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Brother MFC-J4420DW Power supply replacement

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If the Brother MFC-J4420DW printer does not turn on, the power supply may be defective.

Try the other options for resetting the printer first. For example, the steps in https://de.ifixit.com/Anleitung/Brother+...

These instructions do not provide information on how to repair the power supply, but how to remove it.

  1. Brother MFC-J4420DW Power supply replacement, Removing hood holder: crwdns2935265:01crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Brother MFC-J4420DW Power supply replacement, Removing hood holder: crwdns2935265:01crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Brother MFC-J4420DW Power supply replacement, Removing hood holder: crwdns2935265:01crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • 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.

    • It is quite useful to put the printer near something so that you can lean the top against something, for example a wall.

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  2. Brother MFC-J4420DW Power supply replacement, Removing cables connected to the top part of the printer: crwdns2935265:02crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Brother MFC-J4420DW Power supply replacement, Removing cables connected to the top part of the printer: crwdns2935265:02crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Brother MFC-J4420DW Power supply replacement, Removing cables connected to the top part of the printer: crwdns2935265:02crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • 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.

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  3. Brother MFC-J4420DW Power supply replacement, Remove the top part of the printer: crwdns2935265:03crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Brother MFC-J4420DW Power supply replacement, Remove the top part of the printer: crwdns2935265:03crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Brother MFC-J4420DW Power supply replacement, Remove the top part of the printer: crwdns2935265:03crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • 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).

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  6. Brother MFC-J4420DW Power supply replacement, Remove cover: crwdns2935265:04crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Brother MFC-J4420DW Power supply replacement, Remove cover: crwdns2935265:04crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

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

    • Remove the cover

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    • The following steps are based on the Brother Inkjet DCP/MFC Service Manual MODELS: DCP-J4120DW MFC-J4320DW/J4420DW MFC-J4520DW MFC-J4620DW/J4625DW. In particular, step 9.29 “Power Supply PCB ASSY”.

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  8. Brother MFC-J4420DW Power supply replacement, Disconnect the cable: crwdns2935265:06crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

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

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  9. Brother MFC-J4420DW Power supply replacement, Remove screws: crwdns2935265:07crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Brother MFC-J4420DW Power supply replacement, Remove screws: crwdns2935265:07crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • There are two screws that need to be removed.

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  10. Brother MFC-J4420DW Power supply replacement, Remove the power supply unit: crwdns2935265:08crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

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

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  11. Brother MFC-J4420DW Power supply replacement, Power supply: crwdns2935265:09crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • This is what the power supply looks like.

    • It is labeled B57U152-2 LF1

    • A possible starting point here is the soldered fuse F1. According to the circuit board, “250V T2.5AH”.

    • However, the fuse may only be a symptom and not the cause. See for example the article https://www.mikrocontroller.net/topic/50...

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Follow the steps in reverse order to reassemble your device.

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