I cannot find new toner cartridge for panasonic kx mb 3020 where im residing, what is the close option please

SOURCE: Keep Adding Toner to Panasonic KX-FL511

Does this also fix the "change drum" message even after the drum is replaced?

SOURCE: I have an hp kx-fl511 fax machine. Has new toner

Hi!

Try to reset advanced features to their default settings
RESET=NO [±]
To reset the advanced features:
1. Press {MENU}.
2. Press {#}, then {8}{0}.
3. Press {A} or {B} repeatedly to select “YES”.
4. Press {SET}.
5. Press {SET} again.
6. Press {MENU}.

Thanks
Rylee

SOURCE: panasonic kx-fl511 has blank vertical lines on fax when printing.

It's important to gently move the toner cartridge from side to side to distribute the toner evenly through the cartridge. This could be causing your blank lines. Also, clean the Corona wire when installing a new toner cartridge. Best of luck.
Greg

SOURCE: Printer wants toner cartridge replaced, though not empty

unfortunately the drum within the cartridge has reached end of life so changing to a new drum cartridge would resolve this issue.

SOURCE: how can resolve call service 3 problem in panasonic kx mb 1900 printer

i have one panasonic KX-MB1900 all in one printer problum showing call service 3