I have scx-5300 samsung machine and having a problem on copying, whenever i used to copy a black line is coming out on the copy of the original...

Question edited for a lot more clarity.
Question moved to model category.

This is a commercial quality machine that would need a dealer technician, but there are some things you can try.

Any Error Codes? They can all be Google and the website PrintCopyInfo lists them all.

Clear the Print Jobs, remove the wall plug for 5 minutes. Press and hold the Print button for 30 seconds. Plug back in. Make sure all the machine doors are closed and pull out and push back all the paper trays.

Manual and troubleshooting in the manual.

https://www.google.com/search?q=Samsung+SCX-6555+not+printing

HP / Samsung Support. There are Printer Diagnostic Tools listed.

https://support.hp.com/ca-en/drivers/selfservice/samsung-multixpress-scx-6555-laser-multifunction-printer-series/17157183

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You have to change the cable in the scanner. It will resolve.

When you scan and or copy are you loading them in the place??....If you are not try cleaning the glass and the rollers..Any type of dust. dirt or hair will leave and artifact on the copy...

HI PLEASE CLEAN THE CCDUNIT .YOUR PRINTER CCD UNIT IS VERY LOTS OF DEST.AFTER CLEANING CCD THEY PRINT SAMSE SO REPLACE CCD UNIT WITH CABLE

Problem Cause Solution Colored lines appear. The exposure glass or scanning glass is dirty. Clean them. See "Maintaining Your Machine", About this Machine . Copies appear dirty. Image density is too high. Adjust the image density settings. See "Adjusting Copy Image Density", Copy and Document Server Reference . Copies appear dirty. Auto Image Density is not selected. On the control panel, select [Auto Density]. The reverse side of an original image is copied. Image density is too high. Adjust the image density settings. See "Adjusting Copy Image Density", Copy and Document Server Reference . The reverse side of an original image is copied. Auto Image Density is not selected. On the control panel, select [Auto Density]. A shadow appears on copies if you use pasted originals. Image density is too high.

• Adjust the image density settings. See "Adjusting Copy Image Density", Copy and Document Server Reference .
• Change the orientation of the original.
• Put mending tape on the pasted part.

The same copy area is dirty whenever making copies. The exposure glass, scanning glass, or ADF is dirty. Clean them. See "Maintaining Your Machine", About This Machine . The same copy area is dirty whenever making copies.

• The original that has already been printed is scanned.
• Original Type is set to [Text / Photo], and an original with text and photographs that can hardly be distinguished from each other is loaded.

On the control panel, press [Generation Copy], and then begin copying. Copies are too light. Image density is too light. Adjust the image density settings. See "Adjusting Copy Image Density", Copy and Document Server Reference . Copies are too light. A light copy may result when you use damp or rough grain paper. Use recommended paper only and be sure its storage environment meets the recommended temperature and humidity conditions. For details about recommended paper and the proper way to store it, see "Recommended Paper Sizes and Types" and "Paper Storage", About This Machine . Parts of images are not copied. The original is not set correctly. Set originals correctly. See "Placing Originals", Copy and Document Server Reference . Parts of images are not copied. The correct paper size is not selected. Select the proper paper size. Parts of images are not copied. Even if you place originals in the ADF correctly, margin of a few millimeters on all four sides of the original might not be copied. Use "Create Margin" function to reduce the image of its original size.
For details about missing image area, see "Missing Image Area", Copy and Document Server Reference . images appear only partially. The paper is damp. Use paper that has been stored in the recommended temperature and humidity condition. For details about the proper way to store it, see "Paper Storage", About This Machine . Black lines appear. The exposure glass or scanning glass is dirty. Clean them. See "Maintaining Your Machine", About This Machine . White lines appear. The exposure glass or scanning glass is dirty. Clean them. See "Maintaining Your Machine", About This Machine . White lines appear. The dustproof glass is dirty. Clean the dustproof glass. See "Cleaning the Dustproof Glass", About This Machine . Copies are blank. The original is not set correctly. When using the exposure glass, face the originals down. When using the ADF, face them up. A moir? pattern is produced on copies. Your original has a dot pattern image or many lines. Place the original on the exposure glass at a slight angle. Black spots appear on the copy of a photographic print. Because of high humidity, the photographic print has stuck to the exposure glass. Place the print on the exposure glass in either of the following ways:

• Place an OHP transparency on the exposure glass, and then place the print on the OHP transparency.
• Place the print on the exposure glass, and then place two or three sheets of white paper on it. Leave the ADF open when copying.

White stripes appear on the OHP. Fragments of paper are stuck to the OHP. Use a dry cloth to wipe any paper fragments off the back of the OHP. The image on the back side of duplex copies has mottled blank patches or is smudged. Missing patches and smudges are caused by moisture leaking from the paper.

• Do not install the machine in areas that are susceptible to low temperatures.
• Use paper that has been stored where temperature and humidity conditions meet the limitations we recommend. For details about the paper storage conditions we recommend, see "Paper Storage", About This Machine .
• Install the Optional anti-humidity heater. For details about the anti-humidity heater, contact your service representative.

When You Cannot Make Clear Copies

This black line sounds like it is definately coming from the ADF scanner glass. This is the thinner strip of glass that is located just to the left of the large original glass. You can verify this by making a copy from the large glass instead of using the feeder on top. If the copy comes out clean then it is definately the scanner glass. Just clean the glass well with glass cleaner and a soft cloth. This glass is only used when copying/scanning using the top automatic feeder
Good Luck and Thank You for using Fixya.
WheatlandServices

I have a samsung scx-4521f i am trying to copy some document but i cannot copy clean. my printer was copy in document black line or black paper ground what do i need to clean copy ? please help me.

check ur machine drum catridge, maybe it getting damage or some dust is blocking in drum unit.

By using the Duplex button on your machine, you can set the machine to
print copies on both sides of paper.
1 Press Duplex.
2 Load originals face up in the ADF.
3 Press the Scroll buttons until the binding option you want appears.
• Off: Prints in Normal mode.
• 1->2Side Short: Prints pages to be read by flipping like a note
pad.
• 1->2Side Long: Prints pages to be read like a book.
• 2->1Side: Scans both sides of the original and prints each of them
on separate two papers. (SCX-6322DN only)
• 2->2Side: Scans both sides of the original and prints them on both
sides of a paper, this function produce exactly the same print out
from the original. (SCX-6322DN only)
• 2->1Side Rotate2: Scans both sides of the original and prints one
of them on separate two papers, but the information on back side
of the original is printed 180° rotated. (SCX-6322DN only)
4 Press OK to save your selection.
If the mode is enabled, the Duplex button is backlit.

Collation

You can set the machine to sort the copy job. For
example, if you make 2 copies of a 3 page original,
one complete 3 page document will print followed by a
second complete document.
1 Press Copy.
2 Load originals face up into the ADF.
For details about loading an original, see
page 5.1.
3 Enter the number of copies using the number
keypad.
4 Press Menu until Copy Feature appears on the
bottom line of the display and press OK.
5 Press OK when Copy Collation appears.
6 Press the Scroll buttons to select Yes.
7 Press OK or Start to begin copying.
One complete document will print

http://www.websitetoolbox.com/mb/copierquestions

The darkest copy setting is obtained when the contrast is set to dark and the toner save is turned off. If the originals being copied are too light, this unit has trouble seeing the image and the copies are extremely light as well. If the originals are good and dark, try using original toner cartridges.

Be blessed.