It had just worked, I scanned couple things, then in the middle of a scan, it quit saying it could not connect to scanner.
Yet, the networked scanner must be visible on the network or it would not be selectable scanner to use.

The scanner - printer is connected to the router and test connectivity works.

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I tried to print to it and nothing, so somehow it lost its config in ubunut just like that...
under properties says address null??

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The printer is connected by wifi to the router.
I deleted the printer and redetected the printer using cups, the other add printer dialog in 'printers' in apps, always gives tons of printers mx490 series. At least cups only puts up one mx490 series printer in to the list.

So anyway, it detects and sets it up, but nothing can print! It used to work, then suddeny died during a scan and has not worked since.
here is a job failing, and then ubuntu popped up a warning after telling it to print a test page, it hung for a while then the warning.

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I decided to turn the printer off, then turn it on, and everything printed.
WHY did it need to be turned off in order to work?