Hi daac20,
The 5100 error indicates that the ink cartridge holder cannot move to the expected position. This can be caused by jammed paper, the ink cartridges not being seated properly, original packing material inside the printer or a hardware malfunction. It can also be caused by a smudge on the encoder.
Please check the inside of your printer for jammed paper or ofreign objects, then clean the encoder.
To clean the encoder, please follow the steps provided on this page:
Cleaning the Encoder Film - TR4520 / TR4522
If the 5100 error persists, your PIXMA TR4520 would require service. If your PIXMA TR4520 was purchased less than a year ago, please contact one of Canon's Technical Support Representatives via phone or chat to obtain your in warranty options. To contact a Technical Support Representative, please use the link below to log into your My Canon account:
https://mycanon.usa.canon.com
Once logged in, click on your PIXMA TR4520 and then click on the Product Support button. When that page loads, click on either the Phone Support button or the Chat Support button to access support.
If your PIXMA TR4520 is out of warranty, you are eligible for Canon's Upgrade Program. This is for out of warranty units which have been diagnosed to require service, or for some reason are incompatible with a new or upgraded system. This option allows you a one-time opportunity to purchase a replacement product, discounted from the list price.
If you would like to take part in this option, please call our Sales Department at (866) 443-8002 Monday through Saturday, 9am to 9pm. Let them know you have been working with technical support and the Canon Upgrade Program was offered.
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