Hi Ron, I dont think you have a printer problem, i think you have a print driver/computer problem.
To find out unplug it (the usb) from you computer, turn it off so no data remains from previous print commands sent from your pc and run a self test by holding your green go button when you turn it on, keep it held untill toner, drum and paper lights light up, then let it go, then press the go button and the printer will print a self test....
If this works ok then we know your printer is ok. and your issue is as i suspect it is, with your print driver, paper size or tray select settings in Driver or in Word or in Excel or your document.
You can isolate if document problem by doing self test in print driver in control panel..
If self test on printer unpluged works and we have no error lights and are seeing the test ok and no flashing lights then you may want to ensure driver is good by completly unistaling the driver on your pc, do this by unistalling all brother stuff from control panel/programs and features (depends on operation system you are using).
Then with it still not connected, go to brothers web and download the full software and drivers package to suit your operating system, run it and only plug in the usb when instructed.
Let me know if your printer shows an error when not connected or if self test fails and Ill go down that road with you... if paper light on it when not connected, it tells us we have a jam, make sure you check back door and under toner drum and paper is sitting neat in tray
But when you tell me excel works and word doesnt, i dont think printer, it is software.Check your page size settings in word and excel and of your documents as the flashing paper light may be the printer trying to tell you the data sent to it from word is a paper size mis match to what the printer has in its tray and it wants you to feed the correct size paper in the manual feed/bypass slot. You should also check paper size and tray selection in your print driver in printers and faxs under control panel is the same as your document. Here
is your manual
and here is where you can download your print driver
(unistall old software and unpug usb first)
The more i ponder this, it is page size settings in document/excell/word and printer is asking you to feed paper in manual pass slot (above tray)