The Wife came up with error 5a when trying to print on our Brother mfc- 665cw today. This can be a critical problem but not necessarily so. Try these things before you take it for service:1. Check for any paper jams:
Since the issue is usually a sensor issue a bad jam can mess up the lens, make sure it is clear.
2. Clear the print queue:
You should always clear the print queue when you have any kind of issue to make sure any tests are done in a clean environment.
3. Power down the machine:
Unplug and replug the device. Give it 10 seconds in between.
This might do the trick and save you a few bucks. Give it a shot first and see what happens.
