HP LaserJet 3020 all-in-one vs. Samsung SCX-4100
Get more with the HP LaserJet 3020 all-in-one.
With HP youll spend less time waiting for output.

HP Samsung

print 10 print copy copy 37
faster output The HP LaserJet 3020 all-in-one employs patented Instant-on Technology which virtually eliminates warm-up time. As a result, the HP all-inone can warm up and print or copy up to 7 pages before the SCX-4100 can even warm up and print or copy a single page.1 more toner The HP LaserJet 3020 ships with enough toner to print up to
1,000 more pages than the Samsung SCX-4100 a value of over 26.2
enhanced productivity The HP LaserJet 3020 all-in-one sports an array
of convenient, time-saving features not available from Samsung, including:
automatic document feeder The HP LaserJet 3020s standard 50-sheet automatic document feeder (ADF) enables unattended copying and scanning of multi-page documents. No ADF is available on the Samsung SCX-4100. simultaneous multi-tasking The HP LaserJet 3020 all-in-one can scan documents while printing a file, and vice versa. Attempting to do so on the Samsung device results in an error message.3 scan-to buttons HP LaserJet 3020 all-in-one users can make scans quickly and easily at the device by simply pressing the scan-to button and choosing their destination. The Samsung SCX-4100, on the other hand, has no scan-to buttons, forcing users to launch software on their PC to begin the scanning process. scan multi-page documents to a single PDF HP lets users scan multi-page documents into a single, easy-to-use PDF file that is much simpler to manipulate and share than the multiple files created via the SCX-4100. direct scan to email HP users can scan documents directly from the LaserJet 3020 all-in-one to an email address.4 Scan to email with Samsung merely attaches the scanned document to a blank email message on their PC. Users must enter the recipients address and send the message manually.
time to warm up and print or copy a 1-page job in seconds

Get more toner with HP.2

2,000 1,500 1,000 500

1,000 2,000

To get the most value, be sure to look at the whole picture.
Purchase price is just part of the picture. In fact, independent studies have shown that quality, reliability, and ease of use have a much greater impact on the total cost of owning and operating a device over time. When choosing an all-in-one, be sure to consider how much it will impact productivity, as well as whether or not you can count on it to be up and available whenever you need it. And remember, HP is the only printer maker that has received top scores for 13 consecutive years in PC Magazines annual Service and Reliability Survey.
1In HP Internal tests, it took the Samsung SCX-seconds to print or copy a single page from powersave mode. The LaserJet 3020, on the other hand, prints a single page in 10 seconds from powersave mode or copies a single page in 12 seconds from powersave mode. Based on manufacturer-rated engine speeds it would then take the HP LaserJet 3020 all-in-one 36 seconds to print a 7-page document or 34 seconds to copy a 6-page document from powersave mode. 2Based

Samsung

amount of toner included with device at time of purchase in pages
on 5% coverage for each page, the HP LaserJet 3020 ships with enough toner to print up to 2,000 pages whereas the Samsung SCX-4100 only ships with enough toner to print up to 1,000 pages, according to manufacturers specifications. Based on data from Context PriceWatch Consumables June 2005 (average price in Euros including VAT, all countries, all channels), the toner for 1,000 Samsung SCX-4100 pages costs 26.58.
HP Internal testing, the SCX-4100 produced a Port in use error when attempting to scan and print at the same time.

4Direct

scan-to-email functionality on the HP LaserJet 3020 requires pre-configuration through HP Toolbox software.
2005 Hewlett-Packard Development Company, L.P.

4.2.4.4 Pressure roller

The Pressure Roller mounted under the heat roller, it is made of a silicon resin, and the surface of the roller is tubed with Teflon. This ensures that toner does not adhere to the roller surface.
4.2.4.5 Safety Relevant Facts
To prevent overheating - 1st protection device: Hardware cuts off when overheated - 2nd protection device: Software cuts off when overheated - 3rd protection device: Thermostat cuts off mains power to the lamp. Safety device - Fuser power is cut off when the front cover is opened - LSU power is cut off when the front cover is opened - The temperature of the fuser cover's surface is maintained at less than 80C to protect the user and a caution label is attached where the customer can see it easily when the rear cover is opened.

4.2.5 Scanner Unit

Scan Image Controller
1.Scan Line Time : 1.67ms 2.Scan Resolution : Color : Max 600DPI 3.Scan Width : 216mm 4.Function - White Shading Correction - Gamma Correction - CIS Interface - 256 Gray Scale

CIS Driver Circuit

- CIS Clock : 4.16MHz - Voltage Reference : 1.1V - CIS Line Time : 1.67ms/Line x 3Color(600dpi)
Scan Motor Driver Circuit
- Motor Driver : SIA403A - Used Volt : 24V DC
4.2.6 LSU (Laser Scanner Unit)
This is the core of the laser printer. It converts the video data received from the computer into an electrostatic latent image on the surface of the OPC drum. This is achieved by controlling the laser beam and exposing the surface of the OPC drum to the laser light. A rotating polygon mirror reflects the laser light onto the OPC and each side of the mirror is one scan line. The OPC drum turns as the paper feeds to scan the image down the page. The /HSYNC signal is created when the laser beam from LSU reaches the end of the polygon mirror and this signal is sent to the controller. The controller detects the /HSYNC signal to adjust the vertical line of the image on paper. In other words after the /HSYNC signal is detected the image data is sent to the LSU to adjust the left margin on the paper.

4.2.7 Toner Cartridge

The toner cartridge is an integral unit containing the OPC unit and toner unit. The OPC unit consists of the OPC drum and charging roller, and the toner cartridge unit consists of the toner, supply roller, developing roller, and blade (Doctor blade) - Developing Method: Non magnetic 1 element contacting method - Toner: Non magnetic 1 element shatter type toner - The life span of toner: 3,000 sheets (IDC Pattern/A4 standard) - Toner remaining amount detecting sensor: No - OPC Cleaning: Electrostatic process - Management of waste toner: Electro static process(Cleanerless Type) - OPC Drum protecting Shutter: No - Classifying device for toner cartridge: ID is classified by interruption of the frame channel

0.22mW -330V

4.3 Main PBA
The Engine Board and Controller Board have been integrated into a single PBA. This consists of the CPU, printer scanner and line control functions. The CPU functions as the bus controller, I/O handler, motor driver and PC inter-face. The main board sends the Current Image Video data to the LSU and manages the Electrophotographic printing process. Circuits on the PBA drive include the main motor (paper feed, cartridge, fuser), clutch driver, pre-transfer lamp driver, heat-lamp driver, CIS driver, scan motor driver and fan driver. The signals from the paper feed jam sensor and paper empty sensor are inputted to the main board from the power supply PBA.

FLASH MEMORY (U69)

REGULATOR (3.3V) (U3)

SDRAM (U7)

GRAPHIC PROCESSOR ASIC (U5)

REGULATOR (1.8V) (U2)

TRANSCEIVER (U9)

SUPER 1284 (U11)

COMPARATOR (U16) Service Manual

CRYSTAL (OSC2)

EMI ATTENUATOR (U13)

MOTOR DRIVER (U15)

Samsung Electronics

4.3.1 ASIC (Chorus2)

The Chorus2 (16Bit RISC Processor) ASIC is the main processor controlling the whole system. It controls all of the printing and scanning functions using a system program stored in flash memory.

Main function block

Completely Integrated System for Embedded Applications, 16/32 Bit Risc Architecture, Efficient and Powerful ARM7TDMI CPU LSU Interface Module for Interfacing PVC with LSU 5 Channel General Purpose DMA Controller for High Speed I/O Dual Memory Bus Architecture Operating frequency : 66MHz Operating power : 1.8V(internal), 3.3V(external)

4.3.2 Flash Memory

This stores the system program. Firmware upgrade is achieved by downloading from the new image using the PC Interface. Capacity : 1M Byte Access Time : 70 nsec

4.3.3 SDRAM

This is used as a buffer, system working memory area, etc. while printing and scanning. Capacity : SCX-M byte Access Time : 15 nsec
4.3.4 Sensor input circuit

1) Paper Empty Sensing

The Paper Empty sensor (Photo Interrupter) on the SMPS/HVPS PBA is monitored by the CPU. When the cassette is empty the printer displays a message on the LCD panel.

6) OPC Ground ZENER Voltage
- Function: It is this voltage that prevents image contamination under low temperature and low humidity environment conditions. - When a set prints without an output voltage, -130V DC 15V is maintained on OPC ground. (-130V ZENER diode is connected to OPC ground) - Error type: a) When the ZENER diode is - 0V there is no serious image problem in general environment, but in low temperature and low humidity environments it is possible that contamination can occur on the entire image b) When the ZENER diode is disconnected a blank page is printed out. (It is the same when a ZENER diode is disconnected from OPC ground.)
4.4.2 SMPS (Switching Mode Power Supply)
This is the power source for the whole system. It is an independent module so that it is possible to use it for common use. It is mounted at the bottom of the set. It consists of the SMPS section, which supplies the DC power to drive the system, and the AC heater control part, which supplies the power to the fuser. The SMPS has four output channels (+5V, +3.3V, +3.3VS and +24VS). There are three kinds of power, 120V exclusive (America), 220V exclusive (Europe), and 220V for China (nations with unstable power supply).

1) AC Input

- Inputting rated voltage : AC 220V ~ 240V AC 100~127V - Inputting voltage fluctuating range : AC 198V ~ 264V AC 90V ~ 135V - Rated frequency : 50/60 Hz - Frequency fluctuating range : 47 ~ 63 Hz - Inputting Current : Under 4.0Arms/2.0Arms (when heat lamp is off)

2) Rated Power Output

NO Item Channel name Connector Pin CH1 +5V CON 4 5V PIN: 3, 4, 23 GND PIN: 5, 6 +5V 5% (4.75 ~ 5.25V) 1.0 A 1.5 A Under 150m Vp-p 5.0W CH2 +24V CON 4 24V PIN : 14 GND PIN: 8, 9, 10 +24V - 10/15% (21.6 ~ 27.46V) 0.5A 1.0A Under 500m Vp-p 12W CH3 +24.0VS CON 4 24V PIN: 11, 12 GND : 8, 9, 10 +24VS - 10/15% (21.6 ~ 27.46V) 1.0 A 1.5 A Under 500m Vp-p 24W Remark
Rated Output Voltage Max. Output current Peak Loading voltage Ripple noise voltage Maximum output

3) Consumption Power

NO 3 Item Stand-By PRINTING Sleep-Mode CH1 (+5V) 0.2 A 1.0 A 0.2A CH2 (+24V) 0.07A 0.5A 0.02A CH3 (+24VS) 0.07 A 1.0 A 0.03A System AVG : 60 Wh AVG : 300 Wh AVG : 10 Wh
4) Length of Power Cord : 1830 50mm 5) Power Switch : Fitted

Feed Bracket

Guide Paper
5. Remove the Idle Gear and Feed Gear2.

Feed Gear2

3. Pull up the Feed Idle Bush and Feed Idle Shaft, as shown below.

Feed Idle Shaft Bush

6. Remove the Feed Gear 1 Assy, as shown below.

Feed Gear1 Assy

7. Remove the Feed Roller and Feed Roller1, as shown below.

Feed Roller

Feed Roller1
5.16 Pick Up Roller & Solenoid
1. Before you remove the Pick Up Roller and Solenoid you should remove: - Rear Cover (see page 5-2) - Side Covers (see page 5-3) - Scanner Assy (see page 5-4) - Middle Cover (see page 5-6) - LSU (see page 5-9) - Drive Assy (see page 5-10) - Feed Bracket and Gears (See page 5-14 steps 4 - 6) 2. Remove the Pick up Gear Assy, as shown below. 4. Remove 2 screws then remove the Regi Solenoid and Pick Up Solenoid.
(Pick up) Solenoid (Regi) Solenoid

Pick up Gear Assy

3. Remove the Pick up Assy, as shown below.

Pick up Assy

Alignment & Adjustments
6. Alignment and Adjustments
This chapter describes some of the main service procedures including: Using the EDC mode; Clearing paper jam and test patterns. Much of this chapter is also included in the user's guide.

6.1 Engine Test Mode

The Engine Tests Mode supplies useful functions to check the condition of the engine. It tests the condition of each device and displays the result of the test on the LCD. It is classified into 5 functions (0~4), and are shown below.
6.1.1 To enter the Engine Test Mode
To enter the Engine Test mode
Menu/Exit Darkness Menu/Exit
in sequence, and the LCD briefly displays
'Engine Test [Diagnostic]', the machine has entered Engine Test Mode. To enter a lower menu (Sub menu) Press the Start/Enter key. To exit into an upper menu Press the Menu/Exit key. To return to the user menu Press the Menu/Exit key.

6.1.2 Diagnostic

Main Menu ENGINE TEST MTR FAN SOL ETC Engine test Motor Test PickUp Test Fan Test Manual Clt Test PTL Test LSU Motor Test LSU Hsync Test LD Test Feed Sen Test Exit Sen Test Cover Sen Test Empty Sen Test Manual Sen Text ENGINE TEST HEAT TEST ENGINE TEST HVPS TEST Therm ADC 220~85 MHV Test Dev Bias Test THV EN/NEG Test THV ON (1300V) THV ADC 1300V THV ADC 600V~3550V Remark 1 : On, 2 : Off 1 : On, 2 : Off 1 : On, 2 : Off 1 : On, 2 : Off 1 : On, 2 : Off 1 : On, 2 : Off 1 : On, 2 : Off 1 : On, 2 : Off Check : Check Start Next : Next Sensor Check Check : Check Start Next : Next Sensor Check Check : Check Start Next : Next Sensor Check Check : Check Start Next : Next Sensor Check Check : Check Start Next : Next Sensor Check 1 : On, 2 : Off (maintain the fusing temp. 65C~230C) 1 : On, 2 : Off (-1550V 50V) 1 : On, 2 : Off (-430V 20V) 1 : On, 2 : Off (-1000V +300V/-150V) 1 : On, 2 : Off (+1300V 20V) 1 : On, 2 : Off 1 : On, 2 : Off (Compare each ADC Value)

6.3.2 In the Paper Exit Area
1 Open and close the front cover. The jammed paper is automatically ejected from the machine. If the paper is not ejected continue to step 2. 2 Gently pull the paper out of the front output tray. Skip to step 9. If you cannot see the jammed paper in the front output tray, continue to step 3. 3 Open the jam cover by lifting the front edge of the scanner unit. The support lever will automatically pop up. 6 Open the rear cover. 7 Remove the jammed paper by gently pulling it straight out.
8 Close the rear cover. 9 Open and close the front cover to resume printing.
4 Pull the paper out gently.
5 Close the jam cover by pushing the support tab to the left and hold it down whilst lowering the cover carefully until the cover fully down, this will hold down the tab. If there is any resistance and the paper does not move when you pull or if you cannot see the paper in the jam cover, continue to step 6.
6.3.3 In the Fuser Area or Around the Toner Cartridge
NOTE: The fuser area is hot. Take care when removing paper from the machine. 1 Open the front cover and lightly push down on the cartridge then pull to take it out. 2 Remove the jammed paper by gently pulling it straight out.
3 Replace the toner cartridge and close the front cover. Printing automatically resumes.
6.3.4 In the Manual Feeder
Bypass Jam appears on the display when you try to print using the manual feeder and the machine does not detect paper, due to no paper or improper paper loading. The error message may also occur when the paper is not properly fed into the machine through the manual feeder. In that case, pull the paper out of the machine.
6.4 Printing the System Data List
Your machine can print the system data report which shows the status of the user-selectable options. You may print this list to confirm your changes after changing any settings. To print the system data list: 1 Press Menu/Exit until "Report" appears on the top line of the display. "System Data" appears on the bottom line. 2 Press Start/Enter. The system data list prints out.

6.5 Clearing the Memory

You can selectively clear information stored in your machines memory. 1 Press Menu/Exit on the control panel until "Maintenance" appears on the top line of the display. 2 Press the scroll button ( < or > ) until you see "Clear Settings" on the bottom line and press Start/Enter. The first available menu item, Paper Setting displays on the bottom line. 3 Press the scroll button ( < or > ) until you see the item you want to clear. Paper Setting: Restores all of the Paper Setting options to the factory default. Copy Setup: Restores all of the Copy Setup options to the factory default. All Settings: Resets all of your settings to the factory default. Machine Setup: Resets all of the system settings, such as the display language and save modes, to the factory default. 4 Press Start/Enter. The selected memory is cleared and the display asks you to continue clearing the next item. 5 To clear another item, press Start/Enter and repeat steps 3 and 4. Or, to return to Standby mode, press Stop/Clear.

Paper Jam 2 Check Inside

Clear the jam.
6.9 Periodic Defective Image
If a mark or other printing defect occurs at regular intervals down the page it may be caused by a damaged or contaminated roller. Measure the repetition interval and refer to the table below to identify the roller concerned. No

Roller

OPC Drum Charge Roller Supply Roller Developing Roller Transfer Roller Heat Roller Pressure Roller

Defective image

75.5mm 37.7mm 47.8mm 35.2mm 45.3mm 57.1mm 59.7mm

Typical defect

white spot on black image or black spot black spot light or dark horizontal image band horizontal image band image ghost Black spot and image ghost black spot on the backside
OPC Drum Charge Roller Supply Roller Developing Roller
Tramsfer Roller Heat Roller Pressure Roller

<Rollers Layout>

Troubleshooting

7. Troubleshooting

7.1 Printing Problems Causes and Solutions
7.1.1 Vertical Black Lines and Bands
Description 1. Straight thin black vertical lines occur in the printing. 2. Dark black vertical bands occur in the printing. Check and Cause Solution 1. Replace the toner cartridge and test again.
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
1. Damaged developer roller, deformed Doctor-blade or cleaning-blade in the Toner cartridge. 2. Scratched surface of the charge roller in the toner cartridge. 3. 3. Depression or deformation of the surface of the transfer roller.
2. Replace the toner cartridge and test again. 3. Replace the transfer roller and test again.
7.1.2 Vertical White Line
Description White vertical voids in the image.

Check and Cause

Solution 1. Clean the LSU window with recommended cleaner (IPA) Clean the window with a clean cotton swab. If dirt is inside the LSU replace LSU. 2. Replace the toner cartridge.
1. 1. Contamination of the window or internal lenses of LSU mirror.
2. Foreign object inside the toner cartridge or low toner. 3. Foreign object, contamination or burr on the edge of the toner cartridge window. 4. If the fuser is defective, voids occur periodically at the top of a black image.
3. Clean the exposure window.
4. Open the front cover and check the ribs that correspond to the position of the voids. Remove if found. 5. If the problems are not solved, replace the toner cartridge. 6. Replace the transfer roller.
5. Contamination of the OPC drum.
6. Depression or deformation of the surface of the transfer roller
7.1.3 Horizontal Black Bands
Description 1. Dark or blurry horizontal stripes occur in the printing periodically. (These may occur at regular intervals down the page.) Check and Cause Solution 1. Clean all HV terminals on the cartridge and on the set frame. Ensure all toner or paper dust particles are removed. 2. Clean the right Gear that has relatively small tooth gap on the OPC.

1. Bad contacts on the toner cartridge high voltage terminals.
2. The rollers in the toner cartridge may be contaminated. Charge roller = 37.7 mm Supply roller = 47.8 mm Develop roller = 35.2 mm Transfer roller = 45.3 mm
3. If the problem persists replace the toner cartridge.

7.1.4 Black/White Spot

Description 1. Dark or blurry black spots occur periodically in the printing. 2. White spots occur periodically in the printing. Check and Cause 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. Solution 1. Print several OPC cleaning Mode Prints and then run the Self-test 2 or 3 times.
2. 75.5 mm repetition: Examine the surface of the OPC drum and carefully clean with a soft, lint free cloth. If unsuccessful replace the cartridge. 37.7mm repetition: Replace the toner cartridge
3. If a black image is partially broken, the transfer voltage is abnormal or the transfer roller's life has expired.
3. The transfer roller guarantees 60,000 sheets printing. If the roller's life is expired, replace it. Note. Cleaning the inside of the set to remove excess toner particles or paper dust will reduce the occurrence of this problem.

7.1.5 Light Image

Description The printed image is light, with no ghost.
Solution 1. Ensure the Toner Save mode is off. Check set and driver settings. 2. Replace the toner cartridge and try to print out again. 3. Wait 30 minutes after printer is powered on before you start printing. 4. Clean the cartridge and set contacts. Generally clean dirt from inside the set. 5. Replace the HVPS if the problems are not solved by the above four instructions.
1. Toner Save mode enabled
2. Develop roller is contaminated or the toner cartridge is almost empty. 3. Ambient temperature is below than 10C.
4. Bad contact caused by dirty terminals on the toner cartridge or set. 5. Abnormal output from the HVPS. (Run EDC mode see sections 6.1.2 and 6.1.3)
7.1.6 Dark Image or a Black
Description The printed image is dark.
Solution 1. Check the state of the connector which connects the engine board and HVPS. 2. Clean the high voltage charge terminals. Note if 1 and 2 do not resolve the problem and the problem persists replace the HVPS. 3. Replace the LSU Unit or Main PBA.
1. No charge voltage in the engine board.
2. Charge voltage fault due to bad contact between toner cartridge and set contacts.
3. VD0 signal of the Main PBA is Low state.

7.1.7 Uneven Density

Description Print density is uneven between left and right.
Check and Cause 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 holders are damaged. 2. The life of the Toner cartridge has expired. 3. The toner level is not even on the toner cartridge roller due to the damaged blade or low toner.

7.1.15 Blank Page Print out (1)
Description Blank page is printed.
Check and Cause Bad ground contacts in OPC and/or toner cartridge.
Solution 1. Check if the Ground-OPC or the OPC Ground Zener diode are defective or open circuit. (set inside left side). 2. Remove contamination of the terminals on the toner cartridge and the unit.
7.1.16 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 1. Abnormal solenoid. Solution 1. Perform the engine self test using TECH Mode to check if the Solenoid is normal. If the problem persists replace the main PBA

7.2 Copy Problems

7.2.1 White Copy
Description Blank page is printed out when copying. Check and Cause 1. Check the Scanner Cover is properly closed. 2. Check shading profile. 3. Check white/black reference voltage on Main PBA. e.q CIS_SI, CIS_CLK at CN7 Or Check the FFC Solution 1. Room light can pass through a thin original. 2. Redo shading profile in the tech mode. 3. Replace CN7 if it is defective. CN7-Pin6(CIS-SI) CN7-Pin7(CIS-CLK)

7.2.2 Black Copy

Description Black page is printed out when Copying.
Check and Cause 1. Check for CIS problem on the Main PBA. 2. Check shading profile.
Solution 1. Check the CIS harness is properly connected. 2. Redo shading profile in the tech mode.

7.2.3 Abnormal noise

Description There is noise from the ADF when copying. Check and Cause 1. Check the Scanner Motor, gearbox and rollers. Solution 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.
2. Check the Motor Driver on Driver PBA.
7.2.4 Defective Image Quality
Description The copied image is excessively light or dark Check and Cause 1. Check shading profile. 2. Check the gap between original and scanner glass. Solution 1. Redo shading profile in the tech mode. 2. A gap of more than 0.5 mm can cause a blurred image. Ensure rollers and cover close correctly. Replace as necessary. 3. See "Print" troubleshooting.

3. Check printing quality.
7.3 Paper Feed problems Causes and Solutions
7.3.1 Wrong Print Position
Printing begins at wrong position on the paper.

Description

Check and Cause Wrong sensor timing caused by defective feed sensor actuator.
Solution Replace the defective actuator

7.3.2 JAM 0

Description 1. Paper does not exit from the cassette. 2. Jam-0 occurs when the paper feeds into the printer. Check and Cause

L S U Fuser

Solution 1. Replace the solenoid.
1. Check the Solenoid by using Tech Mode. 2. Check cassette/MP knock-up plate and springs. 3. Check paper separator pad
2. Repair / replace as required
3 Clean with soft cloth dampened with IPA (Isopropyl Alcohol) or water. Replace if required. 4. Clean with soft cloth dampened with IPA (Isopropyl Alcohol) or water. Replace if required 5. Ensure all rollers are clean and free to operate correctly.
4. Check the pick up roller for contamination and correct assembly.
5. If continuous clusters occur, check all rollers between pickup and registration sensor. 6 If the paper feeds into the printer and Jam 0 occurs, perform Tech Mode to check feed sensor.
6. Check the SMPS PBA, Main PBA and all connections. Replace any faulty parts or the

7.3.3 JAM 1

Description 1. Paper is jammed in front of or inside the fuser. 2. Paper is stuck in the exit roller and in the fuser just after passing through the Actuator-Feed. Check and Cause
Solution 1. Replace the Exit-Sensor, SMPS or main PBA. 2. Reassemble the Actuator-Feed and Spring-Actuator if the movement is bad. Replace if necessary.
1. If the recording paper is jammed in front of or inside the fuser. 2. If the recording paper is stuck in the exit roller and the fuser just after passing through the Actuator-Feed, Feed Actuator may be defective.

7.3.4 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. Check and Cause
Solution 1. Check if the exit sensor actuator is defective. Check if the actuator exit is deformed (Check if the lever part is deformed). Check whether burrs occur in the assembly part of the exit actuator and if the actuator operates smoothly. Check if foreign objects or paper debris are preventing the correct operation of the actuator. 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. Check all ribs, claws and springs.

1. If the paper is completely fed out of the printer, but Jam 2 occurs: The Exit sensor may be defective. After the paper is completely discharged the Exit sensor actuator should return to its original position to shut the photo-sensor. It may stick open or return only slowly due to contamination be paper debris or foreign objects. 2. If the paper is rolled in the Fuser Roller: This occurs when a Guide claw is broken away, damaged or deformed. It occurs when the Spring of a Guide claw is broken or damaged. It occurs when the Heat-Roller or Pressure-Roller is seriously contaminated with toner.

7.3.5 Multi-Feeding

Description Multiple sheets of paper are fed at once.
Check and Cause 1. Check that the paper size guides are set correctly (cassette and MPF tray). 2. Solenoid malfunction (the solenoid does not work properly). 3. Friction Pad is contaminated.
Solution 1. Adjust paper guides.
2. Replace the solenoids or PBA as appropriate.
3. Clean the friction pad rubber with a soft cloth dampened with IPA (Isopropyl Alcohol) or water. 4. Use paper with a smother surface finish.
4. Paper has a rough surface texture.
7.3.6 Paper rolled in the fuser
Description Paper rolled around fuser rollers or Concertina jam
Check and Cause 1. Contamination of the pressure roller or heat roller.
Solution 1. After disassembling the fuser, clean contamination from between the heat roller and the thermistor and also clean contamination from the pressure roller. Clean the surface of the rollers with IPA or water 2. Check for damage or deformation of the print claws and the holder plate claws, and repair or replace as appropriate.
2. Damaged or deformed ribs, claws or springs.
7.3.7 Paper rolled on the OPC Drum
Description Paper is rolled up in the OPC.
Check and Cause 1. Paper is too thin. 2. The face of paper is curled.
Solution 1. Use paper that conforms to the printer specification. 2. Ensure paper is stored properly to prevent curl. Note. To remove paper rolled in the OPC. Remove the toner cartridge from the set, taking care not to touch the green surface. Use the gearwheel at the side to rotate the OPC drum and pull the paper from the cassette. Clean fingerprints on the OPC gently with soft tissue, taking care not to scratch the surface.
7.4 Printer Faults Causes and Solutions

7.4.1 Fuser Error

Description A message "Open Heat Error/Over heat/Heating Error' is displayed in the LCD panel.
Check and Cause 1. Thermostat, fuser power cable or heat lamp is open circuit. 2. Thermistor is open circuit.
Solution 1. Replace the whole fuser assembly if the thermostat is open circuit. 2. Replace the whole fuser assembly if the thermistor sensor is faulty. 3. Replace the fuser.
3. Heat lamp ON/OFF test 4. Drive gear melted

Cause & Check 1. If light or dark black dots occur at regular intervals this is because the toner cartridge rollers are contaminated with foreign substance or paper particles. (1)38mm interval : Charge roller (2)95mm interval : OPC cycle 2. If white spots occur in a black image at intervals of 95mm, or black spots occur elsewhere, the OPC drum is damaged or foreign substance is stuck to the surface. 3. If a black and white or graphic image is partially broken at irregular intervals, the transfer roller's life has been expired or the transfer voltage is abnormal.
Solution 1. For item 1 Run OPC Cleaning Mode Print 4-5 times repeatedly to remove excess toner. Especially check for foreign substances on the OPC surface Clean with a clean gauze moistened with IPA Isopropyl Alcohol) take care not to damage the OPC surface. Never use other forms of alcohol. 2. For Item 2 If running OPC Cleaning Mode Print 4-5 times does not resolve the problem : at intervals of 37.7mm - place the toner cartridge. : at intervals of 75.5mm clean OPC drum. 3. For item 3 - Change the transfer roller because the life of the transfer roller has expired. (Check the transfer voltage and readjust if necessary.)

Recycled product

Poor appearance of 1. Poor appearance of the toner the toner cartridge. cartridge. (a)Check for damage to label Dirty or rough and if different materials are printouts. used. (b)Check the appearance of Bad background in parts of the toner cartridge, the image. such as frame, hopper, screws
1. For Item 1 the cartridge is judged to be a recycled product (a) If there is any evidence of disassembling the toner cartridge. (b) If materials other than normal parts of the toner cartridge are added or substituted. 2. Clean all HV contacts. If the problem persists replace the cartridge. Note If the cartridge is judged to be recycled then these types of problems can occur when the toner cartridge is recycled over 2 times. If nearly empty cartridges are collected for re-use this is judged as recycling the toner cartridge.
2. Unclean and rough printouts. (a)Check that the terminals (contact point) of the toner cartridge and the set are clean. (b)Check that the terminals (contact point) of the toner cartridge and the set are not damaged.

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

7.6.3 Abnormal Printing

Printing does not work even after replacing the cable Printer does not work at all or strange fonts are printed,
Check and Cause 1. Set up the parallel port using CMOS SETUP.
Solution 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.

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.)

7.6.4 SPOOL Error