A Brother MFC-8840D reported an Error 6A on the panel after a short power-outage that occurred. Calling Brother indicated that the error reflects that.
To clear the error, the procedure is as follows:
1. Turn off printer
2. Hold down MENU button on front panel and turn on power while continuing to hold.
3. Release button after 5 seconds (after the Please Wait message)
4. If error still occurs:
5. Press 91
6. If error still occurs:
7. Press 99
This should clear the error.