Is there a fix for the Panasonic fax 7200 for no cartridge u16 message

Machine is in obvious need of repair.

There is a fix for this. But only a Panasonic tech has access to the parts for the fix. The toner sensor underneath must be moved closer to the cartridge, you are not low on toner.

I replaced already new toner cartridge for my brother fax machine mfc-2820 but still the on screen message is appearing on the display "TONER LIFE END".
Pls help me to solve this problem.

replace your cartridges with new ones or refill old cartridges if you have any
check here how

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If a new toner cartridge doesn't take care of it, replace the fuser.

Did you replace the Developer unit?
I beleive the Developer unit is not installed properly

It could be a refilled Kyocera KM-F650 cartridge in a Panasonic UG-5510 box.

They look identical, but are configured differently.

You need to try another cartridge as it appears it is not a machine problem.

probably you did not fix properly the ink cartridge.check the cartridge for proper seating.

The cartridge is probably not seating correctly in the machine. These cartridges are made with a plastic flashing on the drum shield that mates with a sensor actuator in the machine. Problem is, Panasonic made the same machine with sensor actuators in slightly different places for machines made in different parts of the world. This is so you couldn't use cartridges made in different places or for similar print engines such as HP or Lexmark, which are cheaper. You will have to fiddle with this so that the actuator is tripped, I usually remove the drum guard complete with springs and defeat the actuator with a rolled up ball of paper.

The cover may not be prperly closed. Is it difficult to close? Sometimes the cartridge may not be inserted correctly so that the cover won't close properly.