Brother MFC-8420 User Manual page 378

ERROR MESSAGES
ERROR CAUSE
MESSAGE
A page, piece of paper or paper clip, etc. may
Pls Open
be jammed inside the MFC.
Cover
Toner cartridge is not installed.
Toner Empty
—OR—
Toner is used up and printing is not possible.
If the LCD shows Toner Low, you can still
Toner Low
print.
But the toner is depleted and the MFC is
telling you that the toner will soon run out.
TROUBLESHOOTING AND ROUTINE MAINTENANCE 22 - 4
ACTION
Open the front cover. If you see any
jammed paper or other item, gently
pull it out, then close the front cover.
If the error message remains, open
and close the front cover again. If
the MFC cannot reset itself and
return to the date and time prompt, it
will display Machine Error XX.
Then contact your Brother dealer for
service.
Reinstall the toner cartridge.
—OR—
Replace the toner cartridge with a
new one. (See Replacing the toner
cartridge on page 22-27.)
Order a new toner cartridge now.