Ditto with the 5C20 error and symptoms. I have a cleaning sheet, but, I cannot get to the Menu to run the routine, because it goes directly to 5C20 and locks. Question: how can I invoke the Cleaning Sheet routine with the printer stuck on 5C20? Powering off/on does not work. Thanks in advance.

GO HERE:

Try here first:

Error 5C20 on my MX7600 canon printer Canon MX7600 Office All In One...

and here:

FIX Steps to Fix Canon Printer Error 5C20

This Canon Support page is grade D:

Canon Knowledge Base 5C20 error appears on MX892

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Dial 18002430019 Canon Printer 24/7 find here Canon Printer Customer Service number 24 hour and booming path to get instant technical support for technical problems.

Inkjet printers need to be used frequently to prevent inkdrying out in the print head nozzles.
If the print head cleaning maintenance routine does not clear the blockages,then print head needs replacing, but it may be expensive.
It may be more cost effective to buy a later model and better printer thanreplace the print head.

http://www.very-clever.com/information/xbddkhxaxnexmq

The above link indicates that an error 5c20 is something that may be difficult to deal with.

http://www.usa.canon.com/cusa/support/consumer/printers_multifunction/pixma_ip_series/pixma_ip4500#ServiceAndSupport

A search for 5c20 error at above link for your printer didn't turn anything up.

Yes, 5100 means the carriage is not moving back and forth properly or there is grease on the encoder strip behind the carriage assembly. Grease spots make it lose count and slam into the side and grind gears. You need to clean the strip with a Q-tip moist with alcohol, but very carefully, not too much pressure on the strip.

Unplug the printer from power cord.Press and hold the "menu" button, then plug the device.You'll see on the LCD screen a "machine error" code.If this code is 40,41,49 or 4F the print head is defective.If the
error is 50 or 51 there is error in Purge unit and printer require service.If the error is 48 - defective print head cable or circuit board.If the error is 46 the waste ink tank is full.Follow this:
1. Pres 'menu', 'mono start' then 'menu' one by one...
2. Press the arrow up or down to go to 'maintenance 80'.
3. Press 'mono start' several times to go to 'Purge'. Finding the PURGE will show some numeric value
which is Iassume the number of times the printer had cleaned.
4. Press 'arrow up' key and scroll for number "2" then press "set".Do the same for numbers 7, 8 and 3.
After you have entered this combination, the purge numeric value will be reset to 00000.
5.Restart printer

1.Try placing sheet of Magenta print on copy board, and run many copies .  Run head clean after about each 50 sheets. 

Pixma pro 9000
service error 5110 after paper jam.
BEST QUICKEST WAY TO FIX THE PROBLEM!!!!
DUST BLOWER ALL OVER THE AREA INSIDE
AND TURN IT BACK ON U SHOULD HAVE SOLID
GREEN LIGHT FOR SURE!!!!!!!!

DAMN I CAN'T BELIEVE I BROUGHT THIS SAME PROBLEM
TO SERVICE CENTER THE FIRST TIME!!!
NO MORE WORRIES!!!

Error message 5C20

You have a major error, probally head stuffed error 41, to find out your error press menu starte and up 4 times, this may show error if not then input 82 set, error will display.

Post back if need more info
S.