
Customer: replied 2 years ago.

Washed the print head under a tap as shown in the first video and left it to dry overnight (the ink tanks were also out in the air overnight). It has now copied a black and white text and a grey chart perfectly. Its first nozzle check prints produced flawless PGBK grids but striped colour bands (on the nozzle checks before the washing there was a white stripe through the PGBK grid but the colour bands appeared perfect). The latest nozzle check is much improved, but a white stripe through one of the colours. Do you think it will sort itself out in time, with a bit more use?

Sometimes after a deep cleaning like this some water will get stuck in the nozzles and cause what you are describing. To fix that run one of the built in cleanings once on the printer itself. If you already did that/the same thing happened it would unfortunately mean to fix it the print head needs to be replaced. If you have any questions at all click on reply to expert and let me know. If not please don’t forget to leave a positive rating for my help - it is greatly appreciated. Please note you are rating me only not this site or your Canon.
Freddy M. and other Printers Specialists are ready to help you
Customer: replied 2 years ago.

I have done a built-in cleaning. There is still a thin whitish stripe though the second cyan band but it is faint. It was not there before the deep cleaning and I am assuming it will eventually clear itself. Thanks for your help. I will send a rating