Cleaning the drum unit; 11 - 17; White Spots on black text and - Page 104

Brother MFC-7820N User's Guide

2014 Dodge Charger SRT Owner Manual

Table of Contents

USER'S GUIDE MFC-7420/MFC-7820N
background image

Chapter 11

11 - 17

White Spots on black text and 

graphics at 3.1 in. 

(78.5 mm) intervals

Black Spots at 3.1 in. 

(78.5 mm) intervals

Cleaning the drum unit

Dust, paper powder, glue, and so on may stick to the surface of the photosensitive 
drum (OPC) and cause black or white spots to appear on printed documents.

Make a few copies of a blank, white sheet of paper. (See 

Making multiple copies

 

on page 8-2.)

If you still see the spots on printed documents after making multiple copies, clean 
the drum unit as follows:

1 Remove the drum unit and toner cartridge assembly, and then remove the toner 

cartridge from the drum unit.

2 Position the print sample in front of the drum unit so you will know the exact 

position on the drum that is causing the poor print.

3 Turn the black gear on the drum as you check the surface of the OPC drum.

The OPC drum is photosensitive so do not touch it with your fingers.

4 When you find the substance on the drum surface that matches the print 

sample, gently 

dab

 the surface of the OPC drum with a cotton swab that is lightly 

dampened with isopropyl alcohol.

Do not

 

use a scrubbing or wiping motion because this might damage the 

drum.

Do not try to clean the surface of the OPC drum with a sharp object, such as 
a ball-point pen, because this might cause permanent damage to the drum 
unit.

If the print quality still has not improved you need to install a new drum. 
(See 

Replacing the drum unit (DR-350)

 on page 11-28.)

Examples of poor print quality

Recommendation

3.1 in.
(78.5 mm)

3.1 in.
(78.5 mm)

3.1 in.
(78.5 mm)

3.1 in.
(78.5 mm)

OPC drum surface

Detailed Information for Brother MFC-7820N User's Guide

Lists of information found in Brother MFC-7820N User's Guide - Page 104

  • 3.1 in.
  • 78.5 mm) intervals Black Spots at 3.
  • 78.5 mm) intervals Cleaning the drum unit Dust, paper powder, glue, and so on may stick to the surface of the photosensitive drum (OPC) and cause black or white spots to appear on printed documents.
  • 2.) If you still see the spots on printed documents after making multiple copies, clean the drum unit as follows: 1 Remove the drum unit and toner cartridge assembly, and then remove the toner cartridge from the drum unit.
  • 28.) Examples of poor print quality Recommendation 3.
  • 78.5 mm) 3.
  • 78.5 mm) 3.
  • 78.5 mm) 3.

Related Documents for Brother MFC-7820N User's Guide