20 Most Recent Samsung SCX-3400 All-in-one Laser printer SAMSUNG Questions & Answers

Toner powder level is too low in the cartridge, you may refill the toner powder in the cartridge with a Samsung compatible toner(not made by the Samsung), or an option to replace the cartridge with a Samsung's MLTD 101 S genuine toner.

Check the feeder roller inside the printer for any foreign substance stuck to the roller, this may cause it not to grip properly. You can also try a few sheets at a time and make sure the paper tray is gripping the paper, but not too hard. If this fails, the roller may be out of place somewhat, try to reposition it. Let me know how you get on.

Uninstal a driver and reinstall the new driver or reinstall samsung universal printer driver 2 or 3,or try change in the existing driver the protocol language.

for scx 4021 , uses scxd4725a toner , cover the toner chip with tape , else replace chip

read thiis How To Scan Multiple Pages To One File In Easy Document Creator

diver faulty or bad usb

no , service technician required

I Think Try to change Cleaning Blade. If you have an spare cartridge check it.

http://www.samsung.com/pk/support/model/SCX-3400/SAU-downloads?downloadName=SW

first your printer driver correct version install ,then check after samse probelem you must replace the data cable then check after samse problem shuarly your printer formatter card complaint please replace the formattercard try it