Helo every body, plees tell me how to fix problem on konica minolta 7255. On display universal paper tray 3 choosed deactivated

SOURCE: konica minolta 2430 DL paper jam

Place a few papers in the tray.
Open up the top, pull out the main (green handle) thingy.
In the very bottom you will see a bar with a single large round rubber wheel in the middle, and white gears on both ends of the bar.
Manually turn the right side gear toward you.
As you do this, you will see the paper lift up and as the rubber wheel turns you will see that it has a notch on the bottom side.
Turn the gear, and watch the rubber wheel until the notch on the rubber wheel is facing up and away from you (and the paper is fully engaged).
Then put the green-handle thingy back in, close the printer, and it should work.
Apparently this resets something.  I have done it a number of times - usually after a paper jam.

SOURCE: konica minolta 2430

Most likely you received this message after a toner was replaced. Reseat the cartridge and restart the printer. If that doesn't work remove all of the toner cartridges manually and reinstall.

Turn off the printer and open the top cover. Follow the toner cartridge all the way to the right side of the printer (on the white part). You should see a hole that looks like a cross. Take a pen or key and push down on the black button in that hole. While you are holding it down rotate the toner cartridge towards you. You want to get the colored roller on the cartridge about 1/2in away from the metal bar that says "consumable reorder". You should be in a position to take out the toner. Let go of the hole and remove the cartridge. Repeat the steps until all of the cartridges have been removed.

Turn the printer back on at this point. You are going to get toner not installed messages on the printer. Open the top cover and the cyan tray will be in place. Shake the toner and install. Close the cover and let it cycle to the next color (black). Repeat the process until all cartridges are installed.

If you are still getting the error you either have a bad cartridge or the carousel that the toners sit in is damaged.

SOURCE: konica minolta problem

How to reset an F34, F35, or F36 code.
Solution:
To clear the code, perform the following:
1. Turn the machine OFF.
2. Enter the 25 mode, (turn the machine ON, while pressing the 2 and 5 keys).
3. Select 1: Software Switch Setting.
4. Use the arrows on the LCD to select dipswitch 3-1.
5. Touch the OFF key on the LCD to change the data to 0.
6. Press RETURN.
7. Power the machine OFF/ON to exit the 25 mode. PLEASE. NOTE;
THIS IS ONLY TO RESET THIS CODE ,IF IT CAN;T BE CLEARED THAN YOU NEED TO Replace the temperature sensor assembly

SOURCE: konica minolta 1350w status display comes on at start up

Open c:\windows\system32
find a file called MSTMON_Q.EXE

right click and rename the file to anything with a file extension .exe, I named it MSTMON.EXE

Create a shortcut to this new file in case you need it in the future and put the shortcut on your desktop

also, write the original name of the file down or put it on notepad, in case you want to change it back.

restart windows

SOURCE: konica minolta pagepro 1400w paper jam

have you tear the paper when removing? there is a small paper left still inside the paper path. open the back side and the top part and check for small paper. I hope that will solve your problem and if think the problem still there the problem is one of the paper sensor actuator is broken or out of place.