Samsung ML-2851ND/SEE Service Manual
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Samsung ML-2851ND/SEE Service Manual

Digital laser printer
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SERVICE
DIGITAL LASER PRINTER
ML-2850D
DIGITAL LASER PRINTER
ML-2850 Series
ML-2850D / ML-2851ND
ML-2851ND/SEE
Basic Model : ML-2851ND
Manual
The keynote of Product
Smallest Duplex Built-in
Mono Laser Printer
- 28ppm(A4) / 30ppm(Ltr)
- PCL6, PS3, 1,200x1,200dpi
- 400MHz processor
- USB 2.0, N/W (ML-2851ND only)
- 32MB (Max.160MB : factory option)
- 2K Standard, 5K High Yield
- Paper Input: 250 sh CST + 1 sh MP
- Standard Duplex Printing
- Options: 250 sh SCF
(Low Noise)

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Summary of Contents for Samsung ML-2851ND/SEE

  • Page 1 DIGITAL LASER PRINTER ML-2850 Series ML-2850D / ML-2851ND ML-2851ND/SEE Basic Model : ML-2851ND SERVICE Manual DIGITAL LASER PRINTER The keynote of Product Smallest Duplex Built-in Mono Laser Printer (Low Noise) - 28ppm(A4) / 30ppm(Ltr) - PCL6, PS3, 1,200x1,200dpi - 400MHz processor - USB 2.0, N/W (ML-2851ND only)
  • Page 2 GSPN (Global Service Partner Network) North America : service.samsungportal.com Latin America : latin.samsungportal.com CIS : cis.samsungportal.com Europe : europe.samsungportal.com Samsung Electronics Co.,Ltd. Aug. 2007 China : china.samsungportal.com Printed in Korea. Asia : asia.samsungportal.com VERSION NO. : 1.00 CODE : 2851-D0SEE...

  • Page 3: Table Of Contents

    Contents 1. Precautions 1.1 Safety Warning 1.2 Caution for safety 1.3 ESD Precautions 2. Product spec and feature 2.1 Product Specifications 2.1.1 Product Overview 2.1.2 Specifications 2.1.3 Model Comparison Table 2.2 Summary of Product 2.2.1 Printer Components 2.2.2 System Layout 2-12 2.2.3 Engine H/W Specifications 2-17...
  • Page 4 Continued 3.9 Transfer Roller 3-11 4. Alignment & Troubleshooting 4.1 Alignment and Adjustments 4.1.1 Sample Pattern 4.1.2 Control Panel 4.1.3 Consumables and Replacement Parts 4.1.4 LED Status Error Message 4.1.5 Abnormal Image Printing and Defective Roller 4.1.6 How to use DCU 4.1.7 Paper Jam 4-15 4.1.8 Download &...
  • Page 5 Continued 5.9 Fuser 5-21 5.10 Duplex Unit 5-23 5.11 Cassette 5-25 5.12 SCF 5-27 6. System Diagram 6.1 Block Diagram 6.2 Connection Dia ram 7. Reference Information 7.1 Tool for Troubleshooting 7.2 Acronyms and Abbreviations 7.3 Select a location for the printer 7.4 Sample Tests Patterns 7.5 LAN (Optional Function) 7.6 Information of model's code...

  • Page 6: Precautions

    High voltages and lasers inside this product are dangerous. This printer should only be serviced by a suitably trained and qualified service engineer. (2) Use only Samsung replacement parts There are no user serviceable parts inside the printer. Do not make any unauthorized changes or additions to the printer, these could cause the printer to malfunction and create electric shock or fire hazards.

  • Page 7: Caution For Safety

    Take care not to cut or damage the power cable or plugs when moving the machine. (9) Use caution during thunder or lightening storms. Samsung recommends that this machine be disconnected from the power source when such weather conditions are expected. Do not touch the machine or the power cord if it is still connected to the wall socket in these weather conditions.
  • Page 8 1.2.4 Assembly / Disassembly Precautions Replace parts carefully, always use Samsung parts. Take care to note the exact location of parts and also cable routing before dismantling any part of the machine. Ensure all parts and cables are replaced correctly.
  • Page 9 Failure to do so could cause the printer to tip or fall possibly causing personal injury or damaging the printer. (5) Do not install the printer on a sloping or unstable surface. After installation, double check that the printer is stable. Service Manual Samsung Electronics...

  • Page 10: Esd Precautions

    9. Minimize bodily motions when handling unpackaged replacement ESDs. Normal motions, such as the brushing together of clothing fabric and lifting one’s foot from a carpeted floor, can generate static electricity sufficient to damage an ESD. Service Manual Samsung Electronics...

  • Page 11: Product Spec And Feature

    15 sec FPOT From Ready 8.5 sec 8.5 sec From Sleep less than 23.5 sec less than 23.5 sec Resolution Up to 1,200 x 1,200 dpi effective output Up to 1,200 x 1,200 dpi effective output Service Manual Samsung Electronics...
  • Page 12 Product spec and feature 2.1.2.2 Controller & S/W ITEM ML-2850D ML-2851ND Processor Samsung 400 MHz Samsung 400 MHz Memory Std. 32 MB 32 MB Max. 160MB(option) 160MB(option) Printer Languages PostScript3, PCL6, SPL, IBM ProPrinter, PostScript3, PCL6, SPL, IBM ProPrinter, EPSON...
  • Page 13 20~24lb (75 to 90g/ ) Printable Area Non-Printable Area Envelope 10mm(0.4") from edge(Top, Bottom, Left, 10mm(0.4") from edge(Top, Bottom, Left, Right) Right) Other Media 4mm(0.16") from edge(Top, Bottom, Left, 4mm(0.16") from edge(Top, Bottom, Left, Right) Right) Service Manual Samsung Electronics...
  • Page 14 (Conformity to EPA) Dimension 364 x 369 x 209.6 mm 364 x 369 x 209.6 mm (W x D x H) (14.33" x 14.523" x 8.25 ") (14.33" x 14.523" x 8.25 ") Weight 7.87 Kg 7.87 Kg Service Manual Samsung Electronics...
  • Page 15 Standard Paper : 1/2.5K Stress Paper : 1/1500 Stress Paper : 1/1500 Speed Be equal or better than E250DN Be equal or better than E250DN Resolution Be equal or better than E250DN Be equal or better than E250DN Service Manual Samsung Electronics...
  • Page 16 Product spec and feature 2.1.2.10 Reliability & Service * Periodic Replacing Parts Parts Parts Code Code Fig. Fig. Yield (pages) Yield (pages) Transfer Roller JC66-01218A 50,000 Pick -up Roller JC97-03062A 50,000 JC96-04717A(220V) Fuser Unit 50,000 JC96-04718A(110V) Service Manual Samsung Electronics...

  • Page 17: Model Comparison Table

    FPOT (C/M) 30 sec/8.5 sec 50 sec/10 sec Noise 50 dBA 51 dBA Toner 2K/5K 3K/5K Dim. (WDH) 364 x 369 x 209.6mm 358 x 452 x 278mm Options 250 SCF, Memory (factory option) 250 SCF, Memory Service Manual Samsung Electronics...
  • Page 18 50 dBA 47 dBA Toner 2K/5K 2K/2.5K 1K/2K Dim. (WDH) 364 x 369 x 209.6mm 407 x 453 x 370mm 420 x 424 x 432mm Options 250 SCF, 250 SCF 250/500 SCF, Memory (factory option) Memory Service Manual Samsung Electronics...

  • Page 19: Summary Of Product

    2.2.1.1 Front View * The figure above shows an ML-2851ND. output tray tray 1 control panel optional tray 2 control board cover paper level indicator front cover output support manual tray manual tray paper width guides Service Manual Samsung Electronics...
  • Page 20 Product spec and feature 2.2.1.2 Rear View * The figure above shows an ML-2851ND. network port duplex unit USB port power receptacle optional tray 2 cable connector power switch a. ML-2851ND only. 2-10 Service Manual Samsung Electronics...
  • Page 21 2.2.1.3 Control Panel Error: Indicates the status of your printer. Online: Indicates the status of your printer. Cancel: Prints a demo page or configuration page. Cancels the print job. Makes the printer pick up the print media. 2-11 Service Manual Samsung Electronics...

  • Page 22: System Layout

    Product spec and feature 2.2.2 System Layout DEVE FUSER DUPLEX CASSETTE 2-12 Service Manual Samsung Electronics...
  • Page 23 7) SCF (Second Cassette Feeder) It is the same method with the main cassette, and the capacity is 250 sheets. It has a separate driving mechanism. It is designed for a common use with a main cassette. 2-13 Service Manual Samsung Electronics...
  • Page 24 - A fuser power is cut off when a front cover is opened - Maintain a temperature of fuser cover's surface under 80(C for user, and attach a caution label at where customer can see easily when customer open a rear cover. 2-14 Service Manual Samsung Electronics...
  • Page 25 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 paper. The one side of the polygon mirror is one line for scanning. 2-15 Service Manual Samsung Electronics...
  • Page 26 - Classifying device for toner cartridge : ID is classified by CRUM. except for initial cartridge. Cleaning Roller 0.32mW -250V -1.25KV ~ -1.45KV -750V -130V Cleaning Blade = -430V = -680V +4.2kV <Toner Cartridge Layout> 2-16 Service Manual Samsung Electronics...

  • Page 27: Engine H/W Specifications

    5V : 12 14 16 ) ASIC ASIC NOR Flash NOR Flash U17, U18 DC to DC U17, U18 DC to DC Converter Converter (3.3V) U15 (3.3V) U15 DC to DC DC to DC Converter Converter (1.3V) U5 (1.3V) U5 2-17 Service Manual Samsung Electronics...
  • Page 28 - Step Motor : 2 Channels - PWM : 8 Channels - ADC : 6 Channels I2C Controller - I2C(S-BUS) Slave Device Support(I2C Version 2.1) - RTC Core Voltage : 3V - 3 PLL : MAIN, PCI, PVC 2-18 Service Manual Samsung Electronics...
  • Page 29 MPF signal. It is turned on or off by C23, C18, D15 of CPU. The diode protects the driving TR from the noise pulse, which is flown when the solenoid id de-energizing. FAN Driving Circuit is driven by Transistor, and controlled by D14, E16 of CPU. 2-19 Service Manual Samsung Electronics...
  • Page 30 Rs value for sensing and voltage value for the V reference can be changed by motor driving voltage value. The motor driving voltage is calculated with the following formula. I = Vref / Rs, wherein Vref is (R1 5V) / (R1+R2). 2-20 Service Manual Samsung Electronics...
  • Page 31 - Output Voltage Rising Time : 50 ms Max - Output Voltage Falling Time : 50 ms Max - Output Loading range : 10M ~ 1000 M - Output Control Signal (BIAS-PWM) : the CPU output is HV output when PWM is low. 2-21 Service Manual Samsung Electronics...
  • Page 32 - Rated Frequency : 50/60 Hz - Frequency Fluctuating range : 47 ~ 63 Hz - Input Current : Under 4.0Arms / 2.0Arms (But, the status when e-coil is off or rated voltage is inputted/outputted ) 2-22 Service Manual Samsung Electronics...
  • Page 33 24V : 3 5 7 9 5V : 11 13 15 5V : 11 13 15 CON1 CON1 (Heat Lamp CON.) (Heat Lamp CON.) 250V 3.15A 250V 4A 250V 4A 250V 3.15A 250V 4A 250V 4A 2-23 Service Manual Samsung Electronics...
  • Page 34 Triac (Q501) feature : 24A-LV model / 16A-HV model, 600V SWITCHING Phototriac Coupler (PC501) - Turn On If Current : 15mA 50mA(Design: 16mA) - High Repetive Peak Off State Voltage : Min 600V 2-24 Service Manual Samsung Electronics...
  • Page 35 AD converter. The voltage value for impressing to the transfer roller is decided by the changed value. Each voltage value is controlled according to 3.3.4.2 Timing Chart. 2-25 Service Manual Samsung Electronics...
  • Page 36 Lready occurs. If two conditions are satisfied, the status are not satisfied, the error shown in below occurs. Error Description Polygon Motor Error Whenthe polygon motor speed doesn t become steady Hsync Error The polygon motor speed is steady but the Hsync is not generated 2-26 Service Manual Samsung Electronics...

  • Page 37: S/W Descriptions

    Host. 2. Kernel that control and management the whole procedure include of Control flow and Printing Job before transfer to Engine system. 2-27 Service Manual Samsung Electronics...
  • Page 38 4. Port Monitor that manages the network communication between spooler and Network Interface Card, or various addi- tional application and Network Interface Card,(this is, at first, make communication logical port, manage the data, transfer them from spooler to network port, and offer the result of printing). 2-28 Service Manual Samsung Electronics...
  • Page 39 Engine print the received data to required paper with the sequential developing process. The additional printing function are realized in (1) Web environment (2) Window environment. On addition, Kernel informs a status of printing status and printer status to user made printing job with the Status Monitor. 2-29 Service Manual Samsung Electronics...

  • Page 40: Disassembly And Reassembly

    3. Unplug the power cord. 4. Use a flat and clean surface. 5. Replace only with authorized components. 6. Do not force plastic-material components. 7. Make sure all components are in their proper posi- tion. Service Manual Samsung Electronics...

  • Page 41: Used Screw List

    CASSETTE SCREW-TAPTITE;PWH,+,-,B,M3,L6,ZPC(WHT),SWRCH18A,- 6003-000269 DRIVE SCREW-TAPTITE;BH,+,-,S,M3,L6,ZPC(WHT),SWRCH18A,- 6003-000282 DUPLEX UNIT SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- FRAME SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- FUSER SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- FRONT COVER SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- SCREW-TAPTITE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- 6003-000301 FRAME SCREW-TAPTITE;BH,+,-,S,M4,L6,ZPC(WHT),SWRCH18A,- 6003-001256 ENGINE SCREW-TAPTITE;BH,+,B,M4,L10,NI PLT,SWRCH18A 6006-001078 FRAME SCREW-TAPTITE;PH,+,WSP,B,M3,L10,ZPC(WHT), SWRCH18A,- 6002-000440 Duplex 1, Frame 13 PWH,+,-,2,M3,L8,ZPC(BLK),SWRCH18A,- Service Manual Samsung Electronics...

  • Page 42: Cover Unit

    Disassembly and Reassembly 3.3 Cover Unit 3.3.1 CASSETTE & Front Cover 1. Remove the CASSETTE 2. Remove the FRONT COVER carefully, especially hooks. 3. Remove the TONER CARTRIGE. Service Manual Samsung Electronics...

  • Page 43: Duplex Unit & Cover-Top/Cover-Rear

    3.3.2 DUPLEX UNIT & COVER-TOP/COVER-REAR 1. Remove two SCREW in front view 2. Turning back of SET, remove DUPLEX UNIT like below figure. 3. After open the COVER-REAR, remove two SCREWs, then disassemble the Cover-Top up. 4. Remove COVER-REAR. Service Manual Samsung Electronics...

  • Page 44: Cover-Side-Left/Right

    Disassembly and Reassembly 3.3.3 Cover-Side-LEFT/RIGHT 1. Remove their first hook from frame-base. 2. After removing the hook of backside, remove Cover-Side-LEFT/RIGHT. Service Manual Samsung Electronics...

  • Page 45: Fuser Ass'y

    1. Before fuser ass’y removal, Remove COVER-TOP/DUPLEX/COVER-REAR. 2. After remove guide-rear assy like below figure, remove four screws of fuser assy. 3. In upper view, remove the three harness connected to fuser. 4. Remove fuser carefully not to damage HARNESSes. Service Manual Samsung Electronics...

  • Page 46: Lsu(Laser Scanning Unit)

    Disassembly and Reassembly 3.5 LSU(Laser Scanning Unit) 1. Before LSU ass’y removal : - Remove the COVER-TOP/COVER-RIGHT. 2. Remover four Screw (M4,L10) of LSU and one connector from Main B’D. Service Manual Samsung Electronics...

  • Page 47: Drive Ass'y

    Disassembly and Reassembly 3.6 Drive Ass’y 1. Before Drive ass'y removal : - Remove the CASSETTE/Cover-FRONT/COVER-TOP/COVER-LEFT Assy. 2. Remove the seven Screws and remove Drive Ass'y carefully. 3. Remove the Connector of Drive Ass'y. Service Manual Samsung Electronics...

  • Page 48: Main Pba/Smps/Hvps

    3.7 Main PBA/SMPS/HVPS 1. Before Main PBA/SMPS/HVPS removal :: - Remove CASSETTE/COVER-FRONT/COVER-TOP/COVER-RIGHT 2. HVPS : Remove 6 screws and 1 HARNESS SMPS : Remove 4 screws and 3 HARNESSes Main PBA : Remove 4 screws and all HARNESSes Service Manual Samsung Electronics...

  • Page 49: Holder-Pad Disassembly

    Disassembly and Reassembly 3.8 HOLDER-PAD Disassembly 1. Remove the CASSETTE from SET. 2. Disassemble HOLER-PAD after putting out three HOOKs 3-10 Service Manual Samsung Electronics...

  • Page 50: Transfer Roller

    Disassembly and Reassembly 3.9 Transfer Roller 1. Open the COVER-FRONT. 2. Push HOLDER-TRANSFER, which holds the transfer roller and remove the roller from set. 3. Be carefull not to touch the sponge of Transfer Roller. 3-11 Service Manual Samsung Electronics...

  • Page 51: Alignment And Adjustments

    4.1.1.1 Printing a Demo Page After setting up your printer, print a demo page to make sure that the printer is operating correctly. Press and hold the Cancel button for about 2 seconds. A demo page prints out. Service Manual Samsung Electronics...
  • Page 52 Alignment & Troubleshooting 4.1.1.2 Printing a configuration Page Press and hold the Cancel button for about 4 seconds. A configuration page prints out.(print out with the menu map sheet) Service Manual Samsung Electronics...
  • Page 53 Alignment & Troubleshooting Service Manual Samsung Electronics...

  • Page 54: Control Panel

    4.1.2.1 Control Panel Error: Indicates the status of your printer. Online: Indicates the status of your printer. Cancel: Prints a demo page or configuration page. Cancels the print job. Makes the printer pick up the print media. Service Manual Samsung Electronics...
  • Page 55 • Mac OS 8.6 ~ 9.2, 10.1 ~ 10.4 Network protocols • TCP/IP • EtherTalk • HTTP 1.1 • SNMP Dynamic addressing server • DHCP, BOOTP • TCP/IP: Transmission Control Protocol/Internet Protocol • DHCP: Dynamic Host Configuration Protocol • BOOTP: Bootstrap Protocol Service Manual Samsung Electronics...
  • Page 56 4. Open the language folder you want to use. 5. Double click Setup.exe to install this program. 6. From the Windows Start menu, select Programs > Samsung Network Printer Utilities > SetIP. 7. Select the name of your printer and click "...

  • Page 57: Consumables And Replacement Parts

    • The printer is on-line and can receive data from the computer. Blinking • Blinks slowly indicates that the printer is receiving data from the computer. • Blinks quickly indicates that the printer is printing data. Service Manual Samsung Electronics...

  • Page 58: Abnormal Image Printing And Defective Roller

    Developing Roller 35.2mm White Spot, Horizontal black band Transfer Roller 47mm Ghost, Damaged Image by abnormal transfer Heat Roller 77.6mm Black Spots or Vertical Black Band Pressure Roller _1st 62.8mm Blackground Pressure Roller _2st 37.7mm Blackground Service Manual Samsung Electronics...

  • Page 59: How To Use Dcu

    COVER OPEN ERROR NO PAPERR PAPER JAM 0 PAPER JAM 1 PAPER JAM 2 LSU NOT READY DIAGNOSTIC DOWN SHIFT STOP MODE ENTER TO ENTER DIAGNOSTIC MODE, PUSH THREE BUTTONS SIMUL ANEOUSL AND TURN THE PRINTER POWER ON. Service Manual Samsung Electronics...
  • Page 60 The front part of paper is jammed between the Discharge sensor and Feed sensor. Paper Jam 2 The front part of paper is jammed just after passing through the discharge sensor. LSU Not Ready LSU Scanner Motor not ready. LSU Not Ready Hsync signal not output. 4-10 Service Manual Samsung Electronics...
  • Page 61 [Up] button to Check LD. LD is functioning and the middle button is on. If the LD is normal, all LEDs are on. Pickup clutch on The Solenoid in the printer is in operation. To stop the operation, Press the button [shift] and [Enter] together. 4-11 Service Manual Samsung Electronics...
  • Page 62 Indicates the function of the Fan, same method of the code ‘07’. Manual Pickup Test : Indicates the function of th Manual Pickup, same method of the code ‘07’. Manual Sensor Test : Indicates the function of the Manual Sensor, same method of the code ‘07’. 4-12 Service Manual Samsung Electronics...
  • Page 63 READY Mode, and '88' shows in the DCU. In this mode, without any detection, the printer begins printing(trial printing and data from the PC). It is convenient to use this mode when the engine malfunction is detected in the control board. 4-13 Service Manual Samsung Electronics...
  • Page 64 Alignment & Troubleshooting 4.1.6.5 Paper Path DEVE FUSER DUPLEX CASSETTE 4-14 Service Manual Samsung Electronics...

  • Page 65: Paper Jam

    If the paper does not move when you pull, or if you do not see the paper in this area, check the fuser area around the toner cartridge. 3. Insert the tray 1 into the printer until it snaps into place. Printing automatically resumes. 4-15 Service Manual Samsung Electronics...
  • Page 66 3. 3. Pull the tray 1 half. 4. Pull the paper straight up and out. 5. Insert the trays back into the printer. Printing automatically resumes. 4-16 Service Manual Samsung Electronics...
  • Page 67 If you do not see the jammed paper or if there is any resistance when you pull, stop and go to the guide rear next step. 3. Open the rear cover. 5. Close the rear cover. Printing automatically resumes. 4-17 Service Manual Samsung Electronics...
  • Page 68 2. Remove the jammed paper from the duplex unit. guide rear 3. Close the rear cover. Printing automatically resumes. If the paper does not come out with the duplex unit, remove the paper from the bottom of the printer. 4-18 Service Manual Samsung Electronics...
  • Page 69 • If paper jams occur frequently when you print on A5-sized paper. Load the paper into the tray with the long edge facing the front of the tray. In the printer properties window, set the page orientation to be rotated 90 degrees. 4-19 Service Manual Samsung Electronics...

  • Page 70: Download & Reset F/W

    In Dos Prompt, type "Usblist2 [Rom file name]" and Press Enter Status LED Slow blink Fast bli nk then print out LED Panel configuration page Check th e OS version and total pa ge value is "0" Please set power On/ Off 4-20 Service Manual Samsung Electronics...

  • Page 71: Troubleshooting

    Green LED on? - Main PBA error - Panel PBA error Refer to Ready or Error Lamp ON? 4.1.4 LED Status Power save Error Message Test Print printing Refer to "Solution Quality is of Image Problem" Nomal? 4-21 Service Manual Samsung Electronics...

  • Page 72: The Cause And Solution Of Bad Image

    3. Partly depression or Replace the transfer roller if deformation on the surface of occurred as No. 3. the transfer roller. 4-22 Service Manual Samsung Electronics...
  • Page 73 If the problems are not solved, substances are on the OPC Drum. replace the toner cartridge. 6. Partly depression or Replace the transfer roller if deformation on the surface of the occured as NO.6 transfer roller 4-23 Service Manual Samsung Electronics...
  • Page 74 Charge roller = 26.7mm in the OPC. Supply roller = 47.1mm 2. If the malfunction persists, Develop roller = 35.2mm replace the toner cartridge. Transfer roller = 47mm 4-24 Service Manual Samsung Electronics...
  • Page 75 3. Clean the inside of the set against the paper particles and foreign matter in order not to cause the trouble. 4-25 Service Manual Samsung Electronics...
  • Page 76 HVPS and the one in the set. 4. Abnormal output Replace the HVPS if the from the HVPS. problems are not solved by the (Run self-test and check 1~4) above four instructions. 4-26 Service Manual Samsung Electronics...
  • Page 77 2. Replace the HVPS if not solved cartridge and charge terminal by the above direction 1 and 2. of HVPS. 3. VD0 signal of the Main PBA is Low state. Replace the LSU Unit or Main PBA. 4-27 Service Manual Samsung Electronics...
  • Page 78 2. The life of the Toner cartridge shake the toner cartridge. has expired. 3. The toner level is not even on Replace the toner cartridge and the toner cartridge roller due to the try to print out. bad blade. 4-28 Service Manual Samsung Electronics...
  • Page 79 4. Is the movement(Up and Down) transfer roller. of the transfer roller smooth? 1. If the problem is still not solved, replace the toner cartridge. 5. Is the HVPS normal? 2. Gently shake the toner cartridge. 4-29 Service Manual Samsung Electronics...
  • Page 80 3. The life of toner cartridge is expired. solved by the above directions 1-2. If not solved by the direction 3, 4. Transfer roller lifetime(50K sheets) check the transfer roller lifetime has expired. and replace it. Continue.. 4-30 Service Manual Samsung Electronics...
  • Page 81 5. Abnormal low temperature Wait about 1 hour after power on (below 10°C). before using printer. Occur in the toner cartridge, 6. Damaged cleaning blade in the replace the toner cartridge and toner cartridge. try to print out. 4-31 Service Manual Samsung Electronics...
  • Page 82 Select 'Thick Mode' on paper type thicker than normal paper or menu from the software application transparencies such as OHP, higher and after using returning to the transfer voltage is original mode is recommended. required. 4-32 Service Manual Samsung Electronics...
  • Page 83 Digital Printer Disassemble the fuser and remove the contaminated toner particles on The temperature of the fuser is the roller and clean the foreign maintained high. matter between Thermistor and Heat roller. (Caution: can be deformed) 4-33 Service Manual Samsung Electronics...
  • Page 84 2. If the transfer roller is contaminated, run PC Cleaning contaminated, stains on the face of Mode Print 2 or 3 times. page will occur. And perform Self-Test 2 or 3 times to remove contamination. 4-34 Service Manual Samsung Electronics...
  • Page 85 2. Disassemble the fuser and clean 2. 62.8mm : Pressure roller is the H/R(Heat Roller) and P/R contaminated. (Pressure roller). And check the area between H/R and Thermistor. If contaminated, clean the area not to be deformed. 4-35 Service Manual Samsung Electronics...
  • Page 86 Digital Printer Digital Printer 1. Check if the Ground-OPC is defective(set inside right side). Bad ground contacts in OPC and/or 2. Remove contamination of the toner cartridge. terminals of the toner cartridge and the unit. 4-36 Service Manual Samsung Electronics...
  • Page 87 DCU to check if the Solenoid is normal. 2. Abnormal solenoid. 2. If not solved by the above directions 1-2, Replace the engine board. 3. Turn the power off, delete the data of PC and try printing again. 4-37 Service Manual Samsung Electronics...

  • Page 88: The Cause And Solution Of The Bad Discharge

    4.2.3 The cause and solution of the bad discharge 1) Wrong Print Position Description: Printing begins at wrong position on the paper. Wrong sense time caused by defective Replace the defective actuator feed sensor actuator. 4-38 Service Manual Samsung Electronics...
  • Page 89 Replace the Main PBA and/or slot between shaft-pickup and Sensor. housing-pickup opens or is broken away. 5. If the paper feeds into the printer and Jam 0 occurs, perform DCU to check feed-sensor of the engine board. 4-39 Service Manual Samsung Electronics...
  • Page 90 1. Replace the Main PBA. stuck in the discharge roller and the 2. Reassemble the Actuator-Feed fuser just after passing through the and Spring-Actuator if the Actuator-Feed, Feed Actuator movement is bad. may be defective. 4-40 Service Manual Samsung Electronics...
  • Page 91 : Clean the surface of the pressure roller with dry gauze. • Remove the toner particles stained on the rib. 3. Paper is accordion in the fuser. • Check the assemblage and performance of the exit. 4-41 Service Manual Samsung Electronics...
  • Page 92 Alignment & Troubleshooting 5) JAM Duplex Description: Recording paper is Jamned in front or inside a duplex module. It is a case that a paper cannot Replace a duplex roller. reach to a registration sensor. 4-42 Service Manual Samsung Electronics...
  • Page 93 (the solenoid does not work properly): Perform DCU. Clean the pad friction with soft 3. Pad-Friction is contaminated cloth dampened with IPA with foreign matter.(oil...) (Isopropyl Alcohol). Use the smooth paper. 4. The face of paper is blended. 4-43 Service Manual Samsung Electronics...
  • Page 94 2. Clean the surface of the heat roller with IPA or water 3. Check the warp or separation of the print claw and the holder plate claw, and then manage it. 4-44 Service Manual Samsung Electronics...
  • Page 95 How to remove the rolled paper in the OPC. Remove the paper while turning 2. The face of paper is curled. the OPC against the ongoing direction. Clean fingerprints on the OPC softly with soft cloth dampened with tissue. 4-45 Service Manual Samsung Electronics...

  • Page 96: The Cause And Solution Of The Malfunction

    Check whether the overheat mode circuit operates normally 3. Heat lamp ON/OFF test or not. 4. It could not operate Replace the fuser. due to a gear of a fuser is melted. 4-46 Service Manual Samsung Electronics...
  • Page 97 Replace a LSU connector is disconnected or not. Replace a main board if the same 2. Check whether the LSU error occurs again after replacing motor is rotating or not. a LSU. 3. Check the HSYNC signal. 4-47 Service Manual Samsung Electronics...
  • Page 98 3) Not function of the gear of the fuser due to melting away Description: The motor breaks away from its place due to gear melting away. 1. Replace the Fuser. 1. Check the Heat Lamp. 2. Replace the Main PBA. 3. Replace the SMPS. 4-48 Service Manual Samsung Electronics...
  • Page 99 Description: The paper lamp on the operator panel is on even when paper is loaded in the cassette. 1. Bending or deformation Replace the defective actuator. of the actuator of the paper sensor. 2. The function of the Replace the Sensor PBA. engine board is defective 3. Check the Connector. 4-49 Service Manual Samsung Electronics...
  • Page 100 Description: The paper lamp on the operator panel does not come on when the paper cassette is empty. 1. Bending or deformation Replace the defective actuator. of the actuator of the paper sensor. 2. The function of the Replace the engine board. engine board is defective 4-50 Service Manual Samsung Electronics...
  • Page 101 1. Check the insertion of the 2. Check the connector Cover Open S/W Connect. and circuit of the cover switch department 2. Replace the Main Control in the Main Control board. board or Cover Open S/W. 4-51 Service Manual Samsung Electronics...
  • Page 102 1. Check the insertion of the 1. Check the connector and Cover Open S/W Connect. circuit of the cover switch department 2. Replace the Main Control in the Main Control board. board or Cover Open S/W. Perform DCU test 4-52 Service Manual Samsung Electronics...
  • Page 103 2. Clean the surface of the heat roller with IPA or water 3. Check the warp or separation of the print claw and the holder plate claw, and then manage it. 4-53 Service Manual Samsung Electronics...
  • Page 104 SMPS output are normal. 2. Check the inferiority 1. Replace the control board. of LED-Panel or LCD window on the 2. Replace the OP panel. front-cover if the OP panel does not appear after normal warming-up. 4-54 Service Manual Samsung Electronics...
  • Page 105 Main Control board Replace LSU. linking with LSU, check drive by DCU test: LSU Check. 1. Replace theToner Joint PBA. 2. Chect the Deve PBA 2. Replace the MainPBA. in the Toner Cartridge. 4-55 Service Manual Samsung Electronics...

  • Page 106: Toner Cartridge Service

    Alignment & Troubleshooting 4.2.5 Toner Cartridge Service It is not guaranteed for the default caused by using other toner cartridge other than the cartridge supplied by the Samsung Electronic or caused by non-licensed refill production. 4.2.5.1 Precautions on Safe-keeping of Toner Cartridge Excessive exposure to direct light more than a few minutes may cause damage to the cartridge.
  • Page 107 - Contents: Turning the red LED on means the life span of a toner cartridge (except a toner part) has been ended. - Solution: If an Toner Cartridge Life cycle Probreum, in a worst case, a toner overflows and it may cause a system fail. Therefore, recommend a user to replace a toner cartridge. 4-57 Service Manual Samsung Electronics...

  • Page 108: The Cause And Solutions Of Bad Environment Of The Software

    4. Check if the printer cable is If the scanner needs to be connected to the directly connected to peripheral devices printer, first the remove the scanner from the PC to see if the printer is properly working alone. 4-58 Service Manual Samsung Electronics...
  • Page 109 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. 4-59 Service Manual Samsung Electronics...
  • Page 110 Delete the unnecessary files to secure (The printing job sometimes stops or due enough space of the hard disk and start to insufficient virtual memory, but it actually printing job again. comes from the insufficient space of the hard disk.) 4-60 Service Manual Samsung Electronics...
  • Page 111 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. 4-61 Service Manual Samsung Electronics...
  • Page 112 - USB 2.0, N/W (ML-2851ND only) - 32MB (Max.160MB : factory option) - 2K Standard, 5K High Yield - Paper Input: 250 sh CST + 1 sh MP - Standard Duplex Printing - Options: 250 sh SCF Service Manual Samsung Electronics...

  • Page 113: Main

    ExplodedView and Parts list 5.1 Main Service Manual Samsung Electronics...
  • Page 114 JC97-03013A MEA UNIT-COVER_LEFT 5.1-16-2 JC97-03014A MEA UNIT-COVER_RIGHT 5.1-16-3 JC97-03015A MEA UNIT-COVER_REAR 5.1-16-4 JC97-03016A MEA UNIT-COVER FRONT 5.1-17 JC97-03017A MEA UNIT-CASSETTE 5.1-18 JC96-04735A ELA UNIT-SCF 5.1-19 3903-000085 CBF-POWER CORD(110V) 5.1-19 3903-000042 CBF-POWER CORD(220V) 5.1-20 JC96-04823B ELA HOU-DEVE Service Manual Samsung Electronics...

  • Page 115: Top Cover

    ExplodedView and Parts list 5.2 Top Cover Service Manual Samsung Electronics...
  • Page 116 SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE Drawer# SEC_Code Description QT'y Service Remark 5.2-0 JC97-03012A MEA UNIT-COVER_TOP 5.2-1 JC63-01523A COVER-TOP 5.2-2 JC61-02230A STACKER-RX 5.2-3 JC72-01343A PMO-SUB_M_STACKER 5.2-5 JC63-01528A COVER-DUMMY KEY 5.2-7 JC67-00274A LENS-LED 5.2-8 6107-001169 SPRING-CS 5.2-9 JC64-00359A KEY-ON_LINE 5.2-10 6003-000196 SCREW-TAPTITE Service Manual Samsung Electronics...

  • Page 117: Cover Ass'y

    ExplodedView and Parts list 5.3 Cover Ass'y Service Manual Samsung Electronics...
  • Page 118 SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE Drawer# SEC_Code Description QT'y Service Remark 5.3-0 JC96-04741A ELA HOU-COVER 5.3-1 JC97-03016A MEA UNIT-COVER_FRONT 5.3-2 JC97-03013A MEA UNIT-COVER_LEFT 5.3-3 JC97-03014A MEA UNIT-COVER_RIGHT 5.3-3-1 JC63-01525A COVER-RIGHT 5.3-3-2 JC63-01570A COVER-RIGHT_DIMM 5.3-4 JC97-03015A MEA UNIT-COVER_REAR Service Manual Samsung Electronics...

  • Page 119: Front Cover

    ExplodedView and Parts list 5.4 Front Cover Service Manual Samsung Electronics...
  • Page 120 Front Cover Parts List SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE Drawer# SEC_Code Description QT'y Service Remark 5.4-0 JC97-03016A MEA UNIT-COVER_FRONT 5.4-1 JC63-01527A COVER-FRONT 5.4-2 JB64-00007A LOCKER-LATCH PUSH 5.4-3 JC63-01569A COVER-MANUAL 5.4-4 JC61-02267A BRACKET-MANUAL 5.4-5 6003-000282 SCREW-TAPTITE Service Manual Samsung Electronics...

  • Page 121: Rear Cover

    ExplodedView and Parts list 5.5 Rear Cover 5-10 Service Manual Samsung Electronics...
  • Page 122 ExplodedView and Parts list Rear Cover Parts List SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE Drawer# SEC_Code Description QT'y Service Remark 5.5-0 JC97-03015A MEA UNIT-COVER_REAR 5.5-1 JC63-01526A COVER-REAR 5.5-2 JC61-02399A GUIDE-CHANGE_DUP 5-11 Service Manual Samsung Electronics...
  • Page 123 ExplodedView and Parts list 5.6 Frame1 5-12 Service Manual Samsung Electronics...

  • Page 124: Frame

    ExplodedView and Parts list Frame2 5-13 Service Manual Samsung Electronics...
  • Page 125 HOUSING-M-PICK UP_R2 5.6-27 JC61-00587A BUSH-M-PICK_UP R 5.6-28 JC66-01660A SHAFT-FEED 5.6-29 JC66-01634A GEAR-FEED DR 16 5.6-30 JC63-01614A GROUND-GUIDE TR 5.6-31 6107-001352 SPRING-TS 5.6-32 JC66-00377A CAM-M-PICK_UP 5.6-33 6044-000001 RING-CS;ID3,OD3,T0.25,BLACK,SU 5.6-34 JC66-40964A GEAR-EXIT,IDLE(Z17) 5.6-35 JC66-01627A GEAR-FEED RDCN 24/19 5-14 Service Manual Samsung Electronics...
  • Page 126 JC66-00387A GEAR-RACK_PINION 5.6-72 JC66-01647A ACTUATOR-FEED 5.6-73 JC66-01646A ACTUATOR-DUPLEX 5.6-74 6107-001164 SPRING-TS 5.6-75 0604-001095 PHOTO INTERRRUPTER 5.6-76 JC39-00824A CBF HARNESS-HVPS 5.6-77 JC61-02309A FRAME-DUPLEX_PATH 5.6-78 JC66-01022A ROLLER-M-IDLE SCF 5.6-79 JC66-01846A SHAFT-DUP_ROLLER 5.6-80 JC61-02303A GUIDE-FRAME_DUPLEX 5.6-81 JC63-01743A SHEET-GUIDE_DUP_PATH 5-15 Service Manual Samsung Electronics...
  • Page 127 5.6-106 JC65-00033A TERMINAL SPRING TR 5.6-107 JC61-00588A PMO-BUSHING_TR(L) 5.6-108 JC61-02304A GUIDE-HOLDER_TR 5.6-109 JC61-00553A SPRING ETC-ES (Guide holder TR) 5.6-110 JC61-02231A HOLDER-TRANSFER 5.6-111 JC66-01649A LINK-COVER_REAR 5.6-112 6107-001172 SPRING-CS 5.6-114 JC97-03067A MEA UNIT-GUIDE REAR 5.6-115 JC61-00424A BUSH-4 5-16 Service Manual Samsung Electronics...

  • Page 128: Main Drive

    ExplodedView and Parts list 5.7 Main Drive 5-17 Service Manual Samsung Electronics...
  • Page 129 GEAR-RDCN 52/18 5.7-10 JC66-01798A GEAR-OPC CLUTCH 29 5.7-11 JC66-01637A GEAR-FUSER DR OUT 37 5.7-12 6031-000023 WASHER-PLAIN 5.7-13 JC61-02227A BRACKET-MOTOR 5.7-14 JC31-00090A MOTOR BLDC 5.7-15 6003-000269 SCREW-TAPTITE 5.7-18 6044-001130 RING-C 5.7-19 JC70-00548A HUB-CLUTCH 5.7-20 6107-001372 SPRING CLUTCH 5-18 Service Manual Samsung Electronics...

  • Page 130: Rear Guide

    ExplodedView and Parts list 5.8 Rear Guide 5-19 Service Manual Samsung Electronics...
  • Page 131 SA : SERVICE AVAILABLE, SNA : SERVICE not AVAILABLE Drawer# SEC_Code Description QT'y Service Remark 5.8-0 JC97-03067A MEA UNIT-GUIDE REAR 5.8-1 JC61-02198A GUIDE-REAR 5.8-2 JC66-01661A ROLLER-IDLE_EXIT 5.8-3 JC61-02158A BUSH-TX 5.8-4 JC66-01584A SHAFT-EXIT_F/UP 5.8-5 JC66-01583A GEAR-EXIT 5.8-6 JC73-00259A RUBBER-EXIT_F/UP 5-20 Service Manual Samsung Electronics...

  • Page 132: Fuser

    ExplodedView and Parts list 5.9 Fuser 5-21 Service Manual Samsung Electronics...
  • Page 133 6107-001246 SPRING-CS 5.9-28 6044-000159 RING-C 5.9-29 6107-001361 SPRING-ES 5.9-30 4713-001212 LAMP-HALOGEN 5.9-31 JC67-00266A CAP-LAMP_L 5.9-32 JC67-00267A CAP-LAMP_R 5.9-33 JC66-01638A GEAR-FUSER RDCN 28-20 5.9-34 JC66-00056A GEAR-MPF 5 5.9-35 6031-001051 WASHER-PLAIN 5.9-36 6044-000001 RING-CS 5.9-37 0604-001095 PHOTO-INTERRUPTER 5-22 Service Manual Samsung Electronics...

  • Page 134: Duplex Unit

    ExplodedView and Parts list 5.10 Duplex Unit 12-1 12-2 12-1 12-2 5-23 Service Manual Samsung Electronics...
  • Page 135 ELA UNIT-ROLLER_DUP 5.10-12-1 JC66-00901A ROLLER-FEED_DUP 5.10-12-2 6044-000107 RING-C 5.10-13 JC61-02235A BRACKET-DUPLEX_ALIGN 5.10-14 6003-000440 SCREW-TAPPING 5.10-15 JC61-02314A GUIDE-DUPLEX_UPPER 5.10-16 JC66-00896A ROLLER-M-IDLE_ DUP 5.10-17 JK72-00058A PCT-SILP WASHER 5.10-18 JC66-00444A SHAFT-IDLE ROLL, DUP 5.10-19 6107-001156 SPRING-TS 5.10-20 6003-000196 SCREW-TAPTITE 5-24 Service Manual Samsung Electronics...

  • Page 136: Cassette

    ExplodedView and Parts list 5.11 Cassette 5-25 Service Manual Samsung Electronics...
  • Page 137 PMO-PLATE_LOCKER 5.11-13 JG61-70531A SPRING ETC-LOCKER,PLATE 5.11-14 JC96-04743A ELA HOU-HOLDER_PAD 5.11-15 JC61-01978A HOUSING-HOLDER PAD 5.11-16 JC63-01531A COVER-HANDLE_CASSETTE 5.11-17 6107-001047 SPRING-ES 5.11-18 JC66-00529A ROLLER-M-IDLE FEED 5.11-19 6003-000196 SCREW-TAPTITE 5.11-20 JC64-00353A INDICATOR-PAPER 5.11-21 JC63-01670A SHEET-GUIDE_SIDE_FAR 5.11-22 JC63-01671A SHEET-GUIDE_SIDE_NEAR 5-26 Service Manual Samsung Electronics...

  • Page 138: Scf

    ExplodedView and Parts list 5.12 SCF 5-27 Service Manual Samsung Electronics...
  • Page 139 PMO-ACTUATOR EMPTY 5.12-11-7 JC63-00527A SHEET-BRUSH 5.12-11-8 JC75-00095A MEC-BRUSH ANTISTATIC 5.12-11-9 JC61-40001A FOOT-ML80 5.12-11-10 JC61-00836A FOOT-FRONT 5.12-11-11 JC63-01609A COVER-HARNESS_SCF 5.12-11-12 JC63-00492A COVER-M-SIMM R2 5.12-11-13 JC92-01911A PBA-SCF 5.12-11-14 JC63-01636A GROUND-PAPER_SCF 5.12-11-15 JC63-01635A GROUND-BRUSH_SCF 5.12-11-16 JC33-00026A SOLENOID-PICK UP 5-28 Service Manual Samsung Electronics...
  • Page 140 BUSH-M-PICK_UP R 5.12-11-18 JC61-00915A STOPPER-M-PICK UP_R2 5.12-11-19 JC72-00982A PMO-IDLE PICK_UP 5.12-11-27 JC66-00394A GEAR-FEED 2 5.12-11-29 JC72-00980A PMO-GEAR PICK_UP B 5.12-11-31 6107-001170 SPRING-TS 5.12-21 JC61-00586A BUSH-M-PICK_UP L 5.12-22 JC66-01653A SHAFT-FEED_SCF 5.12-23 JC66-00598A ROLLER-FEED 5.12-24 JC72-00382B PMO-BUSHING FEED 5-29 Service Manual Samsung Electronics...

  • Page 141: System Diagram

    System Diagram 6. System Diagram 6.1 Block Diagram Service Manual Samsung Electronics...

  • Page 142: Connection Dia Ram

    System Diagram 6.2 Connection Diagram LED1 LED2 Service Manual Samsung Electronics...

  • Page 143: Reference Information

    • Cotton Swab Standard : Test equipment to diagnose the Laser Standard : For general home use, for medical service. printer supplied by Samsung Electronics. • Cleaning Equipments Standard : An IPA(Isopropyl Alcohol)dry wipe tissue or a gentle neutral detergent and lint-free cloth.
  • Page 144 Host Based Printing Hard Disk Drive High temperature and high marshy place high voltage HVPS High Voltage Power Supply interface Input and Output integrated circuit Intelligent Drive electronics or Imbedded Drive Electronics Service Manual Samsung Electronics...

  • Page 145: Acronyms And Abbreviations

    Quick Printer Initiating Device Q ty quantity Random Access Memory Read Only Memory Second Cassette Feeder SMPS Switching Mode Power Supply SPGP Samsung Printer Graphic Processor Samsung Printer Language Spool Simultaneous Peripheral Operation Online switch sync synchronous or synchronization Universal Serial Bus WECA...

  • Page 146: Select A Location For The Printer

    • Provide the proper environment : - A firm, level surface - Away from the direct airflow of air conditioners, heaters, or ventilators - Free of extreme fluctuations of temperature, sunlight, or humidity - Clean, dry, and free of dust Service Manual Samsung Electronics...

  • Page 147: Sample Tests Patterns

    The life of the toner cartridge, developer cartridge and printing speed are measured with the pattern shown below (5%). The A4 ISO 19752 standard pattern samples are reproduced reduced to 70% of the actual A4 size. Service Manual Samsung Electronics...

  • Page 148: Lan (Optional Function)

    Link LED off, Link Inferiority Active LED(Orange) 7.6 Information of model's code Model code Description Remark ML-2850D Mono Laser printer,28ppm/Duplex Basic model ML-S2850A ELA UNIT-SCF Option model ML-2851ND Mono Laser printer,28ppm,Network,Duplex Basic model ML-D2850A/B 2/5K Toner Cartridge High yield Service Manual Samsung Electronics...

  • Page 149: Parts Life Cycle Maintenance Table

    Image Fainted After shake cartridge right and left 5~6 times, if printing image is not fainted, no failure. (Toner Exhausted) Vertical Black Line Vertical thin line emerge, if cartridge is scratched. - (Customer fault) Service Manual Samsung Electronics...

  • Page 150: Model Information

    2. Domestic Entry Model byproduct planning planning group Distribution group with sales responsed - C&C : Engine speed prospect) - Information : The first number deleted Description Alphabet Digit Alphabet Service Manual Samsung Electronics...

  • Page 151: Understanding Material Code & Name

    ELA UNIT-COVER TOP Type1 : Parts managed by entire divisions : Materials used by all samsung products. Most electrical parts are under the type 1. Type 2 : Parts managed by a division : Material used by a certain product Most mechanical parts are under type 2.

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