Changing the toner cartridge in an oki b4350

That is a temperature error with the fuser, most likely the thermistor. Really the fuser needs to be replaced. Hope this helps.

check for tape covering toner 'dispenser'. also, that it's installed correctly!
good luck!

The toner leak can cause the optical pair responcible for the toner sencing to become dirty. The easiest way to try and rectify this is to vacuum clean the area under the drum unit. At the left side of that area there is a small lever with the magnet in it. Check if it moves smoothly. Vacuum clean everything around that lever. There can be some other reasons worth to check. I put them in this article: http://www.kudesnik.net/faq/mono/fm005.php It's all in Russian but using online translators and looking at the pictures you'll be able to catch the idea of what should be checked.

Depending on the age of the model, it could be a couple of things. ***Never touch the drum or expose it to bright light*** The drum unit is bad. It's the shiny brightly-colored large roller in the center of the machine. On most recent smaller machines like this on it's integrated into the toner cartridge. Check it out. If it has toner build up on the ends, it's bad. or The corona wires need cleaning. Some machines have a small slide that moves from one side of the printer to the other which cleans the hidden corona wires. It's usually brightly colored .

You should certainly start by looking at the toner cartridge to see if there is any tape to remove. If there is no tape with a visible pull tab, check inside the printer to make sure that there are no pieces of torn paper stuck anywhere inside.

Step 1. Open Top Cover.(Press the oval button RHFront)
Step 2. Tilt Drum Unit by lifting slightly at the front.(The Toner cartridge sits in the top of this)
Step 3. Remove Drum Unit by lifting straight up.
Step 4. Insert "NEW" Drum Unit. (Steps 3 and 2 in reverse order and direction(s))

This sounds like it could be a "toner Sense" error / try removing the drum unit and cleaning the 6 contacts on the left inside of the printer

No reset need to fix fault then clears...

Replace Toner Cartridges with Gen OKI new ones... are you using non oki product? Cause Toner carts, thats where I would start looking cause the error is the machine not receiving correct information from a little chip built into the toner cartridges to allow operation to begin.

The Solution is:
You must have the Oki Monitor Software installed
When you enter in to the software you have a button that say "Maitenace", then you have a option that says " Reset Drum Counter" or somthing similar. Click on the option and the message disappear from the display.
Sorry my bad english

charging connections are not properly connected