Samsung ML-331xD Service Manual
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Samsung ML-331xD Service Manual

Digital laser printer
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1. Speed
• ML-331x series : 31 ppm in A4 / 33 ppm in Letter
• ML-371x series : 35 ppm in A4 / 37 ppm in Letter
2. Processor
• ML-331x series : 375 MHz
• ML-371x series : 600 MHz
3. Printer Languages
• ML-331x series : SPL, PCL5e
• ML-371x series : PCL6/5e, PostsScript3, IBM
ProPrinter, EPSON
CÓPIA NÃO CONTROLADA

Service Manual

DIGITAL LASER PRINTER
ML-331x/ML-371x Series
ML-331xD/331xND/371xD/371xND/371xDW
4. Memory (Std / Max)
• ML-331x series : 64 MB / 64 MB
• ML-371xD : 64 MB / 320 MB
• ML-371xND/371xDW : 128 MB / 384 MB
5. Interfaces
• High Speed USB 2.0
• 10/100 BaseTX network connector (ML-331xND)
• 10/100/1000 BaseTX network connector (ML-371xND/371xDW)
• 802.11b/g/n wireless LAN (ML-371xDW)
• IEEE 1284 Parallel (Optional)
6. Toner Cartridge (Initial / Sales)
• ML-331x series : 2K / 2K, 5K
• ML-371x series : 5K / 2K, 5K, 10K
CÓPIA NÃO CONTROLADA

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Summary of Contents for Samsung ML-331xD

  • Page 1: Service Manual

    CÓPIA NÃO CONTROLADA Service Manual DIGITAL LASER PRINTER ML-331x/ML-371x Series ML-331xD/331xND/371xD/371xND/371xDW 1. Speed 4. Memory (Std / Max) • ML-331x series : 64 MB / 64 MB • ML-331x series : 31 ppm in A4 / 33 ppm in Letter •...
  • 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. September. 2010 China : china.samsungportal.com Printed in Korea. Asia : asia.samsungportal.com Mideast & Africa : mea.samsungportal.com VERSION NO. : 1.00 CODE : 3310-00000E CÓPIA NÃO CONTROLADA...

  • Page 3: Table Of Contents

    CÓPIA NÃO CONTROLADA Contents chapter 1 Precautions 1.1 Safety Warning …………………………………………………… 1-1 1.2 Caution for safety ………………………………………………… 1-2 1.2.1 Toxic material ………………………………………………… 1-2 1.2.2 Electric Shock and Fire Safety Precautions ……………… 1-2 1.2.3 Handling Precautions ……………………………………… 1-3 1.2.4 Assembly / Disassembly Precautions …………………… 1-3 1.2.5 Disregarding this warning may cause bodily injury ………...
  • Page 4 CÓPIA NÃO CONTROLADA Contents 3.3 Disassembly procedure ………………………………………… 3-3 3.3.1 Cover ………………………………………………………… 3-3 3.3.2 Main board …………………………………………………… 3-6 3.3.3 HVPS board ………………………………………………… 3-6 3.3.4 SMPS board ………………………………………………… 3-7 3.3.5 Laser Scanning Unit (LSU) ………………………………… 3-7 3.3.6 Fuser unit …………………………………………………… 3-8 3.3.7 Main drive unit ………………………………………………...
  • Page 5 CÓPIA NÃO CONTROLADA Contents chapter 5 System Diagram 5.1 Block Diagram …………………………………………………… 5-1 5.2 Connection Diagram……………………………………………… 5-3 chapter 6 Reference Information 6.1 Tool for Troubleshooting ………………………………………… 6-1 6.2 Acronyms and Abbreviations …………………………………… 6-2 6.2.1 Acronyms …………………………………………………… 6-2 6.2.2 Service Parts ………………………………………………… 6-4 6.3 A4 ISO 19752 Standard Pattern …………………………………...

  • Page 6: Safety Warning

    High voltages and lasers inside this product are dangerous. This printer should only be serviced by a suitably trained and quali ed 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 re haz- ards.

  • 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 recommend 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: Handling Precautions

    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: Disregarding This Warning May Cause Bodily Injury

    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. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • 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 oor, can generate static electricity suf cient to damage an ESD. Samsung Electronics Service Manual ML-331x/371x series...

  • Page 11: Product Specifi Cations And Descriptions

    • 802.11b/g/n wireless LAN (ML-371xDW) • IEEE 1284 Parallel (Optional) 6. Toner cartridge (Initial / Sales) • ML-3310 series : 2K / 2K, 5K • ML-3710 series : 5K / 2K, 5K, 10K Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 12: Features By Models

    Eco printing ● ● ● ● ● Wi-Fi Protected Setup ● (WPS) Duplex (2-sided) ● ● ● ● ● printing Samsung Easy Printer ● ● ● ● ● Driver Manager Memory ○ ○ ○ Tray 2 ○ ○ ○ ○...
  • Page 13 Up to 1,200 x 1,200 dpi effective output 2.1.3.2 Controller & S/W Item ML-331x series ML-371x series Processor Samsung 375 MHz Samsung 600 MHz Memory Std. 64 MB - 371xD : 64 MB - 371xND / 371xDW : 128 MB Max.
  • Page 14 SuSE 8.2~9.2 and SuSE 8.2~9.2 NetWare 5.x, 6.x (TCP/IP Only) NetWare 5.x, 6.x (TCP/IP Only) Unix HP-UX Unix HP-UX Wireless Protocol - 371xD / 371xND : N/A Network - 371xDW : 802.11n Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 15 - 371xD / 371xND : 8EA (5 Navigation - 331xND : 8EA (5 Navigation keys, ECO, keys, ECO, Power, Cancel) Power, Cancel) - 371xDW : 9EA (5 Navigation keys, ECO, WPS, Power, Cancel) Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 16: Paper Handling

    Ofi cio, Executive, ISO B5, JIS B5 Media types - 331xD : N/A Plain Paper, Thin, Thick, Recycled, Bond, - 331xND : Plain Paper, Thin, Thick, Cardstock, Archive Recycled, Bond, Cardstock, Archive Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 17 Yield 10K standard pages. Declared cartridge yield in accordance with ISO/IEC 19752. Electronic key(CRUM) Only Electronic key(CRUM) Only Life detect Toner gauge sensor by dot count Toner gauge sensor by dot count Yield Drum Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 18 Item Part Code Life Transfer roller JC66-02842A Approx. 100,000 Pages Fuser Unit JC91-01023A (110V) Approx. 90,000 Pages JC91-01024A (220V) Pick-up Roller JC73-00340A Approx. 90,000 Pages Retard Roller JC90-01032A Approx. 60,000 Pages Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 19 Wireless Network Hard Disk 2.1.3.8 Others Item ML-331x series ML-371x series Memory Upgradable Mem. Slot Upgradable Mem. Type SODIMM Upgradable Mem. Unit 256MB Sensor Paper Empty Paper Size Media Type Paper Full Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 20: Model Comparison Table

    - Ethernet 10/100/1000 Interface - Ethernet 10/100 Base - Ethernet 10/100/1000 - Ethernet 10/100 Base Base TX (371xND/DW) TX (331xND) Base TX (P2055dn) - Wireless LAN (371xDW) Noise 52dB 51dB 55dB 53dB 2-10 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 21: Product Description

    Control panel Multi-purpose tray Control board cover Multi-purpose tray paper extension Front cover Paper width guides on a multi-purpose tray Paper level indicator Output support Optional tray 2 a. Optional device. 2-11 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 22: Rear View

    2. Product specifi cations and descriptions 2.2.2 Rear View Network Port Power receptacle USB port Duplex unit Output 5V Rear cover Power Switch (Only Korea) a. Available only with models that support network connection. 2-12 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 23: Paper Path

    CÓPIA NÃO CONTROLADA 2. Product specifi cations and descriptions 2.2.3 Paper Path [1] Simplex [2] Duplex [3] MP 2-13 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 24: System Layout

    Frame, Feeding, Developing, Driving, Transferring, Fusing, Cassette and H/W comprising the main control board, power board, operation panel, PC Interface. Cassette Cartridge Duplex Regi roller Fuser Exit roller1 Feed roller Exit roller2 Pick up roller 2-14 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 25 The following is a diagram of the pickup section: Pickup Roller Pickup Roller Feed Roller Feed Roller Regi. Roller Regi. Roller Retard Roller Retard Roller 2-15 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 26 It is the same method with the main cassette, and the capacity is 520 sheets. It has a separate driving mechanism. It is designed for a common use with a main cassette. 2-16 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 27: Imaging Unit

    4. Transfer: The transfer rollers opposite the OPC drums transfer toner from the drums to the transfer media (e.g. paper, OHP fi lm, etc). 5. Cleaning for OPC drum: The cleaning blade removes remaining toners on the drum surface after image transfer to the paper. 2-17 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 28 • Classifying device for toner cartridge: ID is classifi ed by CRUM. ⓐ Charge Roller ⓕ Supply Roller Drum OPC Charge Cleaning Roller ⓑ ⓖ Cleaning Blade Agitator 1 ⓒ ⓗ Doctor Blade Agitator 2 ⓓ ⓘ ⓔ Developer Roller 2-18 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 29 Tefl on. When a paper passes between a heat roller and a pressure roller, toner adheres to the surface of a paper permanently. 5) Halogen Lamp - Voltage 120 V : 115 ± 5 % 220 V : 230 ± 5 % - Capacity : 850 Watt ± 25 W 2-19 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 30 /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. OPC Drum Photo Diode Polygon Mirror Polygon Motor Motor Driver LD Driver circit LD(Laser Diode) Protector panel 2-20 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 31: Hardware Con Guration

    The Main Controller receives print data from the host through network or USB Port. It takes this information and generates printable video bitmap data. Engine and Video Controller are not separated. 2-21 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 32 The OPE Controller displays the status of the system using 16 x 2line LCD in response to user actions or the Main controller. ML-331xD model only supports LED OPE without LCD module. The HVPS supplies high voltage for developing Process. High Voltage controlled by PWM signal from CPU.
  • Page 33 The Main Controller receives print data from the host through network or USB Port. It takes this information and generates printable video bitmap data. Engine and Video Controller are not separated. 2-23 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 34 The HVPS supplies high voltage for developing Process. High Voltage controlled by PWM signal from CPU. SMPS makes +5V and +24V DC from 220V or 110 AC. WLAN module is used for wireless communication. 2-24 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 35: Circuit Board Locations

    CÓPIA NÃO CONTROLADA 2. Product specifi cations and descriptions Circuit Board Locations The following diagrams show the locations of the printer circuit boards: HVPS ML-3310 Main Controller SMPS ML-3710 Main Controller 2-25 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 36: Main Controller

    - Ethernet PHY : Network printing - Serial Flash : Program memory ML-331xD : 8MB, ML-331xND : 16MB The Main Controller manages an Electro-photography system, controls the Video Data of printing images from Main Board to LSU, provides high-voltages and PWMs, adjusts temperature in the fusing system, reads sensor signals and controls SCF option.
  • Page 37 Outbin Full Sensor & Rear Cover SMPS Power ERASER DEBUG USB Device Parallel Option DC supply jack FAN MAIN Exit Sensor ● Information - SEC-CODE : JC92-02329A - PBA Name : PBA-MAIN 2-27 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 38 Main Board to LSU, provides high-voltages and PWMs, adjusts temperature in the fusing system, reads sensor signals and controls SCF option. The Main controller also controls OPE and Giga N/W PHY, USB Device, Wireless Module. [ Main Controller Diagram ] 2-28 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 39 Exit Sensor Air temperature FAN SMPS Main Motor & Clutch JTAG SMPS Signal SMPS Power ● Information FAN MAIN DDR2 SODIMM - SEC-CODE : JC92-02343A - PBA Name : PBA-MAIN 2-29 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 40 ML-3710D model OPE is composed of LEDs and KEYs without LCD. Diagram of OPE Controller OPE Controller PBA ● Information ● Information - SEC-CODE : JC92-02341A - SEC-CODE : JC92-02342A - PBA Name : OPE-LCD - PBA Name : OPE-LED 2-30 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 41 The Wireless LAN Module supports 802.11b/g/n at only 371xDW model via USB 2.0 high speed. The Module is installed at the USB Host Channel of Main Controller PBA. ● Information - SEC-CODE : JC92-02364A - PBA Name : PBA-WNPC 2-31 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 42 2.2.5.6 CRUM PBA ML-3X10 series use same CRUM PBA as ML-1660. CRUM PBA use I2C communication with main Controller. ● Information - SEC-CODE : JC92-02055B - PBA Name : PBA-CRUM 2-32 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 43 PBAs(OPE, HVPS, SMPS). The Main Controller contains various types of connectors, to deliver electronic signals through signal wires. The signal wires provide electronic control signals that are used for starting and stopping the motors, operating clutches, sensing the unit state, etc. 2-33 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 44 -.+24V : 1.8A INPUT_AC 3) Output Power: Fuser_AC Output -.+5V : 8.16W SMPS Control Signal (from Engine PBA) -.+24V : 43.2W 5) Heat Lamp Capacity : 850W OUTPUT_5V&24V (to DC POWER PBA) 2-34 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 45 This board generates high-voltage channels which includes MHV, DEV, BLADE, SUPPLY, OPC, THV and FUSER BIAS. ● Connection Main Interface SUPPLY(-489V) MHV(-1240V) OPC(-51V) DEV(-338V) THV(+1315V, -1000V) BLADE(-389V) FUSER BIAS(240V) ● Information - SEC-CODE : JC44-00197A - PBA Name : HVPS 2-35 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 46 CÓPIA NÃO CONTROLADA 2. Product specifi cations and descriptions 2.2.5.10 Electrical Parts Location 1) Sensors Cassette paper empty sensor Feed sensor MP paper empty sensor Exit sensor Regi sensor Outbin full sensor 2-36 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 47 CÓPIA NÃO CONTROLADA 2. Product specifi cations and descriptions 2) Motor and clutch Main motor Cassette Pick up clutch Regi clutch MP Pick up clutch 2-37 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 48 CÓPIA NÃO CONTROLADA 2. Product specifi cations and descriptions 3) Fan Main fan SMPS fan 2-38 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 49: Engine F/W Control Algorithm

    AD converter. The voltage value for impressing to the transfer roller is decided by the changed value. 2-39 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 50 Also, the engine informs the error status of the main system. And then the error message is displayed at LCD window or LED to inform the error status of the user. 2-40 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 51 The engine mode is changed to recovery mode and the engine informs the main system of the engine mode. And the engine checks the LSU error. If the error doesn’t happen, the printing job. 2-41 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 52: S/W Descriptions

    (PCL, PS, GDI, etc.) to be able to make the user to take same output as originally one what composed in Host. 2. Kernel that control and management the whole procedure include of Control fl ow and Printing Job before transfer to Engine system. 2-42 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 53 Network Interface Card,(this is, at fi rst, make communication logical port, manage the data, transfer them from spooler to network port, and offer the result of printing). 2-43 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 54 Kernel sends the output bit-map data to Engine using Printer Video Controller (by clock type for LSU). - Engine print the received data to required paper with the sequential developing process. 2-44 Service Manual Samsung Electronics ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 55: Disassembly And Reassembly

    3. Unplug the power cord. 4. Use a at 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 position. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 56: Screws Used In The Printer

    FRAME-ETC SCREW-TAPTYPE;BH,+,-,B,M3,L6,ZPC(WHT),SWRCH18A,- 6003-000301 SCREW-TAPTYPE;BH,+,S,M4,L6,ZPC(WHT),SWRCH18A 6006-001078 FRAME-ETC SCREW-TAPTYPE;PH,+,WSP,B,M3,L10,ZPC(WHT),SWRCH18A 6003-000282 SCREW-TAPTYPE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- 6003-000196 COVER-TOP SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 6003-000196 COVER-FRONT SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 6003-000264 MP GUIDE-TRAY SCREW-TAPTYPE;PWH,+,-,B,M3,L6,ZPC(WHT),SWRCH18A,- 6003-000282 CARTRIDGE-TONER SCREW-TAPTYPE;BH,+,-,B,M3,L8,ZPC(BLK),SWRCH18A,- 6003-000196 SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A 6003-000196 MAINLINE SCREW-TAPTYPE;PWH,+,B,M3,L10,NI PLT,SWRCH18A Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 57: Disassembly Procedure

    1. Remove the cassette. 3. Remove the front cover by releasing both hooks. 2. Open the front cover. Remove the toner 4. To remove the toper cover, rst, remove cartridge. 2 screws. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 58 5. Open the rear cover. Remove 2 screws. 7. Lift up and release the top cover. Hook Hook 6. Unplug a connector on the main board. 8. Close the rear cover. Remove the duplex unit. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 59 9. Remove the rear cover by releasing both hooks. 11. Remove 1 screw. Remove the right cover by releasing hooks. Hook Hook 10. Remove the left cover by releasing hooks. Hook Hook Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 60: Main Board

    4. Release the main board. 3.3.3 HVPS board 1. Remove the right cover. (Refer to 3.3.1 Cover) 2. Remove 5 screws. 3. Unplug all connectors on the HVPS board. 4. Release the HVPS board. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 61: Smps Board

    4. Release the SMPS board. 3.3.5 Laser Scanning Unit (LSU) 1. Remove the top cover. (Refer to 3.3.1 Cover) 2. Unplug 2 at cables from the LSU. 3. Remove 3 screws. 4. Release the LSU. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 62: Fuser Unit

    When reassembling the fuser unit, do not forget to tighten these screws. 5. Release the fuser unit. Frame-Rear Frame-Rear 2. Remove the Frame-Rear by releasing both hooks. Exit sensor holder Exit sensor holder Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 63: Main Drive Unit

    5. Release the main drive unit. Bar coupler Bar coupler 3. Remove the main drive unit after removing 6 screws. NOTE When reassembling the main drive unit, tighten 6 screws in order as shown above. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 64: Feed Drive Unit

    2. Release the feed drive unit after removing 2 screws. 3.3.9 Pick up/ Regi/ MP clutch 1. Remove the feed drive unit. 2. For the clutch to require replacement, unplug the connector then replace it. Regi. Regi. Pick-up Pick-up 3-10 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 65: Pick Up Roller

    3. Push the transfer roller holder to the center and release it. 2. Release the LSU bracket after removing 4 screws. 4. Remove the transfer roller. Transfer roller Transfer roller 3-11 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 66: Mp Unit

    1. Remove the front / top / right cover. 3. Separate the MP lower from the MP upper. 2. Remove 4 screws. MP pick up/ forward roller MP pick up/ forward roller MP retard roller MP retard roller 3-12 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 67: Ope Board

    2. Release the OPE board after removing 4 screws. 3.3.14 Bin-full sensor 1. Remove the top / left cover. (Refer to 3.3.1 Cover) 2. Release the bin-full sensor after unplugging the connector. 3-13 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 68: Regi. / Feed / Empty Sensor

    2. Remove the PLATE-FRAME BOTTOM after removing 4 screws. Regi. sensor Regi. sensor Feed sensor Feed sensor 5. Remove the sensor cover after removing 2 screws. 3. Remove the sensor cover after removing 2 screws. 3-14 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 69: Cassette Roller (Retard Roller)

    6. Unplug the connector then release the empty sensor. Empty sensor Empty sensor 3.3.16 Cassette roller (Retard roller) 1. Remove the cassette. 3. Release the Retard roller. 2. Open the COVER-CASSETTE. 3-15 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 70: Alignment And Troubleshooting

    You can turn the power on and off with this button. (Power) Shows the status of jam occurance of your machine. (Jam LED) Shows the status of your machine. (Status LED) Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 71 Shows the status of your machine. (Status LED) Shows the status of jam occurance of your machine. (Jam LED) Navigates available values by moving to the next or previous options. Arrows Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 72 If your wireless access point supports Wi-Fi Protected Setup™ (WPS), you (WPS) can con gure the machine easily without a computer. Navigates available values by moving to the next or previous options. Arrows Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 73: Understanding The Status Led

    Some amount of toner may remain in the cartridge even when red LED is on and the printer stops printing. b. Wireless model only Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 74: Jam Removal

    3. Remove the jammed paper by gently pulling it you do not see the paper in this area, stop and straight out. go to the next step. 3. Pull tray 1 half-way out. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 75 1. If the paper is not feeding properly, pull the paper out of the machine. 5. Insert the trays back into the machine. Printing automatically resumes. 2. Open and close the top cover to resume printing. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 76 4. Remove the jammed paper as shown in the following gure. 3. Replace the toner cartridge and close the front cover. fuser door Printing automatically resumes. 5. Close the rear cover. Printing automatically resumes. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 77 Insert the duplex unit into the machine. If you still do not see the paper, go to the next step. 3. Open the rear cover. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 78: Useful Menu Item For Service

    • TonerLow Alert : If toner in the cartridge has run out, a message informing user to change the toner cartridge appears. You can set the option for this message to appear or not. Samsung Electronics Service Manual ML-331x/371x series...
  • Page 79 2. Double-click the Smart Panel icon on the Noti cation Area in Linux. You can also click Smart Panel on the status bar in Mac OS X. For Windows user, select Start > Programs or All Programs > Samsung Printers > Samsung Easy Printer Manager.

  • Page 80: Periodic Defective Image

    26.7 mm Black spot Developer roller 36.78 mm Horizontal band Toner cartridge OPC drum 75.49 mm White and Black spots Supply roller 69.57 mm Horizontal band Transfer roller Ghost, Damaged image 4-11 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 81: Using The Easy Printer Manager Program And Smart Panel

    This interface is intended to be used by general device users in a small business or small home of ce environment. For Windows user, select Start > Programs or All Programs > Samsung Printers > Samsung Easy Printer Manager. The Easy Printer Manager interface is comprised of various basic sections as described in the table that follows.
  • Page 82 Smart Panel is a program that monitors and informs you of the machine’s status, and allows you to customize the machine’s settings. For Macintosh, Smart Panel is installed automatically when you install the machine software. For Linux, you can download Smart Panel from the Samsung website. Smart Panel overview You can view the level of toner remaining in each toner cartridge.

  • Page 83: Updating Firmware

    3. Turn the machine on. Check if the printer is the ready status. 4. Drag the rmware le and Drop down on the usblist2.exe. And then rmware update will be started automatically. 5. When upgrading is completed, machine is automatically re-booting. 4-14 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 84 - Firmware le to upgrade [Upgrade Procedure] 1. Open Web-browser and input IP address of machine. Click “Login”. 2. Log-in Admin Mode ID: admin, PW: sec00000 3. Select Maintenance menu and click “upgrade wizard” 4-15 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 85 4. Select rmware le using “browser” button and press next button. 5. SyncThru will check verify rmware le and compare version and press next button. 6. Machine starts upgrading. SyncThru will return home page after upgrading is completed. 4-16 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 86: Tech Mode

    In service (tech) mode, the technician can check the machine and perform various test to isolate the cause of a malfunction. While in Tech mode, the machine still performs all normal operations. NOTE - There is no tech mode for LED type model (ML-331xD,371xD) To enter the Tech Mode To enter the Tech Mode, press “...
  • Page 87 EDC Mode NVM Read Write 103-Time 105-Duty 106-Deve 107-Transfer 109-Temp Offset 110-LD Power NVM Initialize Initialize Now Test Routines 100-Motor 101-Clutch 102-Sensor 105-MHV Bias 106-Dev Bias 107-Transfer Bias 109-Fuser Heater 112-ACR 4-18 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 88 Job Duty Report It shows printing usage by print job duty. Density Report It shows image density control history. Usage Counter It contains the total number of pages printed. 4-19 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 89 Engages T2 pick up clutch from tray 2. On[Off] Engine (Optional) 101-0050 Registration Clutch Engages drive to registartion roller. On[Off] Engine 101-0190 Out-Bin Full Sensor Detect when a paper is at Duplex Ready sensor. High[Low] Engine 4-20 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 90 LSU Motor1 Run Ready Detects if LSU motor1 runs at normal speed. High[Low] Engine 110-0060 LSU Motor1 Run LSU Motor1 On/Off On[Off] Engine 110-0110 LSU LD Power4 LSU LD4 Power On/Off (black) On[Off] Engine 4-21 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 91: Troubleshooting

    Red LED on / See the troubleshooting OPE LED Error message for error code Green OK? is displayed. Print(test pattern) printing Refer to "Solution Quality is of Image Problem" Nomal? 4-22 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 92: Basic Check List

    6. Check consumables (toner etc.). • Using the keys print the Test Pattern. --> Expected life of various consumable parts, compare this with the gures printed and replace as required 4-23 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 93: Initial Inspection

    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. 4-24 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 94: Error Message And Troubleshooting

    Error #U1-2330 Turn off then on. 38 page U1-2340 Error #U1-2340 Turn off then on. 39 page U2-1111 Error #U2-1111 Turn off then on. 40 page U2-1113 Error #U2-1113 Turn off then on. 4-25 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 95 3. The main BLDC motor is defective. - Unplug the connector from the motor carefully. - Replace the main BLDC motor with new one. 4. If the problem persists, replace the main board. 4-26 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 96 1. Print the supply information report. Check the life remaining of the toner cartridge. If its life is at the end, turn the machine off and replace the toner cartridge with new one. 4-27 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 97 Toner cartridge is not compatible. ● Troubleshooting method 1. Print the supply information report. Check information of the toner cartridge. 2. If the toner cartridge is not a Samsung genuine toner cartridge, replace with new one. 4-28 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 98 2. If the Actuator-Paper Empty is defective, replace it. 3. If the Photo Sensor is defective, replace it. Check if the connector is connected properly. 4. If the problem persists, replace the Main Board. 4-29 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 99 The feed roller should be especially checked. 4. Print out the Supplies Information. Check the Tray Roller Life and Tray Torque Limiter Life. If the life came to the end, replace the relative roller. 4-30 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 100 3. If the Photo Sensor is defective, replace it. Check if the connector is connected properly. Empty Empty actuator actuator Empty sensor Empty sensor 4. If the problem persists, replace the Main Board. 4-31 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 101 3. If the Photo Sensor is defective, replace it. Check if the connector is connected properly. Empty Empty actuator actuator Empty sensor Empty sensor 4. If the problem persists, replace the Main Board. 4-32 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 102 3. Check if the Regi roller is contaminated or worn out. If yes, replace it. 4. Check if there is any obstacles or contamination in the paper path. If yes, clean or remove it. 4-33 Samsung Electronics Service Manual ML-331x/371x series...
  • Page 103 1. Remove the jammed paper. 2. Remove the contamination or obstacles in the paper path. 3. Adjust the paper guide properly. 4. Check if the exit sensor is assembled properly. Reassemble it. 4-34 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 104 1. Remove the paper on the output tray. (The maximum loading capacity is 150 sheets based on standard paper(80g/m2).) 2. Check if the Bin-full Sensor connector is connected properly. Reconnect it or replace the Bin-full sensor. 4-35 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 105 3. Check if the connection between the main board and HVPS board is correct. 4. Check if the cover open switch on HVPS board is operated properly. If it is defective, replace the HVPS board. Cover Open Switch Cover Open Switch 4-36 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 106 - The con rmation protocol is not the same or user information (ID/Password) is wrong. ● Troubleshooting method Check the setting-up for 802.1x con rmation server. - Re-enter the server information and con rmation protocol. - Re-enter the user information. 4-37 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 107 2. If the problem persists, turn the machine off and remove the fuser unit. a. Check if the fuser connector is connected properly. b. Check if the input voltage is normal. c. Check if the thermistor is twisted or contaminated. 4-38 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 108 2. If the problem persists, turn the machine off and remove the fuser unit. a. Check if the fuser connector is connected properly. b. Check if the input voltage is normal. c. Check if the thermistor is twisted or contaminated. 4-39 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 109 5. Reconnect the LSU harness and then execute the LSU motor test again. 6. If the problem persists, replace the LSU. 7. If the problem persists after replacing LSU, replace the main board. 4-40 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 110: Image Quality Problem

    2. Scratched surface of the charge roller in the toner cartridge. 3. Partly depression or Replace the transfer roller if deformation on the surface of occurred as No. 3. the transfer roller. 4-41 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 111 Remove if top of a black image. found. 5. It may occur when foreign If the problems are not solved, substances are on the OPC Drum. replace the toner cartridge. 4-42 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 112 Developer roller = 36.78 mm 2. If the malfunction persists, OPC drum = 75.49 mm OPC drum = 75.49 mm replace the developer. Supply roller = 69.57 mm Supply roller = 69.57 mm 4-43 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 113 5. Clean the inside of the set against the paper particles and foreign matter in order not to cause the trouble. 4-44 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 114 1. Clean up the contaminated area by the toner. 2. Replace the HVPS if the 4. Abnormal output from the HVPS. problems are not solved by the above four directions. 4-45 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 115 LSU? -> Replace toner cartridge The power of LSU is set high or internal problem -> Replace LSU or adjust volume 4-46 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 116 2. The toner level is not Replace the toner cartridge. even on the developer roller due to the bad blade. 4-47 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 117 Clean the bushing part of the 4. Is the movement(Up and Down) transfer roller. of the transfer roller smooth? If the problem is still not solved, 5. Is the HVPS normal? replace the toner cartridge. 4-48 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 118 4. Transfer roller lifetime check the transfer roller lifetime (50.000 sheets) has expired. and replace it. 5. Abnormal low temperature Wait about 1 hour after power on (below 10 ). before using printer. 4-49 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 119 . 2. If the transfer roller is If the transfer roller is contaminated, contaminated, stains on the face of print the 2~3 blank pages. page will occur . 4-50 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 120 Disassemble the fuser and clean the H/R(Heat Roller) and P/R 2. Pressure roller is contaminated. (Pressure roller). And check the area between H/R and Thermistor. If contaminated, clean the area not to be deformed. 4-51 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 121 The mirror in LSU might be misplaced so the light path to the OPC deviates ->Repair or replace LSU or remove any defective matters in the machine 4-52 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 122: Other Errors

    (the solenoid does not work properly) Replace the solenoid if necessary. 2. Pick up/Retard/Forward Clean the contaminated roller with roller are contaminated with soft cloth with Isopropyl Alcohol. foreign matter. 4-53 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 123 SMPS output are normal. 1. Reconnect the OPE harness. 2. Check if the OPE connector is 2. Replace the OPE harness or connected properly. OPE harness or OPE board. OPE board is defective. 4-54 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 124: Network Problems

    B. Auto IP address : DHCP is on as default. 3. Protocol Enable / Disable, Port Number (In SWS) 4. IP ltering On/Off 5. SNMP community name check (When SNMP no response) 4-55 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 125: Factory Default

    1. Network Value changed to default value A. Some of Network value will not be changed immediately. B. Factory default operation will be done after Power Off / Power On 4-56 Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 126: System Diagram

    CÓPIA NÃO CONTROLADA 5. System Diagram 5. System Diagram 5.1 Block Diagram(ML-331x series) Navi_KEY Cancel Power Status_LED Cancel Power Status_LED Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 127: Block Diagram

    CÓPIA NÃO CONTROLADA 5. System Diagram Block Diagram(ML-371x series) Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 128 CÓPIA NÃO CONTROLADA 5. System Diagram 5.2 Connection Diagram(ML-371x series) Navi_KEY Cancel Power Status_LED Cancel Power Status_LED CN13(2mm) HVPS CN20 CN11 CN15(2mm) CN14 (2mm) MAIN FAN SMPS FAN SMPS SMPS CRUM Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 129: Connection Diagram

    CÓPIA NÃO CONTROLADA 5. System Diagram Connection Diagram(ML-371x series) Navi_KEY Cancel Power Status_LED CN3(2mm) HVPS CN12 CN21 CN15(2mm) CN13 (2mm) MAIN FAN CRUM SMPS FAN SMPS SMPS Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 130: Reference Information

    Standard : For general use • Tweezers Standard : For general home use, small type. • Software (Driver) installation CD ROM • Cotton Swab Standard : For general home use, for medical service. Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 131: Acronyms And Abbreviations

    CRU Memory IMAP Internet Message Access Protocol Center Ware Internet Printing Protocols CWDP Center Ware Device Discovery Images Per Minutes Software(Samsung equivalent of Internetwork Packet Exchange Samsung’s SyncThru) Image Quality CWIS Center Ware Internet Services International Telecommunication Union DADF Duplex Auto Document Feeder...
  • Page 132 PS/3 PostScript Level-3 USDR Un-Shut Down Rate(=NSDR) Printing Video Controller in the XCMI Samsung’s Management Information SPGPm(Graphic Processor for Printer) Base Quality, Cost, and Delivery Warranty Action Remote Control Panel W x D x H Width x Depth x Height...

  • Page 133: Service Parts

    ELA=Electrical Assembly, HOU =Housing MEA UNIT-COVER PA EXIT ASS’Y MEA= Mechanical Assembly, PA=Paper PMO-TRAY EXTENTION MP NE PMO= Processing Mold MP=Multi-Purpose(Bypass) tray NE=for NEC (common as Samsung Halk printer) MEC-CASSETTE ASS’Y(LETTER) MEC = Mechanic Combined unit COVER-M-FRONT M=Mold MPR-NAME/PLATE MPR= Machinery Press,...
  • Page 134 CS= Compress GEAR-MP/DUP DRV MP =Multi-Purpose (Bypass) tray DUP DRV = Duplex Driver IPR-BRKT G DUPI PR=Iron Press BRKT=BRACKET G= Ground UP=Duplex PMO-BUSHING TX(B4) TX=Transmit PMO-TRAY CASE, MP MP=Multi-Purpose tray(Bypass tray) Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...
  • Page 135 PBA SUB-MP-SEN =>Sub Printed circuit Board Assembly for the MP-SEN(= Multi-Purpose (Bypass) tray-Sensor) A/S MATERAL-PICKUP,MP FOOT-ML80 HOLDER CATCH CST MC2 MC2=>McKInley2 (Samsung Project code name) IPR-GROUND PLATE A(OPC) OPC=Organic Photo-Conductive ELA M/M-AUD SPEAKER ELA M/M => Electrical Assembly M/M AUD=Audio...
  • Page 136 PBA SUB-REGI => Sub Printed circuit Board Assembly for the Registration GROUND-P_SCAN ROLLER GROUND-P =Ground-Press IPR-GUARD C/O S/W C/O = Cover Open S/W= Switch MEA UNIT-TX STACKER TX =Transmit IPR-WASHER SPRING CU CU=Curve Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 137: A4 Iso 19752 Standard Pattern

    The life of the toner cartridge and the printing speed are measured using the pattern shown below. (The image is 70% of the actual A4 size). 6.3.1 A4 ISO 19752 Standard Pattern This test page is reproduced at 70% of the normal A4 size Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

  • Page 138: Selecting A Location

    • Front: 482.6 mm (enough space so that the paper tray can be removed) • Back: 180 mm (enough space for ventilation) • Right: 100 mm (enough space for ventilation) • Left: 100 mm (enough space for ventilation) Samsung Electronics Service Manual ML-331x/371x series CÓPIA NÃO CONTROLADA...

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