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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) - 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

1. Precautions 1.1 Safety Warning 1-1 1.2 Caution for safety 1-2 1.3 ESD Precautions 1-5 2. Product spec and feature 2.1 Product Specifications 2-1 2.1.1 Product Overview 2-1 2.1.2 Specifications 2-1 2.1.3 Model Comparison Table 2-7 2.2 Summary of Product 2-9 2.2.1 Printer Components 2-9 2.2.2 System Layout 2-12 2.2.3 Engine H/W Specifications 2-17 2.2.4 S/W Descriptions 2-27 3. Disassembly and Reassembly 3.1 General Precautions on Disassembly 3-1 3.2 Used Screw List 3-2 3.3 Cover Unit 3-3 3.3.1 CASSETTE & Front Cover 3-3 3.3.2 DUPLEX UNIT & COVER-TOP/COVER-REAR 3-4 3.3.3 Cover-Side-LEFT/RIGHT 3-5 3.4 Fuser Ass'y 3-6 3.5 LSU(Laser Scanning Unit) 3-7 3.6 Drive Ass'y 3-8 3.7 Main PBA/SMPS/HVPS 3-9 3.8 HOLDER-PAD Disassembly 3-10 3.9 Transfer Roller 3-11 4. Alignment & Troubleshooting 4.1 Alignment and Adjustments 4-1 4.1.1 Sample Pattern 4-1 4.1.2 Control Panel 4-4 4.1.3 Consumables and Replacement Parts 4-7 4.1.4 LED Status Error Message 4-7 4.1.5 Abnormal Image Printing and Defective Roller 4-8 4.1.6 How to use DCU 4-9 4.1.7 Paper Jam 4-15 4.1.8 Download & Reset F/W 4-20 4.2 Troubleshooting 4-21 4.2.1 Procedure of Checking the Symptoms 4-21 4.2.2 The cause and solution of Bad image 4-22 4.2.3 The cause and solution of the bad discharge 4-38 4.2.4 The cause and solution of the malfunction 4-46 4.2.5 Toner Cartridge Service 4-56 4.2.6 The cause and solutions of bad environment of the software 4-58 5. Exploded Views & Parts List 5.1 Main 5-2 5.2 Top Cover 5-4 5.3 Cover Ass'y 5-6 5.4 Front Cover 5-8 5.5 Rear Cover 5-10 5.6 Frame 5-12 5.7 Main Drive 5-17 5.8 Rear Guide 5-19 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 6-1 6.2 Connection Dia ram 6-2 7. Reference Information 7.1 Tool for Troubleshooting 7-1 7.2 Acronyms and Abbreviations 7-2 7.3 Select a location for the Printer 7-4 7.4 Sample Tests Patterns 7-5 7.5 LAN (Optional Function) 7-6 7.6 Information of model's code 7-6 7.7 Parts Life Cycle Maintenance Table 7-7 7.7.1 Parts Life Cycle Maintenance Table 7-7 7.7.2 Toner Cartridge Criterion 7-7 7.8 Model Information 7-8 7.8.1 Understanding for Model Code 7-8 7.8.2 Understanding Material Code & Name 7-9