Samsung SCX-4521FR Manual De Usuario

Troubleshooting

9.8

Pages print,
but are blank.

The toner cartridge is
defective or out of
toner.

Redistribute the toner, if
necessary. See “Redistributing
Toner” on page 8.4.
If necessary, replace the toner
cartridge.

The file may have
blank pages.

Check the file to ensure that it
does not contain blank pages.

Some parts, such as
the controller or the
board, may be
defective.

Contact a service representative.

An error
occurs
repeatedly
when you are
printing with
the USB
connection.

When the USB mode is
set to “Fast”, some PC
user may experience
poor USB
communication.

Change the USB mode to “Slow”.
To do so, follow these steps:
1. Press Menu until “Machine

Setup” appears on the display.

2. Press the scroll button ( or )

until “USB Mode” appears on
the bottom line and press
Enter.

3. Press the scroll button ( or )

to select “Slow”.

4. Press Enter to save the

selection.

5. Press Stop/Clear to return to

Standby Mode.

Condition

Possible cause

Suggested solutions

Printing Quality Problems

If the inside of the machine is dirty or paper has been loaded
improperly, you may notice a reduction in print quality. See the
table below to clear the problem.

Condition

Suggested solutions

Light or faded
print

If a vertical white streak or faded area appears on the
page:
• The toner supply is low. You may be able to temporarily
• extend the toner cartridge life. See “Redistributing

Toner” on page 8.4. If this does not improve the print
quality, install a new toner cartridge.

• The paper may not meet paper specifications; for

example, the paper is too moist or too rough. See
“Paper Specifications” on page 10.3.

• If the entire page is light, the print resolution setting is

too low or the toner save mode is on. Adjust the print
resolution and turn the toner save mode off. For
details, see Software User’s Guide and “Toner Save
Mode” on page 2.11, respectively.

• A combination of faded or smeared defects may

indicate that the toner cartridge needs cleaning. See
“Cleaning the Drum” on page 8.5.

• The surface of the LSU part inside the machine may be

dirty. Clean the LSU (“Cleaning the Inside” on
page 8.2). Contact a service representative.

Toner specs

• The paper may not meet specifications; for example,

the paper is too moist or too rough. See “Paper
Specifications” on page 10.3.

• The transfer roller may be dirty. Clean the inside of

your machine. See “Cleaning the Inside” on page 8.2.

• The paper path may need cleaning. See “Cleaning the

Drum” on page 8.5.

Dropouts