My machine show the line "The imaging unit needs to be changed". How to fix it??? Thank you

Does this machine have drum units, image units and toner units? what combination? Replacing the toner cartridge will not fix the issue with the drum or image unit.

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replace the cyan image unit with OEM unit

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

If your printer prints with faded bands similar to this: The problem is with the developer in the imaging unit. The problem can be fixed by either replacing the imaging unit for $100+ or you can fix it yourself by cleaning the imaging unit. You will need simple hand tools and if you are careful restore the print quality of your printer. I have a link to instructions that should help you http://www.fixya.com/support/r4120906-clean_developer_blades_samsung_clp_300 Hope this helps you.

They will be lost if already in the copiers memory. Normally I would not turn off the power to the copier to change out an imaging unit. You should be able to swap it out without turning off the power. That way once the new unit is installed and has been calibrated the print jobs will finish normally.
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This is caused by either a problem with the Transfer Belt Unit or the Cyan Imaging Unit. Since the lines are only in Blue (Cyan) I would more suspect the Cyan Imaging Unit. These can be released and slid out of the machine very easily and you could look at the drum to see if the lines are there. When you slide out the unit the drum (long greenish colored cylinder) is right there on top and it should be clean with no toner lines on it. If there are lines then that would be your proof. Also try using your cleaning tools on the Imaging Units as well. This is the wand that is clipped inside the front door. There are also little blue knobs on the units you can pull out and push in a few times to clean wires inside the units. This will sometimes fix the lines. If not you may have to have the Cyan I/U changed.
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Did you turn the main power switch OFF then back ON? You need to do that to reset the counter. Also, did you put a brand new one in from a closed box or a used one? If it is a new one & it will not clear, return it to where you got it from... Good Luck

The yellow and magenta image units may be the problem. Yellow may have worn out on one end causing the yellow line. If the pink dots show up on every page but move around from page to page, there may be damage to the magenta image unit. You can remove the image units from the machine and look at the drums (long green cylinders), this should be shiny and clean. If not, you may need to replace.

There are small mirrors on the copy lamp, wipe with a clean dry soft cloth. Remove the drum unit and wipe upper part where the drum unit was and make sure the area is clean.

These units are automatically reset with a fuse. When you put the imaging unit in it will completes a connection which resets the count then simultaniously blows the fuse. Sometimes the fuse blows before the reset, which is what it sounds like happened here. The machine should print normally but the error will persist until the unit is replaced with a new one. Is the the imaging unit an OEM unit or remanufactured? Whoever you got the unit from should replace it as defective free of charge. If it is OEM you might have to go through Xerox to get it replaced. I don't know if the Big Box stores will.

IF WORDS GET STRETCHED ONLY ON RECEIVING AND NOT ON PRINTING OR COPYING FRONM THE MACHINE, THE PROBLEM LIES WITH THE TELEPHONE LINE DISTURBANCE YOU MAY TRY GETTING THE PHONE LINE CHECKED /CHANGING THE CABLE LENGTH SETTING OR ATTENUATION LEVEL IN THE TECHNICAL MODE.. HAPPY FAXING OMNIPRESENT.