Sounds like your printing coverage is more than 5%.
A full page of 10 point text text uses 3 times the estimated
coverage produced by the 5% standard. If you are printing with larger font
sizes and any graphics the page yield drops even further.
Possibly you could have a low toner sensor error, as 1200 pages does sound a
little low.
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"Steve" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> I have a Brother HL1440. On March 24, I replaced the toner cartridge
> with a TN460, which is supposed to yield 6,000 pages. The printer is
> now flashing a low-toner warning. I average less than 10 pages per
> day, no graphics, just plain text. Have other folks had their Brother
> toner cartridges run out so soon?
>