How to Reset Ink Level Cartridges PG 40 and CL 41 in Canon Pixma iP 1880

When refilling ink of cartridge PG-40 and CL-41 at Canon Printer Pixma iP 1880, ink level at cartridge do not become automatic full, but we have to do reset manual otherwise you change new PG-40 and CL-41 cartridges, you needn’t reset the cartridges.

There are some ways to reset of type Canon printers cartridge PG-40 and CL-41, one of the way to reset ink level cartridges PG-40 and CL-41, shall be as follows. Before you do reset you have to provide one of Canon Printers Cartridge PG-40 and CL-41 again.

Resetting level ink :

1. Tide of Cartridge Canon PG-40 and CL-41 (2nd) to Canon Printer Pixma iP1880 and let the cartridge detect untill finish. And try to test print.
2. After refill of cartidge canon PG-40 and CL-41 (1st), tide the cartidge PG-40 and CL-41 (1st) at printer and try test print again, usually the ink level status have full again. Otherwise succeed to try again.
   

Note :
Let easierly of first Canon Cartridges PG-40 and CL-41 i give the name (1st), and other Canon Cartidges PG-40 and CL-41 I give name (2nd).

fix for TN250 cartridge in an MFC 6800

Anybody have a fix for TN250 cartridge in an MFC 6800.
Same problems with low toner light. Also out of toner caused shutdown. Managed to get it going again by cycling power on and off.
My problems have got worse after using after-market toner cartridges at ~$8 each but I can live with them (save $32 ).
Summary of my problems are
1 Toner shading intermittent. Sometimes gets worse as more copies are done. Sometimes starts bad and improves.
2 There is toner in cart and I would like to get low toner light off.
3 Occasional out of toner shutdown.

I have looked at the TN250, both brother and after-market, and see no window to cover!
Thanks for listening