Lines in printing

When you use the flatbed the copy is perfect because the ccd sensor is under the glass cover and obviously is free form dust/ dirt.
On the other hand if you use the feeder the ccd sensor is located in between the roller assembly (not sure exactly for this model).
This means that the page is scanned by the ccd in the feeder, any dirt on the ccd will appear as a black line. I assume that you are feeding papers from the side and not from the top that is why you get a horizontal line.

A quick test to see if the ccd sensor is dirty is to feed the paper from the top side to the feeder. If you get a vertical line it is a proof that your ccd sensor needs to be cleaned.
The worst case is that the sensor in the feeder assembly has a tiny spot that is damaged and it is causing the black line.
So , first try the test, then open the feeder assembly, locate the ccd and clean it. Hope that this helps.

No black line while you scan, but it only appears while you are printing?

my copier nashuatec 3722 .when start copier give me code E-4

Perhaps did not specify paper thickness (check control panel and print driver).
Toner getting low.
Clean registration roller with clean damp cloth.

change the setting for the paper to Plain letter setting on the printer and the computer

I’m happy to help further over the phone at https://www.6ya.com/expert/ron_9356d26241d4cbf7

Clean the small piece of glass on the flat bed. Should be on the left side of the flat bed when you lift the doc feeder.

To solve the printing problem..


# Hold the cartridge upside down, with the bar-code label facing you and take a damp paper towel.
# Use the towel to wipe the printhead of the cartridge on the bottom (where the ink comes out). Wipe the printhead horizontally in one direction only (left to right).
# Continue doing this until it looks clean.
# Then dab the cartridge on the towel to make sure the ink is flowing.
# Next, look inside the printer and locate the carrier that holds ink cartridges. Caution: Make sure the cartridges are not installed at this point.

1. Look for a shiny piece of metal underneath the contacts at the back of the carrier.
2. Take a damp cotton swab (use water only!) and wipe along the bottom of the shiny metal piece. Note: You may need more than one swab.

# Reinstall the cartridges, making sure you snap them correctly into the printer. 


Hope this help. Please Rate My Response! Thanks! 
PREM

See Charge roller my be dirty or Catriges PCU Units

Hi there,

I believe there are 3 possible causes for this issue; toner drum, fuser or transfer roller - more than likely I would dismantle the printer and check for lines on the fuser. But just in case remove the toner and carefully release the flap to reveal the toner drum - if that is scored and the lines correspond to those on the print-out thats the cause.

Rgds Colin

check the "photoconductor unit" (pg 37 in the Maintance manual)

ours was doing it with the magenta and saw a faint 'scratch' on the roller. will attempt to replace and report back if this fixes it.