This manual consists of the following chapters: CHAPTER 1: GENERAL Features, specifications, etc. CHAPTER 2: INSTALLATION AND BASIC OPERATION Installation conditions, Installation procedures, basic operation of the printer etc. CHAPTER 3: THEORY OF OPERATION Basic operation of the mechanical system, the electrical system and the electrical circuits and their timing information. CHAPTER 4: DISASSEMBLY AND RE-ASSEMBLY Procedures for disassembling and re-assembling the mechanical system. CHAPTER 5: MAINTENANCE Periodical replacements parts, consumable parts, etc. CHAPTER 6: TROUBLESHOOTING Reference values and adjustments, troubleshooting image defects, troubleshooting malfunctions, etc. APPENDICES : Serial No. descriptions, Drum life & page counter, Diameter / circumference of rollers, Connection diagrams, PCB circuit diagrams, etc.

CHAPTER 1: GENERAL Features, specifications, etc. CHAPTER 2: INSTALLATION AND BASIC OPERATION Installation conditions, Installation procedures, basic operation of the printer etc. CHAPTER 3: THEORY OF OPERATION Basic operation of the mechanical system, the electrical system and the electrical circuits and their timing information. CHAPTER 4: DISASSEMBLY AND RE-ASSEMBLY Procedures for disassembling and re-assembling the mechanical system. CHAPTER 5: MAINTENANCE Periodical replacements parts, consumable parts, etc. CHAPTER 6: TROUBLESHOOTING Reference values and adjustments, troubleshooting image defects, troubleshooting malfunctions, etc. APPENDICES : Serial No. descriptions, Drum life & page counter, Diameter / circumference of rollers, Connection diagrams, PCB circuit diagrams, etc.

This service manual contains basic information required for after-sales service of the laser printer (hereinafter referred to as this machine or the printer). This information is vital to the service technician to maintain the high printing quality and performance of the printer. This service manual covers the HL-1030/1240/1250/1270N printers. This manual consists of the following chapters: CHAPTER 1: GENERAL Features, specifications, etc. CHAPTER 2: INSTALLATION AND BASIC OPERATION Installation conditions, Installation procedures, basic operation of the printer etc. CHAPTER 3: THEORY OF OPERATION Basic operation of the mechanical system, the electrical system and the electrical circuits and their timing information. CHAPTER 4: DISASSEMBLY AND RE-ASSEMBLY Procedures for disassembling and re-assembling the mechanical system. CHAPTER 5: MAINTENANCE Periodical replacements parts, consumable parts, etc. CHAPTER 6: TROUBLESHOOTING Reference values and adjustments, troubleshooting image defects, troubleshooting malfunctions, etc. APPENDICES : Serial No. descriptions, Drum life & page counter, Diameter / circumference of rollers, Connection diagrams, PCB circuit diagrams, etc.

PARTS REFERENCE LIST CONTENTS 1. FRAME / DRIVE UNIT .......................................................................... 1 2. LASER UNIT......................................................................................... 1 3. PAPER FEEDER .................................................................................. 3 4. FIXING UNIT......................................................................................... 5 5. PAPER CASSETTE......................................................................... 7AB 6. COVERS............................................................................................... 9 7. MAIN PCB........................................................................................... 11 8. ENGINE PCB...................................................................................... 13 9. LOW-VOLTAGE POWER SUPPLY PCB............................................ 13 10. HIGH-VOLTAGE POWER SUPPLY PCB........................................... 15 11. AC CORDS......................................................................................... 15 12. ACCESSORIES.................................................................................. 17 13. PACKING MATERIALS ...................................................................... 19 14. NETWORK BOARD............................................................................ 19 15. ADJUSTING TOOL............................................................................. 21