Samsung SCX-4521F Troubleshootin

Troubleshooting

Samsung Electronics

Service Manual

6-1

6

6. Troubleshooting

6.1 Checking Symptoms

Before attempting to repair the printer first obtain a detailed description of the problem from the customer.

Power On

Indicate

Error Massage

Ready or

Power save

Test Print

printing

Quality is

Nomal?

Refer to "Solution

of Image Problem"

Refer to

Error Massage

<Chapter 4.4>

END

- No Power

- Power Module error

- Main PBA error

- LCD Panel error

OP Panel

ON?

Samsung Electronics

Service Manual

Troubleshooting

6-2

6.1.1 Basic Check List

1. Check the Power.

• Does "Warming Up" appear on the display?

--> If not check power cable, switch or SMPS.

--> Does the wall socket work?

• Do the Motors or other components initialize (listen for main motor, fan and LSU sounds)?

--> If not or there are none of the normal startup sounds check cable, switch or SMPS.

--> Does the wall socket work?

2. Check the LCD Panel.

• Is there any display at all?

--> If not check power cable, switch or SMPS.

--> Does the wall socket work?

• Is the display a meaningful message care there any broken or badly formed characters?

--> Check the main PBA and cable harness.

• Is the message on the LCD Panel a standard error message?

--> Refer to section 4.3

3. Check the Paper Path

• Is there a Paper Jam?

--> Remove any paper fragments caught in the paper path.

• Paper Jam occurs repeatedly at a specific point in the Paper Path

--> Open the fuser cover, Jam clear.

--> Dismantle the machine and carefully inspect the region where the jam occurs.
(Especially, check if paper fragments are caught in the Fuser

4. Print the Information Page (Configuration).

• Try printing a test page from a computer.

--> If there is an error check cables and driver installation.

5. Check the Print Quality.

•Is there are a Print Quality Problem?

--> Refer to section 6.5

6. Check consumables (toner etc.).

•Using the keys print the Test Pattern.

--> Expected life of various consumable parts, compare this with the figures printed and replace as required

Troubleshooting

Samsung Electronics

Service Manual

6-3

6.1.2 Initial Inspection

1. Check Power part

1. The printer does not work no matter how long you wait.
A. Is the Power Switch (printer and wall socket) turned on ?
B. Is the Power Cord connected to the printer correctly ?
C. Is the Power cord connected to the wall socket correctly ?
D. Is wall socket working ?
E. Is the unit rated at the same voltage as the supply ?

2. Does the Fan work when power is turned on?
A. Check the connectors on the SMPS.
B. Check the fuses in the SMPS.(F1)

2. Check the Installation Environment.

1. Ensure the installation surface is flat, level and free from vibration.

If necessary move the printer.

2. Ensure that the temperature and humidity of the surroundings are within specification

If necessary move the printer.

3. Ensure that the printer is position away from any air conditioning or other heating or cooling equipment. Also ensure
that is not positioned in a direct draft from any air conditioning, fan or open window.

If necessary move the printer.

4. Ensure the printer is not positioned in direct sunlight.

If it is unavoidable use a curtain to shade the printer.

5. Ensure the printer is installed in a clean dust free environment.

Move the printer to clean area if necessary.

6. Some industrial or cleaning processes give of fumes which can affect the printer.

Move the printer away from this type of air pollution

3. Check paper type.

1. Use only paper which is of a suitable quality, weight and size?

See the user guide.

4. Check the overall condition of the printer

1. Is the printer properly maintained ?

Clean the Paper Transport Passages.
Any rollers with dirt surfaces should be cleaned or replaced.

Samsung Electronics

Service Manual

Troubleshooting

6-4

• Description Printing begins at wrong position on the paper.

Check and Cause Solution

Wrong sense time caused by defective feed sensor
actuator.

Replace the defective actuator

Check and Cause Solution

1. Check the Solenoid by using Engine Test Mode-Pick
up Test.

2. Check if the pad is loose due to bad sealing of the
side-pad.

3. Check the surface of the roller-pickup for foreign mat­ter.

4. If the paper feeds into the printer rand Jam 0 occurs,
perform Engine Test Mode-Feed Sensor Test.

1. Replace the solenoid.

2. Replace the side-pad Assembly Lor R, if necessary.

3. Clean with soft cloth dampened with IPA(Isopropyl
Alcohol) or water.

4. Replace the SMPS, HVPS or Sensor.

6.2.2 JAM 0

• Description

1. Paper is not exited from the cassette.

2. Jam-0 occurs if the paper feeds into the printer.

BIN PATH

6.2 Bad discharge

6.2.1 Wrong Print Position

Troubleshooting

Samsung Electronics

Service Manual

6-5

Check and Cause Solution

1. If the recording paper is jammed in front of or inside
the fuser.

2. If the recording paper is stuck in the discharge roller
and the fuser just after passing through the Actuator­Feed, Feed Actuator may be defective.

1. Replace the SMPS.

2. Reassemble the Actuator-Feed and Spring-Actuator
if the returning is bad.

6.2.3 JAM 1

• Description

1. Recording paper is jammed in front of or inside the fuser.

2. Recording paper is stuck in the discharge roller and in the
fuser just after passing through the Actuator-Feed.

BIN PATH

Check and Cause Solution

1. If the paper is completely fed out of the printer, but Jam
2 occurs : Exit sensor is defective.

• After the paper is completely discharged, actuator

Exit should return to the original position to shut the
photo-sensor. Sometimes it takes longer hour than it
should and does not return.

2. If the paper is rolled in the Fuser Roller:

• This occurs when a Guide claw is broken away or

transformed.

• It occurs when the Spring of a Guide claw is broken

away or transformed.

• It occurs when the Heat-Roller or Pressure-Roller is
seriously contaminated with the toner.

3. Paper is accordion in the fuser.

1. Check if the exit sensor actuator is defective.

• Check if the actuator exit is unformed (Check if the
lever part is unformed in shape).

• Check whether burrs occur in the assembly part of
the actuator exit or not and if the actuator is
smoothly operated.

• Check if foreign matters and wire get caught in the
actuator exit's operation.

2. If the paper is stuck in the fuser : disassemble the
fuser and remove the jammed paper, and clean the
surface of the pressure roller with dry gauze.

3. Remove the jammed paper after disassembling the

fuser : Clean the surface of the pressure roller with
dry gauze.

• Remove the toner particles stained on the rib.

• Check the assemblage and performance of the exit.

6.2.4 JAM 2

• Description

1. Recording paper is jammed in front of or inside the fuser.

2. Recording paper is stuck in the discharge roller and in the
fuser just after passing through the Actuator-Feed.

BIN PATH

Samsung Electronics

Service Manual

Troubleshooting

6-6

6.2.5 Multi-Feeding

• Description Multiple sheets of paper are fed at once.

Check and Cause Solution

1. Solenoid malfunction(the solenoid does not work
properly): Perform Engine Test Mode-Pick up Test.

2. Pad-Friction is contaminated with foreign matter.(oil...)

3. The face of paper is blended.

1. Replace the solenoid if necessary.

2. Clean the pad friction with soft clothe dampened
with IPA(Isopropyl Alcohol).

3. Use the smooth paper.

6.2.6 Paper rolled in the Fuser

• Description If contaminated at intervals of 57mm on the back of a paper.

Check and Cause Solution

1.

Contamination of the pressure roller or heat
roller (Background, Hot off set).

2.

Check the claw of the fuser whether it is unfit­ted.

1.

After disassembling the fuser, clean contami­nation between the heat roller and the ther­mostor and remove the contamination of the
pressure roller.

2.

If there is heavy background, repair it by the
background troubleshooting method.

3. The surface of the heat roller with IPA or

water

4. Check the warp or separation of the sprint

claw and the holder plate claw, and then man­age it.

Troubleshooting

Samsung Electronics

Service Manual

6-7

6.2.7 Paper rolled in the Toner Cartridge (OPC Drum)

• Description Paper is rolled up in the OPC.

Check and Cause Solution

1. Paper is too much thin.

2. The face of paper is curled.

1. Recommend to use normal paper.

2. How to remove the rolled in the OPC Drum.

• Remove the paper while turning the OPC
Drum against the ongoing direction.

Samsung Electronics

Service Manual

Troubleshooting

6-8

6.3 Set Malfunction – Causes and Solutions

6.3.1 LCD Display Defect ( in LCD Display)

• Description

Strange characters are displayed in the LCD Window and OPE Panel buttons do not work.

Check and Cause Solution

1. Clear the memory.

2. Check that the OPE HARNESS is connected to
the Connection Board correctly.

1. Try again after clearing the memory.

2. If re-connecting the harness does not correct
the fault replace the OPE Ass’y and the main
Board in sequence.

6.3.2 Defective OPE Keypad

• Description

Pressing keys does not cause the set to respond correctly

Check and Cause Solution

1. Clear the memory.

2. Check that there is an audible key click when a key is
pressed.

1. Check that the keypad is assembled correctly and
the membrane is not damaged, replace the
membrane or whole keypad assembly if necessary.

2. If the fault remains replace the OPE Ass’y and the
Main board in sequence.

Troubleshooting

Samsung Electronics

Service Manual

6-9

6.3.3 Fuser gear melts due to overheating causing Paper Jam.

• Description

Constant Jam where paper is entering Fuser unit.
Fuser rollers do not turn

Check and Cause Solution

1. Check the Heat Lamp, thermostat and thermistor 1. Use Engine Test Mode to test the Fuser

-THERM ADC 120.
Replace Fuser unit

Replace SMPS or Main PBA as appropriate.

6.3.4 Paper Empty

• Description

Paper Empty is displayed in the LCD panel even when paper is loaded in the cassette.

Check and Cause Solution

1. Deformed paper sensor actuator or faulty sensor.

2. SMPS PBA or Main PBA is defective

3. Faulty cables or connectors.

1. Replace the defective actuator or sensor.

2. Replace the SMPS PBA or MAIN PBA as
appropriate.

6.3.5 Paper Empty without indication

• Description

The paper empty message does not appear in the LCD when the paper cassette is empty.

Check and Cause Solution

1. Deformed paper sensor actuator or faulty sensor.

2. SMPS PBA or Main PBA is defective
.

1. Replace the defective actuator.

2. Replace the SMPS PBA or MAIN PBA as
appropriate

Samsung Electronics

Service Manual

Troubleshooting

6-10

6.3.7 No error message when the cover is open

• Description

The Cover Open message does not appears on the LCD even when the print cover is open.

Check and Cause Solution

1. The ‘Open Cover’ microswitch may be stuck or faulty

2. Check the connector and cables between HVPS and
main PBA.

1. Use

TECH

mode(“cover sensor test”) to check
cover switch operation. Check and replace switch if
necessary .

2. Replace the Main Control board or HVPS S/W as
necessary .

6.3.6 Cover Open

• Description

The Cover Open message appears on the LCD even when the print cover is closed.

Check and Cause Solution

1. The ‘Open Cover’ microswitch may be stuck or faulty

2. The tab on the front cover may be damaged or broken

3. Check the connector and cables between HVPS and
main PBA.

1. Use

TECH

mode(“cover sensor test”) to check
cover switch operation. Check and replace switch if
necessary .

2. Replace the front cover.

3. Replace the Main Control board or HVPS as
necessary .

Troubleshooting

Samsung Electronics

Service Manual

6-11

6.3.10 Printed Vertical Lines become curved

• Description

When printing, vertical lines are not straight.

Check and Cause Solution

1. Check stability of 24V supply to LSU. 1. 24V stable - Replace LSU.
24V unstable replace SMPS, if the problem persists
replace the main PBA.

6.3.8 Defective motor operation

• Description

Main motor is faulty and paper does not feed into the printer, resulting in Jam 0'

Check and Cause Solution

1. The main motor harness or Motor PCB may be faulty. 1. Check the motor harnesses and connectors, replace
if defective.. If the problem persists replace the main
PBA.

Note Check motor operation using Engine Test Mode.

6.3.9 No Power

• Description

When system power is turned on the LCD panel does not come on.

Check and Cause Solution

1. Check if the power input and SMPS output are normal.

2. LCD panel does not come on but normal start up

sounds are heard.

3. After replacing SMPS display does not come on and no

start up sounds are heard.

1. Replace the power supply cord or SMPS. Check
power fuse and SMPS fuses replace if necessary.

2. Replace the OP panel.

3. Replace the main PBA.

Samsung Electronics

Service Manual

Troubleshooting

6-12

6.4 Bad Software Environment

6.4.1 The printer is not working (1)

• Description

While Power turned on, the printer is not working in the printing mode.

Check and Cause Solution

1. Run Self-Test Mode : Turn the power on and pressing
“System Data List” by pressing Menu-Reports-System
Data.

2. Check if the PC and the printer is properly connected
and the toner cartridge installed.

3. Printing is not working in the Windows.

4. Check if the printer cable is directly connected to periph­eral devices

1.Check the power of the printer and perform the Self­Test. If the test printing works, that means no prob­lems in the printer itself. If the test printing does not
work, that means bad functioning of the printer(not
because of software).

2. Replace the printer cable. If the problems not solved

even after the cable replaced, check the amount of
the remaining toner.

3. Check if the connection between PC and printer port

is proper. If you use windows, check if the printer dri ­ver in the controller is set up. If the printer driver is
properly set up, check in which program the printing
is not working. The best way to find out is to open the
memo pad to check the function of printing. If it is not
working in a certain program, adjust the setup the
program requires. Sometimes, the printout is normal
within the Windows basic programs, but it's not work­ing in a particular program. In such case, install the
new driver again. If not working in the Windows basic
program, Check the setup of the port of CMOS is on
ECP. And check the address of IRQ 7 and 378

4. If the scanner needs to be connected to the printer,

first the remove the scanner from the PC to see if the
printer is properly working alone.

Troubleshooting

Samsung Electronics

Service Manual

6-13

6.4.2 The printer is not working (2)

• Description

After receiving the printing order, no response at all or the low speed of printing
occurs due to wrong setup of the environment rather than malfunction of the printer itself.

Check and Cause Solution

1. Secure more space of the hard disk.

2. Printing error occurs even if there is enough space in
the hard disk.

3. Check the parallel-port-related items in the CMOS
Setup.

4. Reboot the system to print.

1. Not working with the message 'insufficient printer
memory' means hard disk space problem rather than
the RAM problem. In this case, provide more space
for the hard disk. Secure more space using the disk
utilities program.

2. The connection of the cable and printer port is not
proper. Check if the connection is properly done and
if the parallel port in CMOS is rightly set up.

3. As a printer port, Select ECP or SPP among
SPP(Normal), ECP, and EPP modes(increase print­ing speed) SPP normal mode support 8-bit data
transfer, while ECPMode transfer the 12-bit data.

4. If the regular font is not printing, the cable or the

printer driver may be defective.
Turn the PC and printer off, and reboot the system

to print again. If not solved, double-click the printer in
my computer If the regular fonts are not printed this
time again. the cable must be defective so replace
the cable with new one.

Samsung Electronics

Service Manual

Troubleshooting

6-14

6.4.3 Abnormal Printing

• Description

The printing is not working properly even when the cable has no problem.
(even after the cable is replaced)
If the printer won't work at all or the strange fonts are repeated, the printer driver may be defec­tive or wrong setup in the CMOS Setup.

Check and Cause Solution

1. Set up the parallel port in the CMOS SETUP.

2. Printer Driver Error.

3. Error message from insufficient memory.
(The printing job sometimes stops or due to insufficient
virtual memory, but it actually comes from the insuffi­cient space of the hard disk.)

1. Select SPP(Normal) or ECP LPT Port the among
ECP, EPP or SPP in the CMOS Setup.

2. Check the printer in My Computer.(to see if the
printer driver is compatible to the present driver or
delete

the old driver, if defective and reinstall the new

driver)

3. Delete the unnecessary files to secure enough
space of the hard disk and start printing job again.

Troubleshooting

Samsung Electronics

Service Manual

6-15

6.4.4 SPOOL Error

• Description

To spool which stands for "simultaneous peripheral operations online" a computer document or
task list (or "job") is to read it in and store it, usually on a hard disk or larger storage medium so
that it can be printed or otherwise processed at a more convenient time (for example, when a
printer is finished printing its current document).

Check and Cause Solution

1. Insufficient space of the hard disk in the directory
assigned for the basic spool.

2. If the previous printing error not solved.

3. When expected to collide with other program.

4. When an application program or the printer driver is
damaged.

5. When some files related to OS are damaged or virus
infected.

6. Memory is less than suggested one.

1. Delete the unnecessary files to provide more space
to start printing job.

2. If there are some files with the extension name of
****.jnl, Delete them and Reboot the Windows to
restart printing job.

3. Shut down all other programs except the current
one, if possible.

4. Delete the printer driver completely and reinstall it.

5 After rebooting the computer, check for viruses,

restore the damaged files and reinstall the program
to do the printing job.

6. Add up enough memory to the PC.

How to delete the data in the spool manager.

In the spool manager, the installed drivers and the list of the documents waiting to be printed are shown.
Select the document to be deleted and check the delete menu.

If you intend to delete the current document being printed, the data being transferred to the printer will be put
out and then the document is removed. Before choosing the document, the menu is still inactive.

Or put the document out of the list and repeat the routine as in the above or finish the spool manager.

Samsung Electronics

Service Manual

Troubleshooting

6-16

6.5 Bad image

6.5.1 Vertical Black Line and Band

• Description

1. Straight thin black vertical line occurs in the printing.

2. Dark black vertical band occur in the printing.

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

Check and Cause Solution

1. Damaged develop roller in the Developer.
Deformed Doctor-blade or cleaning­blade.

2. Scratched surface of the discharge roller
in the developer.

3. Partly depression or deformation on the
surface of the transfer roller.

1. If causes 1 and 2 occur in the developer
cartridge, replace the developer and try to
print out.

2. Replace the transfer roller if occurred as
No. 3.

6.5.2 Vertical White Line

• Description White vertical voids in the image.

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

Check and Cause Solution

1. Foreign matter stuck onto the window of
internal lenses of LSU mirror.

2. Foreign matter or toner particles between
the developer roller and blade.
(In case the life of the developer has
been expired, white lines or light image
occur in front of the image.)

3. It may occur when Burr and foreign sub­stances are on the window of the devel­oper frame.

4. If the fuser is defective, voids occur peri­odically at the top of a black image.

1. Foreign matter stuck onto the window :
Clean the LSU window with recommend­ed cleaner(IPA) Clean the window with a
clean cotton swab.

2. Foreign matter in the LSU : Open the
cover of LSU and clean with a cotton
swab on the surface of the reflex mirror.

3. No 3. : Remove the foreign matter and
burr of the exposure window.
(Developer cartridge)

4. No. 4. : Open the front cover and check
ribs that corresponds to the position of
the voids. Remove if found.

5. If the problems are not solved, replace
the developer cartridge.

Troubleshooting

Samsung Electronics

Service Manual

6-17

6.5.3 Horizontal Black Band

• Description

1. Dark or blurry horizontal stripes occur in the printing periodically.
(They may not occur periodically.)

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

Check and Cause Solution

1. Bad contacts of the voltage terminals to
developer.

2. The rollers of developer may be stained.
OPC Drum = 75.5mm
Charge Roller = 37.7mm
Supply Roller = 47.5mm
Develop Roller = 35.2mm
Transfer Roller = 46.2mm
Heat Roller = 63.9mm
Pressure Roller = 75.4mm

1. Clean each voltage terminal of the Charge,
Supply, Develop and Transfer roller.

(remove the toner particles and paper par­ticles)

2. Clean the right Gear that has relatively
small gap of the teeth in the OPC.

3. If the malfunction persists, replace the
developer.

6.5.4 Black/White Spot

• Description

1. Dark or blurry black spots occur periodically in the printing.

2. White spots occur periodically in the printing.

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

Check and Cause Solution

1. If dark or blurry black spots occur periodi­cally, the rollers in the Developer may be
contaminated with foreign matte or paper
particles.
( Charge roller : 37.7 mm interval

OPC drum : 75.5 mm interval)

2. If faded areas or voids occur in a black
image at intervals of 75.5 mm, or black
spots occur elsewhere, the OPC drum
surface is damaged.

3. If a black image is partially broken, the
transfer voltage is abnormal or the trans­fer roller's life has expired.

1. Run OPC cleaning Mode Print and run the
Self-test 2 or 3 times.

2. In case of 75.5 mm interval unremovable in
1, cleanly remove foreign substances stuck
on the OPC location equivalent to black
spots and white spots with a dry duster.

3. The transfer roller guarantees 50.000
sheets printing. If the roller's life is expired,
replace it.

4. In case of 37.7 mm interval unremovable in
1, take measures as to replace the develop­er cartridge and try to print out.

5. Clean the inside of the set against the paper
particles and foreign matter in order not to
cause the trouble.

Samsung Electronics

Service Manual

Troubleshooting

6-18

6.5.5 Light Image

• Description The printed image is light, with no ghost.

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

Check and Cause Solution

1. Develop roller is stained when the toner
of developer cartridge is almost con­sumed.

2. Ambient temperature is below than 10°C.

3. Bad contact caused by the toner stains
between the high voltage terminal in the
HVPS and the one in the set.

4. Abnormal output from the HVPS.

1. Check if the Toner Save mode is off.

2. R

eplace the developer cartridge and try to

print out.

3. Wait 30 minutes after printer is powered on
before you start printing.

4. Clean up the contaminated area by the
toner.

5. Replace the HVPS if the problems are not
solved by the above four directions.

6.5.6 Dark Image or a Black

• Description The printed image is dark.

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

Check and Cause Solution

1. No charge voltage in the engine board.

2. Charge voltage is not turned on due to
the bad contacts between power supply
in the side of the Developer and charge
terminal of HVPS.

1. Clean the high voltage charge terminal.

2. Check the state of the connector which
connects the engine board and HVPS.

3. Replace the HVPS if not solved by the
above direction 1 and 2.

Troubleshooting

Samsung Electronics

Service Manual

6-19

6.5.7 Uneven Density

• Description Print density is uneven between left and right.

Check and Cause Solution

1. The pressure force on the left and right
springs of the transfer roller is not even,
the springs are damaged, the transfer
roller is improperly installed, or the trans­fer roller bushing or holder is damaged.

2. The toner level is not even on the devel­oper roller due to the bad blade.

1. Replace both the left and right Spring
Holder.

2. Occur in the developer cartridge, replace
the developer and try to print out.

6.5.8 Background

• Description Light dark background appears in whole area of the printing.

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

Check and Cause Solution

1.

Does character exist less than 2%
per a page, and hasn’t it been used
long time?

2.

Does recycle paper be used?

3.

Has the life span of the developer
ended?

4.

Is the movement(Up and Down) of
the transfer roller smooth?

5. Is the HVPS normal?

1.

The toner cartridge is basically
designed to print 3,000 sheets with
5% image.

2.

The B/S is not guaranteed if using
recycle paper.

3.

Replace the developer when the life
span of it has been ended.

4.

Clean the bushing part of the transfer
roller.

5. If the problem is still not solved,

replace the developer.

Samsung Electronics

Service Manual

Troubleshooting

6-20

6.5.9 Ghost (1)

• Description Ghost occurs at 75.5 mm intervals of the OPC drum in the whole printing.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

75.5mm

Check and Cause Solution

1. Bad contacts caused by contamination
from toner particles between high voltage
terminal in the main body and the elec­trode of the Developer.

2. Bad contacts caused by contamination
from toner particles between high voltage
terminal in the main body and the one in
the HVPS board.

3. The life of developer is expired.

4. Transfer roller lifetime(50.000 sheets) has
expired.

5. Abnormal low temperature(below 10°C).

1. Clean the terminals when contaminated by
toner particles.

2. Occur in the developer cartridge, replace
the developer and try to print out.

3. Replace the Main board and HVPS Board if
not solved by the above directions 1-2.

4. If not solved by the direction 3, check the
transfer roller lifetime and replace it.

5. Wait about 1 hour after power on before
using printer.

6.5.10 Ghost (2)

• Description

Ghost occurs at 75.5 mm intervals of the OPC drum in the whole printing.
(When printing on card stock or transparencies using manual feeder)

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

75.5mm

Check and Cause Solution

When printing on card stock thicker than nor­mal paper or transparencies such as OHP,
higher transfer voltage is required.

Select 'Thick Mode' on paper type menu from
the software application and after using return­ing to the original mode is recommended.

Troubleshooting

Samsung Electronics

Service Manual

6-21

6.5.11 Ghost (3)

• Description White ghost occurs in the black image printing at 47.5mm intervals.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

47.5mm

Check and Cause Solution

1. The life of the developer may be expired.

2. The abnormal voltage and bad contact of
the terminal of the supply roller

1. Occur in the developer cartridge, replace
the developer and try to print out.

2. Check the approved voltage of the supply
roller and contact of the terminal and adjust
if necessary.

6.5.12 Ghost (4)

• Description Ghost occurs at 47.5mm(or 63.9mm) intervals.

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

47.5 or 63.9mm

Check and Cause Solution

The temperature of the fuser is maintained
high.

1. Disassemble the fuser and remove the
contaminated toner particles on the roller
and clean the foreign matter between
Thermistor and Heat roller.
( Caution : can be deformed)

6.5.13 Stains on the Face of Page

• Description The background on the face of the printed page is stained.

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

Check and Cause Solution

1. Toner leakage due to improperly sealed
developer.

2. If the transfer roller is contaminated, stains
on the face of page will occur.

1. Replace the developer cartridge.

2. If the transfer roller is contaminated, run
DRUM Cleaning Mode Print 2 or 3 times.
And perform Self-Test 2 or 3 times to
remove contamination.

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6.5.14 Stains on Back of Page

• Description The back of the page is stained at 47 mm intervals.

Digital
Digital Pri
Digital Printer
Digital Printer
Digital Printer

Check and Cause Solution

1. Transfer roller is contaminated.

2. Pressure roller is contaminated.

1. Perform the DRUM Cleaning Mode Print 2

or 3 times. Run Self-T est to remove the con­tamination of the transfer roller.

2. Replace the transfer roller if contaminated

severely .

3. Disassemble the fuser and clean the

H/R(Heat Roller) and P/R(Pressure roller).
And check the area between H/R and
Thermistor. If contaminated, clean the area
not to be deformed.

6.5.15 Blank Page Print out (1)

• Description Blank page is printed.

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

Check and Cause Solution

Bad ground contacts in OPC and/or devel­oper.

Remove contamination of the terminals of the
developer and the unit.

6.5.16 Blank Page Print out (2)

• Description

1. Blank page is printed.

2. One or several blank pages are printed.

3. When the printer turns on, several blank pages print.

Check and Cause Solution

1. Bad ground contacts in OPC and/or
developer.

2. Abnormal solenoid.

1. Remove contamination of the terminals of
the developer.

2. Perform the engine self test using Engine Test

Mode to check

if the Solenoid is normal.(refer

to code 06)

3. If not solved by the above directions 1-2,
Replace the engine board.

4. Turn the power off, delete the data of PC
and try printing again.

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6.6.1 No Dial Tone

• Description

There is no dial tone when the On-Hook dial button is pressed.

6.6 Fax & Phone Problems

Check and Cause Solution

1. Check that the telephone line cord supplied with
the set is connected to TEL LINE correctly.

2. Listen for a CLICK sound when the OHD key is
pressed.

3. Check the connection of the HARNESS between
the LIU and the Main B'd.

4. Check that the SPEAKER is connected correctly.

1. If the telephone cord is OK but there is no dial tone, try
plugging a normal telephone into the wall socket. If this
is OK then replace the LIU B'd.

2. If you cannot hear the OHD CLICK sound, the OPE
Ass'y may be defective. Replace the OPE Ass'y.
(If the key click sound if off, you cannot hear click
sound even if OPE Ass’y has no problem on it)

3. Check the Speaker connection and the harness
between the LIU and the Main PBA, replace as
necessary .

4. Use Tech mode / Modem Test to check that the
speaker and amplifier are working. Replace the Main B'd.

6.6.2 Defective MF DIAL

• Description

The MF DIAL is not functioning.

Check and Cause Solution

1. Check that the telephone line cord supplied with
the set is connected to TEL LINE correctly.

2. Listen for a CLICK sound when the KEY is
pressed.

3. Check the connection of the HARNESS between
the LIU and the Main B'd.

4. Check that the SPEAKER is connected correctly.

1. If the telephone cord is OK but there is no dial tone, try
plugging a normal telephone into the wall socket. If this
is OK then replace the LIU B'd.

2. If you cannot hear the OHD CLICK sound, the OPE
Ass'y may be defective. Replace the OPE Ass'y.
(After key click sound sets to “ON”, and you can hear
click sound)

3. Check the Speaker connection and the harness
between the LIU and the Main PBA, replace as
necessary .

4. Use Tech mode / Modem Test to check that the
speaker and amplifier are working. Replace the LIU
and Main B'd in sequence

Notes: Product supports MF DIAL type only.

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6.6.3 Defective FAX FORWARD/RECEIVE

• Description

FAX FORWARD/RECEIVE is not functioning.

Check and Cause Solution

1. Check that you can hear a dial tone by pressing
OHD.

2. Check that you can hear a RECEIVE tone when
MODEM testing in TECH Mode.

1. If MODEM testing is normal and there is no dial tone,
then try replacing the LIU B'd.

2. If testing the MODEM shows a fault replace the
Main B'd.

6.6.4 Defective FAX FORW ARD

• Description

RECEIVE is functioning, but FORWARD is not functioning or received data is corrupt.

Check and Cause Solution

1. Check if there is a NOISE line by pressing on-hook
dial and listening.

2. Check that the destination fax machine can receive
forwarded faxes by using a different sending fax
machine (preferably from the same wall socket).

3. Check the cable between the set and the wall
socket for damage.

1. If you can hear a noisy line when using on-hook dial,
replace or repair the telephone line

2. Replace LIU.

3. Replace the line cord.

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6.6.5 Defective FAX RECEIVE (1)

• Description

FORWARD is functioning, but RECEIVE is not functioning or the received data is corrupt.

Check and Cause Solution

1. Check if there is a NOISE line by pressing on-hook
dial and listening

2. Use a different fax machine to receive from the
same sender (if possible on the same wall socket).

1. If you can hear a noisy line when using on-hook dial,
replace or repair the telephone line.

2. Replace the LIU.

Check and Cause Solution

1. Check if there is a NOISE line by pressing on-hook
dial and listening

2. Ask sender to send to another fax machine
(if possible connected to the same wall socket)

1. If you can hear a noisy line when using on-hook dial,
replace or repair the telephone line

2. Replace LIU or main PBA in sequence.

Check and Cause Solution

Check that the RECEIVE Mode is set to FAX MODE. If the fault persists even when the RECEIVE Mode is

changed to FAX MODE then replace the LIU and the
Main B'd in sequence.

6.6.6 Defective FAX RECEIVE (2)

• Description

Received data are lengthened or cut in the printing.

6.6.7 Defective FAX RECEIVE (3)

• Description

The phone is ringing continuously, but it set does not answer the call.

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6.6.8 Defective FAX RECEIVE (4)

• Description

Received data is reduced by more than 50% in the printing.

6.6.9 Defective Automatic Receiving

• Description

The automatic receiving function is not working.

Check and Cause Solution

Check the FAX status of the forwarding side. This is a problem with the sending fax machine.

Correct the setting on the remote machine..

Check and Cause Solution

1. Check that the RECEIVE Mode is set to FAX
MODE.

1. If the RECEIVE Mode is set to the TEL MODE, reset it
to the FAX MODE.

2. Even after the RECEIVE Mode is changed to the FAX
Mode, the problem persists then try to replace the LIU
and the Main B'd in sequence.

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6.7.1 White Copy

• Description

Blank page is printed out when copying.

6.7 Copy Problems

6.7.2 Black Copy

• Description

Black page is printed out when Copying.

Check and Cause Solution

1. Check for CIS problem on the Main PBA.

2. Check shading profile.

1. Check the CIS FFC Cable is properly connected.

2. Redo shading profile in the tech mode.

Check and Cause Solution

1. Check the Scanner Cover is properly closed.

2. Check shading profile.

3. Check white/black reference voltage on Main PBA.

1. Room light can pass through a thin original.

2. Redo shading profile in the tech mode.

3. Replace the Main PBA.

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6.7.3 Abnormal noise

• Description There is noise from the ADF when copying.

Check and Cause Solution

1. Check the Scanner Motor, gearbox and rollers.

2. Check the Motor Driver on Driver PBA.

6.7.4 Defective Image Quality

• Description The copied image is excessively light or dark

Check and Cause Solution

1. Check shading profile.

2. Check the gap between original and scanner
glass.

3. Check printing quality.

1. Redo shading profile in the tech mode.

2. Agap of more than 0.5 mm can cause a blurred
image. Ensure rollers and cover close correctly.
Replace as necessary.

3. See "Print" troubleshooting.

1. Check for correct assembly of gears and motor.
Ensure no parts are fouling and there are no foreign
objects in the mechanism or scanner path. Replace
any worn parts

2. Replace the main PBA and ADF PBAin seguence.

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6.8 Scanning Problems – Causes and Solutions

6.8.1 PC Scanning problems

• Description Unable to scan using a PC.

Check and Cause Solution

1. Check the Cable (USB or Parallel) is properly
connected and that the printer can print correctly.

2. Check that the driver is installed properly.

3. Check that the copy function operates normally.

1. Reconnect the PC and printer, replace any faulty
cables. If using a parallel cable, check that the par­allel port is properly configured in the BIOS.

2. If printing is OK check that the Scan driver is also
installed (Refer to User's Manual.)

3. If the copy function works, replace the Main PBA.
If the copy function doesn't work, replace the CIS
Ass'y and try again.

6.8.2 Poor Quality of PC Scanned images

• Description The image PC scanned is not clear or bad.

Check and Cause Solution

1. Use TECH mode to carry out a shading test and
examine the waveform printout.

2. Check if the resolution is set too low in PC Scan
options. (Refer to User's Manual.)

1. If the CIS waveform form is abnormal replace the
CIS Ass'y .

2. Teach the user about scanner resolution – refer to
the User Guide.

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6.9 Toner Cartridge Service

Only toner cartridges supplied by Samsung should be used. Printing defects or set damage caused by the use of
non-approved toner cartridges or un-licensed toner refills are not covered by the guarantee.

6.9.1 Precautions on Safe-keeping of Toner Cartridge

Excessive exposure to direct light for more than a few minutes may cause damage to the cartridge.

6.9.2 Service for the Life of Toner Cartridge

If the printed image is light due to the toner supply becoming low you can temporarily improve the print quality by
redistributing the toner (Shake the toner cartridge), however you should replace the toner cartridge to solve the problem
permanently .

6.9.2.1 Redistributing Toner

When the toner cartridge is near the end of its life, white streaks or light print occurs. The LCD displays the warning mes­sage, “Toner Low.” You can temporarily reestablish the print quality by redistributing the remaining toner in the cartridge.

6.9.3 Standard of guarantee for consumable parts.

Please refer to User's Manual or Instructions on Fax/Printer Consumables SVC manual for the criteria for judging the
quality of consumable parts the standard of guarantee on those parts.

• Spotting a refilled cartridge by eye.

One way security screws are used in the manufacture of the cartridge – check if these are damaged.

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6.9.4 Error messages in the LCD window related to toner.

This section explains messages on the LCD that are related to the data stored in the EEPROM in the toner cartridge.

6.9.4.1 Toner Low

- Explanation: The amount of toner remaining is less than 10%

- Solution: The cartridge is almost empty or life-expired – replace the cartridge.

6.9.4.2 Toner Empty

- Explanation: The toner cartridge is empty

- Solution: Replace the cartridge.

6.9.4.3 Drum Warning

- Explanation: This message appears when the OPC drum is nearing the end of its life (14,000pages). This means
that the life of the mechanical parts in the cartridge has expired (this is not an indication of toner remaining).

- Solution: After printing about 15,000 pages, in a worst case scenario, the waste toner collector might overflow and it
may cause the system to fail. Also after 15,000 pages the OPC drum surface will be becoming worn and print quality
will degrade, print images will become misty. It is therefore necessary to replace the cartridge even though there may
be toner left in it.
When this message occurs there are approximately 1,000 pages left.

6.9.4.4 Replace Drum

- Explanation: The toner cartridge mechanical life is expired.

- Solution: Replace the cartridge.

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6.10 Software Problems – Causes and Solutions

6.10.1 The printer is not working (1)

• Description

While Power turned on, the printer is not working in the printing mode.

Check and Cause Solution

1. Run Self-Test Mode: using the menu buttons print the
test page.

2. Check that the PC and the printer are properly
connected and that the toner cartridge installed
correctly .

3. Printing is not working in the Windows.

4. Check that the printer cable is directly connected to the
printer.

1. If the test print works that means there are no
problems in the printer itself. If the test printing does
not work that means the printer is faulty and the
problem is not due to computer software or driver
settings.

2. Replace the printer cable. If the problem is not
solved even after the cable is replaced, check the
amount of the remaining toner. (refer to Toner
Cartridge Service 7-6, Page 7-25)

3. Check that the connection between PC and printer
port are correcct. If you use windows, check that the
printer driver in the controller is set up correctly set
up, the correct port is selected and ‘Use On-line’is
selected in the driver. If the printer driver is properly
set up try printing a test page from the driver proper­ties. Check in which program printing is not working.
Try opening ‘Note Pad’and printing. If the printer is
not working in a certain program, adjust the setup
within that program.
Sometimes, the printout is normal within the
Windows basic programs, but it's not working in a
particular program. In this case, uninstall and re­install the new driver. If the printer is not working in
the Windows basic programs and you are printing
using the parallel port check the port setting in
CMOS is on ECP and that the address is IRQ 7
and 378 (for parallel port 1). Try using USB instead
of parallel – or vice versa.

4. If you have other devices that need to share the
printer port try temporarily disconnecting these
devices and perhaps even uninstalling their drivers)
to ensure the printer works by itself. If you are using
a USB hub try connecting directly to the back of the
PC instead.

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6.10.2 The printer is not working (2)

• Description

After receiving the print command there is no response at all or print speed is low
due to wrong setup of the environment rather than malfunction of the printer itself.

Check and Cause Solution

1. Ensure you have sufficient free hard disk space for the
temporary work files created during printing.

2. Printing error occurs even if there is enough space in
the hard disk.

3. Check the parallel-port-related items in the CMOS
Setup.

4. Reboot the system to print.

1. Not working with the message 'insufficient printer
memory' means there is a hard disk space problem
rather than a printer RAM problem. In this case pro­vide more space on the hard disk. Secure more
space using the disk utilities program.

2. The connection of the cable and printer port is not
correct. Check that the cable is properly connected
and if you are using the parallel port check that the
port settings in CMOS is correct.

3. For the printer port, Select ECP. SPP and normal
normal modes support 8-bit data transfer, while
ECP Mode supports 12-bit data transfer.

4. If the regular font is not printing, the cable or the
printer driver may be defective.
Turn the PC and printer off, and reboot the system
to print again. If not solved, double-click the printer
in my computer If the regular fonts are not printed
this time again. the cable must be defective so
replace the cable with new one.

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6.10.3 Abnormal Printing

• Description

Printing does not work – even after replacing the cable
Printer does not work at all or strange fonts are printed,

Check and Cause Solution

1. Set up the parallel port using CMOS SETUP.

2. Printer Driver Error.

3. Error message “insufficient memory”.
(The printing job sometimes stops due to insufficient
virtual memory, this is caused by insufficient space on
the hard disk.)

1. Ensure that ECP (best) or SPP is selected in the
CMOS (BIOS) setup.

2. Ensure that the correct driver is loaded. Use the
driver supplied on the CD or downloaded from the
Samsung web site. DO NOT use the Microsoft
driver supplied with the Windows operating system.
If the printer is a GDI or SPL type printer ensure that
ALL OTHER GDI or SPL drivers are uninstalled as
Windows allows only 1 of this type of driver to be
loaded.

3. Delete any unnecessary files to secure enough
space on the hard disk and start the print job again.

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6.10.4 SPOOL Error

• Description

SPOOL (simultaneous peripheral operations online) is the process Windows uses to
manage print jobs. Jobs are processed and then stored on the hard disk until the printer is
ready to accept them

Check and Cause Solution

1. Insufficient space on the hard disk in the directory
assigned for the basic spool.

2. If previous printing errors were not solved.

3. There may be conflict with other drivers or programs.

4. When an application program or the printer driver is
damaged.

5. When some files related to the OS are damaged or
virus infected.

6. Memory is less than suggested.

1. Delete any unnecessary files to provide more space
for spool storage.

2. There may be files from previous failed print jobs on
the hard disk with the name in the form ‘*.jnl’.
Delete these files and Reboot Windows to restart
the printer.

3. Shut down all other programs except the current
one, if possible.

4. Delete the printer driver completely and reinstall it.

5 After rebooting the computer, check for viruses,

restore the damaged files and reinstall the
application program which is not working properly.

6. Add up more memory to the PC.

How to delete the data in the spool manager.

In the spool manager, the installed drivers and the list of the documents waiting to be printed are shown.
Select the document to be deleted and check delete in the menu.

If the job you are deleting is the current job when you delete the job data that has already been transferred to
the printer’s memory will still be printed. If there is a problem with the printer (out of toner, offline, out of paper
etc.) the job may take a long time to delete as it must wait for a time out.

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After installing PortThru the print server name
is not displayed under New Print Server in
SyncThru.

Problem Solution

1. Verify that the printer power switch is turned on and the 'READY'
message is displayed on the printer front panel.

2. Verify that the LAN cable is plugged into the PortThru card.

3. There are 2LEDs on the PortThru card. One should flash irregularly
and the other should be on. If this is not the case ensure that the
network card is properly installed and the PCB an cable connectors
make a good connection. If the problem continues check the network
cable / socket by using a different cable or socket. If the problem
continues replace the network card.

4. Confirm that the print server and the PC which searches for the
New Print Server is on the same LAN (correct IP and subnet
mask settings). If you want to search for a New Print Server your
PC and the print server should be on the same LAN.

The print server name is displayed, but the test
page is not printed.

Using the front panel menus print the Network configuration. If the
Network menu is not displayed or the configuration page is not
printed turn off the printer, ensure the network card is properly fitted
then turn it back on and try again. If the problem continues replace
the network card.

SyncThru indicates that firmware upgrade is
complete but when the network configuration
is printed the software version has not changed.

Before attempting to upgrade firmware ensure that computer and
printer can communicate using a Ping command.

SycThru is unable to automatically detect
the printer.

1. Check that the LAN cable is connected to the printers. If an IP
address is assigned to the computer and printer ensure that the
Ping command can see the printer.
If an IP address is not allocated to the printer or it is in a different
LAN segment then ensure that either IPX/SPX or DLC/LLC pro­tocols are enabled on the computer.

2. Print the network configuration. If the TCP/IP or Network proto­cols are disabled in the printer either use the front panel to re­enable them or ensure that DLC/LLC protocol is installed in the
computer.

3. In SyncThru use the Settings / Protocol Selection menu option to
select either TCP/IP or IPX protocols and then use the
View/Refresh option to scan the network again.

4. Ensure that the network cable and wall socket are functioning
correctly .

5. Ensure that the version of SyncThru is the same as or newer
than the version supplied with the printer.

6. Ensure that there is no router between the printer and the
computer as SyncThru will not work through a router.

7. Ensure there are no Switch or Router VLAN or Access Control
Lists which are blocking communication between the printer and
the computer.

Note Windows XP does not support DLC/LLC protocols.

The printer does not print via a
network connection.

1. Connect the printer using a Parallel or USB cable and ensure
that the computer can print. If not check that the printer drivers
are installed correctly

2. If the printer can print via a local connection check Printer
Properties / Ports and ensure that a TCP/Ip port has been allo­cated to the printer.

6.11

Windows Problems

Troubleshooting

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6.12 SyncThru Installation Problems

"File Transfer Error" message appears during
the Installation process.

Problem Solution

1. Make sure that any previously installed version of SyncThru is
uninstalled. Restart your PC after uninstalling previous versions.

2. If the problem continues, In Windows 95/98 boot into MS/DOS
mode and delete the "sammon.dll" file in the windows\system
directory the restart Windows and reinstall SyncThru. In Windows
NT stop the spooler service using' Services 'in Control Panel,
delete the "sammon.dll" file in the windows\system32 directory
then restart the spooler service and reinstall SyncThru.

'Unable to add the Port list of Samsung ports'
message appears when you add a port.

Verify that your PC restarts after installing SyncThru.