Brother Printer MFC-L3770CDW

[MJ Sipes]

We love the Brother MFC-L3770CDW multifunction printer, in fact we have 7 of them at work.  One of them has a continuing error that either asks for drum replacement or corona wire cleaning.  Even if corona wire is cleaned, the error will not clear.  The drum units are only about 30% used.  I have found the solution to be some combination of pulling out and placing back the toner/drum units to insure good electrical point contact.  All contact points have been cleaned as well.  If that method does not work, I manipulate the fins hanging down under the cover.  Some combination of this work will typically cause the printer to clear error message and start printing again.  When it first occurred a short time after warranty expired the certified Brother repair technician was told to replace the power unit to provide proper power supply to the drum units.  It happen again within the month.  No front line Brother online technician has a clue how to address the issue.  Has any one else ever experienced this phenomenon and know of a fix?  I don't want to replace the drum units yet but that may be an answer. 

[shockersh]

So, I don't have this printer but, I did a few searches and here's what I found:

Various Guides including a few replacement guildes like Drum Replacement, Belt Unit Replacement etc:

https://support.brother.com/g/b/manualtop.aspx?c=us&lang=en&prod=mfcl3770cdw_us_eu_as

Also, here is the service manual:

https://www.laserexpressinc.com/manuals/Brother/brother-dcp-9030cdn-l3510cdw-l3517cdw-l3550cdw-l3551cdw-hl-l3290cdw-mfc-9150cdn-9350cdw-l3710cw-l3730cdn-l3735cdn-l3745cdw-l3750cdw-l3770cdw-service-manual.pdf

Just in case that gets taken down (the link), I also attached the PDF file to this comment. Hope this help yous @MJ Sipes.

brother-dcp-9030cdn-l3510cdw-l3517cdw-l3550cdw-l3551cdw-hl-l3290cdw-mfc-9150cdn-9350cdw-l3710cw-l3730cdn-l3735cdn-l3745cdw-l3750cdw-l3770cdw-service-manual.pdf

[MJ Sipes]

Thank you for the information, especially the service manual that I have saved.

[Steve Krause]

I've got the same printer @MJ Sipes, love it. And yeah, thnx for the service manual for the MFC-L3770CDW  @shockersh. Handy to have that uploaded here since ya never know when it might vanish...

 

[DIYwood]

@shockersh Where can you find the service manual? Just bought the L3765CDW with only a touch screen and I want to be able to reset the toner when it "thinks" its out.  I have an old bw brother that I can use the manual push buttons to navigate the menu. Hoping to find a solution so I'm not wasting toner, it's not cheap and for now I'm just buying the brand name (though generic has been great in my old brother...but I waited several years before making the switch and plan to do the same again.) I've searched brothers site but it only gives me the user manual...which of course says to call service if you have "problems".

[Steve Krause]

@DIYwoodthe service manuals are not easy to find. I managed to find a copy online after a LOT of searching and digging. Here ya go:

hll3290cdw.pdf

Perhaps there are some details in here to help ya out. Just be careful. Performing many of these maintenance functions are for skilled service techs.