We’ve learned that the Sharp printers that are able to AirPrint from iPhones and iPads have issues printing encrypted(password protected) PDF files. If you try to AirPrint an encrypted PDF, you’ll get an error with the machine’s model and serial number that says “The printer is paused.” To workaround this issue you’ll have to either get an non-encrypted copy of the file, or email that file to a computer and print it from there.
You’ll also notice that if you have user control enabled you might have issues using Apple AirPrint with your iPhone or iPad. In this case we recommend using the free Sharpdesk Mobile app. It has the capability to input the user codes so you can continue to use your iPhone or iPad to print to your post script enabled Sharp printer.