Brother 1240, 1250, HL-1030 - page 55

CHAPTER 3 THEORY OF OPERATION

3-13

Two 16M-bit DRAMs (x 16 bits) are used as the RAM.

Fig. 3-14

HL-1250/1270N

Contents

Main Page PREFACE TABLE OF CONTENTS CHAPTER 2 INSTALLATION AND BASIC OPERATION.......................2-1 1. CONDITIONS REQUIRED FOR INSTALLATION................................ ....................2-1 6. NETWORK BOARD OPERATION (FOR HL-1270N ONLY) ..................................2-17 CHAPTER 3 THEORY OF OPERATION................................................. 3-1 CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY.............................. 4-1 CHAPTER 5 PERIODIC MAINTENANCE ...............................................5-1 CHAPTER 6 TROUBLESHOOTING........................................................6-1 APPENDICES INDEX REGULATION Page SAFETY INFORMATION CAUTION ATENCIN VORSICHT ATTENTION Page CHAPTER 1 GENERAL 1. FEATURES Page Page CHAPTER 1 GENERAL 1-4 2. OVERVIEW HL-1250/1270N <Front View> <Rear View> 3. SPECIFICATIONS 3.1 Printing 1-6 3.2 Functions 3.3 Electrical and Mechanical 3.4 Network (for HL-1270N only) 3.5 Paper Page Page 3.6 Printing Area Page CHAPTER 2 INSTALLATION AND BASIC OPERATION 1. CONDITIONS REQUIRED FOR INSTALLATION 1.3 System Requirements for Brother Printer Solution for Windows 1.1 Power Supply 1.2 Environment 2. UNPACKING 3. INSTALL THE PRINTER 3.1 For Windows Users Page 3.2 For Windows Users with No CD-ROM Drive Page 3.3 Using the USB Interface (for Windows Page 3.4 For Macintosh (iMac and Power Macintosh) with USB Users Only 4. PAPER HANDLING 4.1 Load Paper into the Paper Cassette 4.2 Load Paper Manually 4.3 Two Side Printing (Manual Duplexing) Page 5. CONTROL PANEL OPERATION 5.2 Data (Toner) LED Indications 5.3 Drum LED Indications 5.4 Alarm LED Indications 5.5 Control Panel Button Operations 5.6 Other Control Features Page 6. NETWORK BOARD OPERATION (FOR HL-1270N ONLY) 6.1 Preparing the BR-net Board 6.2 Functions L-LED 3-1 CHAPTER 3 THEORY OF OPERATION Fig. 3-1 supply block High-voltage power Low-voltage power 3-2 HL-1250 Fig. 3-2 shows a general block diagram of the HL-1250 printer. Fig. 3-2 supply block 3-3 HL-1270N Fig. 3-3 shows a general block diagram of the HL-1270N printer. Fig. 3-3 supply block 1.2 Main PCB Block Diagram Fig. 3-4 Fig. 3-4 shows the block diagram of the main PCB of the HL-1030/1240 printer. 3-5 HL-1250 Fig. 3-5 shows the block diagram of the main PCB of the HL-1250 printer. Fig. 3-5 3-6 HL-1270N Fig. 3-6 shows the block diagram of the main PCB of the HL-1270N printer. Fig. 3-6 1.3 Main PCB Page Page Page Page Page Page Page Page Page Page 1.4 Engine PCB 1.5 BR-net PCB (for HL-1270N only) 1.6 Power Supply 3-20 3-21 2. MECHANICS 2.1 Overview of Printing Mechanism 3-22 2.2 Paper Transfer 2.3 Sensors 2.4 Drum Unit 2.5 Toner Cartridge 2.6 Print Process - ---------- Page Page CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY 1. SAFETY PRECAUTIONS PCBs A 2. DISASSEMBL DISASSEMBLY FLOW B 4-2 3. DISASSEMBLY PROCEDURE 3.3 Paper Cassette Page Page Page Page Page 3.4 Network Board (for HL-1270N only) 3.5 Front Cover 3.6 Top Cover 3.7 Main Cover Page 3.8 Laser Unit 4-16 3.9 Drive Unit Page 3.10 Fixing Unit Page Page Page Page Page Page Page 4-26 Page Page 3.11 Base Plate Page 3.12 Main PCB ASSY 3.13 Lower Tray Relay PCB ASSY (for HL-1250/1270N only) 3.14 Low-Voltage Power Supply PCB ASSY Page 3.15 Engine PCB ASSY / High-Voltage Power Supply PCB ASSY 3.16 Panel PCB ASSY 3.17 Solenoid ASSY Page Page 3.18 Fan Motor ASSY 3.19 Toner Sensor PCB ASSY (Light Emission) 3.20 Toner Sensor PCB ASSY (Light Reception) 3.21 Paper Pick-up Roller ASSY 3.22 Paper Feed Roller ASSY 3.23 Outer Chute 1 4-40 4. PACKING CHAPTER 5 PERIODIC MAINTENANCE 1. CONSUMABLE PARTS 1.1 Drum Unit 1.2 Toner Cartridge 2. PERIODICAL REPLACEMENT PARTS 3. PERIODICAL CLEANING 3.1 Cleaning the Printer Exterior 3.2 Cleaning the Drum Unit 3.3 Cleaning the Scanner Window 3.4 Clean the Electrical Terminals Page Page CHAPTER 6 TROUBLESHOOTING 1. INTRODUCTION 1.1 Initial Check 1.2 Warnings for Maintenance Work CHAPTER 6 TROUBLESHOOTING 6-3 1.3 Identify the Problem The printer does not print. Printed page has a problem. 2. OPERATOR CALLS & SERVICE CALLS 2.1 Operator Calls 2.2 Service Calls Drum Ready Alarm Paper Toner Data 3. ERROR MESSAGES 3.1 Error Messages in the Status Monitor Page 3.2 Error Message Printouts 4. PAPER PROBLEMS 4.1 Paper Loading Problems 4.2 Paper Jams Page 4.3 Paper Feeding Problems F-1 Double feeding F-2 Wrinkles or creases F-3 Page skew F-4 Curl or Wave 5. SOFTWARE SETTING PROBLEMS S-1 S-2 S-3 Unable to print from application software under DOS. S-4 Unable to print from application software with an Apple Macintosh Computer. S-5 Although the USB driver is installed, it is unable to find the BRUSB: port. (HL-1240/1250/1270N only) S-6 This printer does not appear in Chooser with iMac and Power Macintosh G3 with USB. *NOTE: The value or alphabet following BR is a product ID. 6. MALFUNCTIONS M-1 No AC power supplied M-2 No DC power supplied M-3 Main motor does not rotate M-4 No paper supplied M-5 Insufficient output from high-voltage power supply unit M-6 Fixing heater temperature failure M-7 BD failure M-8 Scanner failure M-9 Fuser failure M-10 ROM error / D-RAM error / NV-RAM error M-11 Service A (Address error) / Service B (BUS error) / CPU runtime error M-12 Engine interface error M-13 PCI BUS error (HL-1270N only) CHAPTER 6 TROUBLESHOOTING 7. IMAGE DEFECTS Fig. 6-5 7.1 Image Defect Examples 7.2 Troubleshooting Image Defect I-1 Light , , , I-2 Dark I-3 Completely blank I-4 All black I-5 Dirt on the back of paper I-6 Black and blurred vertical streaks I-7 Black and blurred horizontal stripes I-8 Black vertical streaks (in a gray background) I-9 White vertical streaks I-10 White horizontal stripes I-11 Faulty registration I-12 Poor fixing I-13 Image distortion I-14 Faint print I-15 White spots Page I-16 Black spots I-17 Black band I-18 Gray background I-19 Hollow print I-20 Downward fogging of solid black I-21 Horizontal lines I-22 Light rain I-23 Ghost Page 7.3 Location of Grounding Contacts 8. INCORRECT PRINTOUT P-1 The printer prints unexpectedly or it prints garbage. P-2 Unable to print full pages of a document with the PRINT OVERRUN message. P-3 Unable to print full pages of a document with the MEMORY FULL message. P-4 P-5 9. NETWORK PROBLEM (FOR HL-1270N ONLY) 9.1 Installation Problem ipaddress UNIX, TCP/IP 9.2 Intermittent Problem 9.3 TCP/IP Troubleshooting 9.4 UNIX Troubleshooting 9.5 Windows NT/LAN Server (TCP/IP) Troubleshooting 9.6 Windows 95/98 Peer to Peer Print (LPR) Troubleshooting 9.7 Windows 95/98 (or later) Peer to Peer (HP JetAdmin Compatible Method) Troubleshooting 9.8 Windows 95/98/NT 4.0 Peer to Peer Print (NetBIOS) Troubleshooting 9.9 Internet Print (TCP/IP) Troubleshooting 9.10 Novell Netware Troubleshooting 9.11 AppleTalk Troubleshooting 9.12 Apple TCP/IP Printing (System 8.6 or later) 9.13 Web Browser Troubleshooting (TCP/IP) 10. INSPECTION MODE 10.1 Test Print Mode 10.2 Inspection Mode Page Page Page APPENDIX 1. SERIAL NO. DESCRIPTIONS X X X X X X G 9 J 1 1 1 1 0 1 9 F 3 0 J F 9 9 1 0 0 1 0 4 A-2 (4) Toner cartridge......imprinted on the aluminum bag 9 F 3 0 J .........printed on the bar code label attached on the toner cartridge 2 1 0 0 1 E 9 0 0 1 0 2 F 9 9 6 0 0 1 9 9 (5) Laser unit .............on the laser unit APPENDIX 2. DIAMETER / CIRCUMFERENCE OF ROLLERS APPENDIX 3. PRINT SPEEDS WITH VARIOUS SETTINGS APPENDIX 4. HOW TO KNOW DRUM UNIT LIFE & PAGE COUNTER 1. Print Configuration (for HL-1240/1250/1270N only) 2. Test Print (for HL-1030 only) 3. How to Read the Drum Unit Life 4. How to Read the Page Counter 5. How to Read the Maintenance Information Page APPENDIX 5. HOW TO USE THE SELF-DIAGNOSTICS TOOLS 1. Troubleshooting for Printer wont print 2. Diagnostics Page 3. Printer Information APPENDIX 6. NVRAM DEFAULT VALUE APPENDIX 7. PAPER CASSETTE INFORMATION (FOR EUROPE ONLY) Appendix 8. Connection Diagram, HL-1030/1240 INLET A - 17 AC INPUT Appendix 9. Connection Diagram, HL-1250 INLET PANEL PCB P14 A - 18 Appendix 10. Connection Diagram, HL-1270N INLET PANEL PCB P14 A - 19 Page Page Page Page Page Page Page Page Page Page Low-voltage PS Circuit (110 - 120V) A - 30 Appendix 20. Low-voltage Power Supply PCB Circuit Diagram (110 - 120V) + Low-voltage PS Circuit (220 - 240V) A - 31 Appendix 21. Low-voltage Power Supply PCB Circuit Diagram (220 - 240V) + High-voltage PS Circuit A - 32 Appendix 22A. High-voltage Power Supply PCB Circuit Diagram (OLD) High-voltage PS Circuit A - 33 Appendix 22B. High-voltage Power Supply PCB Circuit Diagram (NEW) APPENDIX 23. DIFFERENCES BETWEEN OLD & NEW VERSIONS OF HVPS & ENGINE PCB INDEX 1 3 4 A F G H I L M N O P Q R S T U W Page Page NOTE FOR USING THIS PARTS REFERENCE LIST B48K056 - 201A Rev. A CONTENTS