Question about Brother MFC 7420 All-In-One Laser Printer

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Transmission level How do i change the transmission level on the mfc7420? coming back says the level is to soft

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I have just received the following info from Brother Support:

To adjust the transmission level on your fax, please follow these instructions:

- Press the following buttons in quick succession: (MENU, *, 2,8,6,4) These must be pressed in under 3 seconds. If done correctly, the screen will display maintenance, but if it does not, press STOP and try again until it does.
- Once maintenance is on screen, press 1, then 0. The screen will display WSW00.
- Press 13, and the screen will display WSW13=01011110
- Press the right arrow on your control panel until the cursor is underneath the 3rd last digit, and press 0. Your screen should show: WSW13=01011010
- Press SET
- Press STOP
- Press 99 to exit maintenance mode, and once back to the time and date screen, send a single page fax to 1300 368 999 and you will receive a faxed reply that will show you your transmission level and how much it has been adjusted.

Please note if your transmission level is still not in an acceptable range ( -15dB to -18dB ) then it would be best to contact the Product Support Centre on the number listed below to discuss possible fixes.

I hope this helps.

Posted on Feb 19, 2008

  • dwaldron68 Apr 24, 2011

    I tried this today on my new Brother MFC-7440N and it corrected the transmission level problem just fine. The only thing that was different is you press OK instead of SET. Thanks for the post, it saved me a phone call!

  • John Hilvert May 01, 2013

    Definitely the way to go for Australian telco requirements. As well as replacing SET with OK, I found it best to just amend whatever WSW13 was showing with WSW13=01011010. That got me an excellent rating from Telstra.



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