Question about Canon i 550 InkJet Printer

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Printer won't print

The message states the paper thickness lever is the cause.
What and where is the paper thickness lever, and how can I correct it?

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Re: Printer won't print

Hi Printer won't print but the paper come out

Posted on Sep 23, 2008

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Canon i550 yelow light on: "operator error" . Have tried to resume and delete printing tasks and restarted printer

Had the same problem with my I550. Was going to buy a new printer (I4000) since I could get one for about $30 more than the price of a new print head. I like canon printers with the individual ink tanks and have had no problems with the I550 for about three years.

Decided to try moving the paper thickness lever back an forth a number of times since some of the error messages indicated it could not determine the setting of the paper thickness lever. I don't know how the printer determines this switch setting but I thought if some contacts are slightly oxidized that movement might break up some of the oxidation. After operating the lever about a dozen times the printer started working. Hope this will help.

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Will not print and keep getting paper thickness error

Did you try moving the paper thickness lever (blue lever on top of the print cartridge holder)? It should be all the way to the left when you start--if it needs to be adjusted the printer message will let you know.

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Ink smudge on envelope

The paper thickness lever is not on the is on the floor of the "paper output tray" chamber. It is hard to see without directed light.

Refer to Loading Paper section of the Quick Start Guide....p 15 2 Prepare to load paper
(4) Adjust Paper Thickness Lever
(See diagram)

Or look at the "User's Guide on-screen manual" as directed by the Note on p. 17

I really had to search to find this lever while attempting to resolve my problem with a badly aligned printing head. I am going to have to buy a new printer. It definitely won't be a Canon due to the rip off cost of print cartridges.

Hope this is helpful.


Nov 14, 2008 | Canon PIXMA MX310 All-In-One Printer

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check the paper thickness lever located at the left side of the printer, set this lever to the lowest possible setting that your paper can handle. This is the darkest that the printer can print. Other than this, it may be an application issue. Check for contrast settings in your program.

Jun 24, 2008 | Printers & Copiers

3 Answers

Printer won't print

I know that the paper lever is where your paper is loaded. Check the grey plastic tab and try to drag it to the right or left. Depending on your paper size you might have to check the owners manual.

Mar 03, 2008 | Canon BubbleJet i560 InkJet Printer

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Paper thickness lever postion

Is there a lever inside the printer that can be moved back and forth? If so set it about half way and try again.

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Failed to print

At the head you said 'paper thickness position'and then you seems to have ignored that and did all the other things. Is there an adjustment for paper thickness, a lever perhaps. It does seem to be with the paper feed or paper presence detection. Take a look around, is there something stuck in the paper feed track? Can you have pass a piece of paper through without it rucking up? Do these things see what happens Take a look also at

May 26, 2007 | Canon BubbleJet i550 InkJet Printer

1 Answer

Paper jam

OK, first try resetting th printer. This sometimes works the first time and corrects a lot of issues. Switch it off, take out all paper, check for jams with a torch right down back and open cover and check ther too. Once you are sure there are no paper jams (look really carefully they can be tiny!) unplug all cords and cables. Plug all back in turn it on, and try printing again. Post back if no luck and i will further assist.

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