Brother MFC-J4420DW Power supply replacement

Disconnect the power cord of the printer

Open the printer as you would to access the USB port.

Pull out the rear end of the hood holder (see picture two). After that you can remove the top part of the hood holder.

Now remove the hood holder completely.

Next remove the cover on the left side of the printer (lift the right side of the cover first).

Unplug the black ribbon cable, the blue and the white plugs from its sockets and unscrew the cable which is attached with a screw (see second image)

Remove the red and white plugs from its sockets as shown in picture three.

Flip the plastic part shown in picture one up to the top part of the printer

Now you can easily remove the top of the printer by pushing it away from the printer (not up).

Remove the screws connecting the black plastic cover to the printer (see image)

Remove the cover

Remove the connector with the many red cables. (Already removed in the picture. The other plugs do not need to be removed.)

There are two screws that need to be removed.

Release the clip so that the power supply unit can be removed downwards.

This is what the power supply looks like.

It is labeled B57U152-2 LF1