Had toner life end message. Replaced toner and drum with oem,machine reset but now just making blank copies. Tried to print internal report that's blank too

The problem with this is the design. Each toner cartridge has a microchip on it, that counts the pages you print. The company has determined that you get x amounts of prints. Then you have to replace it, empty or not. This printers do not work the same way as an expensive professional business copier. In an pro style there is a spent toner cartridge that collects all of the wasted toner that is on the drum. On a small business/home style this spent toner goes back into the cartridge. There is no level indicator, even on the inkjet printer. They too, have a chip that says you have x amount of prints/cleaning cycles they can go through. Look up inkjet refill kits or inkjet cartridge programmer.

why toner life end message keep on showing on sp 1200s prints.

Brother International - Support for your Brother Product

Ninty-five percent of all image issues like this are caused by the carona-drum-toner assembly. I have not worked on this model but the only way to diagnose the issue is to try a new drum / toner cartridge and see what impact it has. Then once you resolve the issue you can discuss the service life after the fact.

Did you replace the waste (used) toner cartridge or the empty toner cartridge? These copiers have 2 "cartridges" .... one is waste (used) toner, the other is "new" toner for copying / printing etc. Some newer copiers have All in One units....Drum, New Toner, Waste (used) Toner. If you replaced the Waste Toner container (or dumped it) that should reset the code or error message.

1) you do not dump toner into the drum! Juo dump it into the toner unit.
2) didi you after replacement put the blue toner handle (right from toner unit) into the left position?

sounds like you are using generic drum and toner. try OEM (brother brand). you say copies are coming out completely gray. try printing an internal report from the control panel. if that is gray or received faxes are gray, then the problem is not in your scanner area, and i would wager you are using "generic" supplies.

hth,
razors

Open the door where the toner goes. Press the 'back' button. Press *00. Do not respond to the query about the drum. Close the door. Other models may have to press the 'Options' button located near 'Copy'. This should work.

I have a brother mfc 7840w

I first used the electrical tape trick and that worked for a while. Then got the toner low message again. I then tried the *00 trick, which works as follows:

1. lift lid and open front cover
2. press clear/back. "Replace Drum?" will appear on the screen.
3. Press "*00" it will then read accepted and the toner low error (End of Toner Life) should go away.
4. close it all up and your done.

Have you tried both drum and toner supplies? cause it sounds like a drum fault, if you have tried a new drum and toner, and it is doing it when printing internal reports, receiving fax's and copying then you have a tecnical issue to do with charge and this would likely render machine unecomical to repair (unless you can find a bad contact with drum on machine). If it receives faxs clearly but copys black then it is different issue (ie optics).