Maxify MB5320 - paper cassette error; small gear fell out

[kaymar]

We are not able to print from our Maxify MB5320 due to an error we can't seem to clear. It's the same error all the time: the paper in the cassette doesn't match the size registered, or something to that effect. I've tried to change the paper size, but the changes I make are not being saved. (Maybe I am doing something wrong.) Perhaps related, but maybe just a coincidence: a small white gear rolled out of the printer when I removed a paper cassette (see photo). Can someone tell me what the gear is for, where it goes, how to reinstall it, and how to resolve the paper size mismatch problem that is preventing me from being able to print anything? Thanks for any help you're able to offer.

[Patrick]

Hi kaymar,

Your MAXIFY MB5320 would require service.  If your MAXIFY MB5320 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:

https://mycanon.usa.canon.com

If your MAXIFY MB5320 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.

To help you get up and running quickly, we also offer free standard shipping (if the order is completed by 12:30PM ET). If you would like to take part in this option, please call our Sales Department at (866) 443-8002 seven days a week, 8am to Midnight. Let them know you have been working with technical support and the Canon Upgrade Program was offered.