chapter 1 Precautions 1.1 Safety Warning ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 1-1 1.2 Caution for safety ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ

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13Service Manual Mono Laser MFP SCX-4600/SCX-4623 series SCX-4600/4623F/FN/FW The keynote of Product 1. Print / Copy Speed 6ヲ1 22 ppm in letter 2. Processor 6ヲ1 Jupiter5 375 Mhz 3. Printer Language Emulations 6ヲ1 SPL, PCL-5 (4623FW) 4. Memory 6ヲ1 64 MB (4600/4623F) 6ヲ1 128 MB (4623FN) 6ヲ1 256MB (4623FW) 5. Interfaces 6ヲ1 One USB port 6ヲ1 One 10/100 Base TX network connector (4623FN) 6ヲ1 One 802.11b/g/n wireless module (4623FW) 6. Toner cartridge 6ヲ1 Initial : 0.7K / 1K 6ヲ1 Sales : 1.5K / 2.5K two types 7. ADF (4623 series)

chapter 1 Precautions 1.1 Safety Warning ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 1-1 1.2 Caution for safety ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 1-2 1.2.1 Toxic material ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 1-2 1.2.2 Electric Shock and Fire Safety Precautions ュ ュ ュ ュ ュ ュ ュ 1-2 1.2.3 Handling Precautions ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 1-3 1.2.4 Assembly / Disassembly Precautions ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 1-3 1.2.5 Disregarding this warning may cause bodily injury ュ ュ ュ ュ 1-4 1.3 ESD Precautions ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 1-5 chapter 2 Product Overview 2.1 Product Specifications ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-1 2.1.1 Product Overview ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-1 2.1.2 Specifications ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-2 2.1.3 Model Comparison Table ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-9 2.2 System Overview ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-10 2.2.1 Front View ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-10 2.2.2 Rear View ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-11 2.2.3 System Layout ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-12 2.2.4 Engine H/W Specifications ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-19 2.2.5 Engine F/W Contol Algorithm ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-28 2.2.6 S/W Descriptions ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 2-30 chapter 3 Maintenance and Disassembly 3.1 Precautions when replacing parts ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-1 3.1.1 Precautions when assembling and disassembling ュ ュ ュ ュ 3-1 3.1.2 Preautions when handling PBA ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-1 3.1.3 Releasing Plastic Latches ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-1

3.2 Screws used in the printer ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-2 3.3 Cover ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-4 3.3.1 Front Cover ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-4 3.3.2 Rear Cover ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-4 3.3.3 Right/Left Cover ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-5 3.4 Scanner and ADF ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-6 3.4.1 ADF unit ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-6 3.4.2 ADF roller ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-7 3.4.3 OPE Unit ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-8 3.4.4 Platen unit ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-8 3.4.5 CIS unit ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-9 3.5 Middle Cover ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-10 3.6 Fuser Unit ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-12 3.6.1 Whole Fuser Unit ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-12 3.6.2 Main Service parts of Fuser Unit ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-13 3.6.3 Replacing the Main Service part of Fuser Unit ュ ュ ュ ュ ュ 3-15 3.7 LSU ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-22 3.8 Main PBA ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-24 3.9 Drive unit ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-25 3.10 Solenoid ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-26 3.11 FAN ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-26 3.12 Transfer Roller ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-27 3.13 SMPS/HVPS board ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-28 3.14 Pick up roller ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-30 3.15 Cassette holder pad ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-30 3.16 Wireless LAN PBA (Only SCX-4623FW) ュ ュ ュ ュ ュ ュ ュ ュ ュ 3-31 chapter 4 Alignment and Troubleshooting 4.1 Alignment and Adjustments ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-1 4.1.1 Control Panel ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-1 4.1.2 Understanding the Status LED ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-4 4.1.3 JAM Removal ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-4

4.1.4 Paper Path ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-10 4.1.5 Menu Map ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-11 4.1.6 Tech Mode ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-12 4.1.7 EDC Mode ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-19 4.1.8 Firmware Upgrade ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-22 4.1.9 Periodic Defective Image ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-23 4.1.10 Error Message ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-24 4.2 Troubleshooting ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-28 4.2.1 Procedure of Checking the Symptoms ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-28 4.2.2 The cause and solution of Bad image ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-29 4.2.3 The cause and solution of the bad discharge ュ ュ ュ ュ ュ ュ 4-45 4.2.4 The cause and solution of the malfunction ュ ュ ュ ュ ュ ュ ュ 4-52 4.2.5 The cause and solutions of bad environment of the software ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-61 4.2.6 Fax & Phone Problems ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-64 4.2.7 Copy Problems ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-73 4.2.8 Scanning Problems ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-77 4.2.9 Fuser Problems and solutions ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4-80 chapter 5 System Diagram 5.1 Block Diagram ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 5-1 5.2 Connection Diagram ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 5-2 FW Connection Diagram ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 5-3 chapter 6 Reference Information 6.1 Tool for Troubleshooting ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 6-1 6.2 Acronyms and Abbreviations ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 6-2 6.2.1 Acronyms ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 6-2 6.2.2 Service Parts ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 6-4 6.3 The Sample Pattern for the Test ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 6-8

6.3.1 A4 ISO 19752 Standard Pattern ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 6-8 6.4 Selecting a location ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 6-9 attached Exploded Views & Parts List-OK

13Alignment and Troubleshooting 4. Alignment and Troubleshooting 4.1 Alignment and Adjustments This chapter describes the main functions for servicing the equipment, such as the product maintenance method, image quality proper repair procedures, jam removal procedures, and so on. 4.1.1 Control Panel SCX-4623 Series This control panel may differ from your machine depending on its model. 1 ID Copy 2 WPS You can copy both sides of an ID Card such as a driver ッs license to a single side of paper. If your wireless access point supports Wi-Fi Protected Setup6セ4(WPS), you can configure the machine easily without a compurter. 3 Display Shows the current status and prompts during an operation. 4 Wireless Shows the status of wireless network. When the LED on, the machine is connected wirelessly. 5 Status Shows the status of your machine. 6 (Fax) Activates fax mode. 7 (Copy) Activates copy mode. 8 (Scan) Activates scan mode. 9 Arrow Scroll through the options available in the selected menu, and increase or decrease values. Service Manual 4-1 Samsung Electronics

13Parts Catalog - S ries ExplodedView and Parts List Contents Power Cord ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 4 Thumbnail ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 5 1. MAIN ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 7 2. COVER ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 9 3. COVER-MIDDLE ASSY ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 11 4. COVER FRONT ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 13 5. COVER REAR ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 15 6. FRAME BASE-LOWER ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 17 7. DRIVE MAIN-BRACKET ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 21 8. FRAME BASE-PICK UP ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 23 9. FUSER ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 25 10. CASSETTE ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 27 11. SCANNER_4 in 1 ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 29 12. SCANNER_3 in 1 ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 31 13. COVER-PLATEN ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 33 14. OPE_4 in 1 ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 35 15. OPE_3 in 1 ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 37 16. PLATEN-LOW END ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 39 17. PLATEN-LOWER_4 in 1 ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 41 18. PLATEN-LOWER_3 in 1 ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 43 19. PLATEN-UPPER_4 in 1 ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 45 20. PLATEN-UPPER_3 in 1 ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 47 21. PLATEN-SHEET ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 49 22. ASSY_ADF_BASE ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 51 23. ASSY-INPUT-TRAY ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 53 24. ASSY_ADF_COVER ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 55 25. ASSY_PAPER-PATH ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 57 26. ASSY_DRIVING_MODULE ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ ュ 59 cs Service Manual Electronics Service Manual 3