Had exactly this problem on a 3 year old MFC-J6920DW today - found a solution elsewhere on the net:
Remove power cord and wait 30 seconds. Then remove paper trays. Reconnect power cord and switch on at the wall. Wait for printer to boot (and complain about lack of trays). Reinstall paper trays.
All up and working now!
Had exactly this problem on a 3 year old MFC-J6920DW today - found a solution elsewhere on the net:
Remove power cord and wait 30 seconds. Then remove paper trays. Reconnect power cord and switch on at the wall. Wait for printer to boot (and complain about lack of trays). Reinstall paper trays.
All up and working now!
Had exactly this problem on a 3 year old MFC-J6920DW today - found a solution elsewhere on the net:
Remove power cord and wait 30 seconds. Then remove paper trays. Reconnect power cord and switch on at the wall. Wait for printer to boot (and complain about lack of trays). Reinstall paper trays.
All up and working now!