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.
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