Two 16M-bit DRAMs x 16 bits are used as the RAM | Brother 1240

CHAPTER 3 THEORY OF OPERATION

HL-1250/1270N

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

Fig. 3-14

3-13

Image 55

Brother 1240, HL-1030, 1250 service manual Two 16M-bit DRAMs x 16 bits are used as the RAM

Contents

SM-PRN001 Model HL-1030/1240/1250/1270NPage Preface Table of Contents Theory of Operation Disassembly and RE-ASSEMBLY Troubleshooting Periodic Maintenance Index Manufacturedc Manufacturedk For Finland and Sweden IEC 825 220-240V Model only Achtung Safety Information Definitions of WARNINGS, Cautions and Notes Versatile Paper Handling FeaturesHigh Resolution and Fast Print Speed Quick Print Setup Environment-Friendly Enhanced Memory Management Bar Code Print for HL-1250/1270N only Network Feature for HL-1270N onlyIsbn UPC-A UPC-E EAN-8 HL-1250/1270N OverviewFront View Rear View HL-1030/1240 Printing SpecificationsDIB CPU Functions Electrical and Mechanical Paper Network for HL-1270N onlyFeedable paper General Print delivery Paper cassette capacity Printing Area Print guaranteed areaEffective printing area Monarch COM10 Power Supply Conditions Required for InstallationEnvironment Unpacking For Windows Users Install the Printer Installation and Basic Operation Print a test Install the drum unitFor Windows Users with No CD-ROM Drive Load paper Connect the printer and the computer Install the printer driver from floppy disk Install the USB driver Using the USB Interface for Windows 98 onlyConnect the USB interface cable Installation and Basic Operation Set the PC printer port For Macintosh iMac and Power Macintosh with USB Users Only Load Paper into the Paper Cassette Paper HandlingLoad Paper Manually To print on both sides of the paper from the paper cassette Two Side Printing Manual Duplexing Installation and Basic Operation Data AlarmControl Panel Operation Drum Ready Data Toner LED Indications Alarm LED IndicationsDrum LED Indications Operation Description Other Control FeaturesSleep mode Control Panel Button Operations Test print mode Preparing the BR-net Board Network Board Operation for HL-1270N onlyConnect the Ethernet cable LED green Link activity Print configurationFactory default setting LED functions Electronics General Block Diagram RAM 4MB HL-1250 HL-1270N Shows a general block diagram of the HL-1270N printer Main PCB Block Diagram USB I/O CPU Core Reset Circuit Asic HL-1030/1240 Main PCB HL-1250/1270N Theory of Operation 2 ROM HL-1030/1240 Two 32 Mbits ROMs x 16 bit are fitted Dram HL-1030/1240 Flash ROM for HL-1270N only Two 16M-bit DRAMs x 16 bits are used as the RAM Optional RAM HL-1250/1270N PCI bus HL-1270N Optional serial I/O HL-1250 Eeprom HL-1030/1240 Reset circuit HL-1030/1240 Engine I/O HL-1030/1240 BR-net PCB for HL-1270N only Engine PCB Low-voltage power supply GND High-voltage power supply Overview of Printing Mechanism Mechanics PCB Paper supply Paper TransferPaper registration Paper eject SensorsCover sensors a and B Toner Cartridge Drum Unit Charging Print ProcessExposure stage Developing Fixing stage Transfer TAPTITE, CUP S Safety PrecautionsScrew PCBs Disassembly Flow AC Cord Disassembly Procedure Paper Cassette Taptite, Torx pan M3x8 Disassembly and RE-ASSEMBLY Side guide L Side guide R Paper cassette Paper cassette Release lever extension spring Lock lever ➀ ➁ Network Board for HL-1270N only Front Cover Top Cover Main Cover Tray extension flap Main cover Laser Unit Drive Unit Main motor Assy Grease Molykote PG-662 1 rice-grain size Fixing Unit Fixing unit Main frame Concavity Remove the fixing unit cover from the fixing unit frame Halogen lamp Taptite, pan M3x10 Heat roller bearing Washer Heat roller gear Heat roller gear Heat roller bearing Embossment Heat roller cleaner Fixing unit frame Cleaner spring Hooks Thermistor Fixing unit frame Taptite, cup M3x12 Fixing unit frame First eject roller Idle gear PR2000057 26B Base Plate Ground wire Plastic chute Slit Main frame Lower Tray Relay PCB Assy for HL-1250/1270N only Main PCB Assy Low-Voltage Power Supply PCB Assy 30A PCB Assy Engine PCB Assy / High-Voltage Power Supply PCB Assy Toner sensor light Solenoid Assy Panel PCB Assy Clutch lever spring For paper feed roller Step Cassette guide L/F Taptite, cup M3x6 Fan Motor Assy Toner Sensor PCB Assy Light Reception Toner Sensor PCB Assy Light Emission Paper Pick-up Roller Assy Paper Feed Roller Assy 70a Outer Chute Packing Consumable Parts Replacement Procedure Toner Cartridge Periodic Maintenance Assy Periodical Replacement Parts Cleaning the Printer Exterior Periodical CleaningCleaning the Drum Unit Clean the Electrical Terminals Cleaning the Scanner Window Mtbf / Mttr Periodic Maintenance Initial Check Introduction Troubleshooting Printer does not print Printed page has a problem Identify the Problem Operator Calls Operator Calls & Service CallsService Calls LED Indication Error Remedy How the LEDs indicate an error See ‘M-11 Service B’ Error Messages in the Status Monitor Error MessagesError Message Remedy Error RAM ErrorNV-RAM Error Main Motor Error Error Message Printouts Paper Loading Problems Paper ProblemsProblem Remedy Clearing jammed paper Paper Jams Causes & countermeasures Problem Type of Jam Cause Remedy User Check Paper Feeding ProblemsDouble feeding Wrinkles or creases Curl or Wave Skew Subsection 10.1 ‘Test Print Software Setting Problems Unable to print from application software under DOS HL-1240/1250/1270N only Value or alphabet following ‘BR’ is a product ID PCB No AC power suppliedNo DC power supplied Malfunctions No paper supplied Main motor does not rotate Fixing heater temperature failure Insufficient output from high-voltage power supply unitBD failure Fuser failure Scanner failurePCB 24V DC? Engine interface error ROM error / D-RAM error / NV-RAM errorPCI BUS error HL-1270N only Image Defect Examples Image Defects Light Troubleshooting Image Defect Dark Completely blank All black Dirt on the back of paper How to clean the pressure roller Black and blurred vertical streaks Black vertical streaks in a gray background Black and blurred horizontal stripes White horizontal stripes White vertical streaks Poor fixing Faulty registration Faint print Image distortion White spots Photosensitive drum Black band Black spots Hollow print Gray background Horizontal lines Downward fogging of solid black Ghost Light rain Toner specks Drum unit Location of Grounding ContactsPrinter body & Paper cassette Printer prints unexpectedly or it prints garbage Incorrect Printout For HL-1250/1270N only User Check For DOS environment only User Check For connecting by RS-232C/422A on HL-1250 only Installation Problem Network Problem for HL-1270N only Intermittent Problem Unix Troubleshooting TCP/IP Troubleshooting Windows 95/98 Peer to Peer Print LPR Troubleshooting Windows NT/LAN Server TCP/IP Troubleshooting Internet Print TCP/IP Troubleshooting AppleTalk Troubleshooting Novell Netware Troubleshooting Apple TCP/IP Printing System 8.6 or later Web Browser Troubleshooting TCP/IP For the demo printer Inspection ModeTest Print Mode Type of mode Function Type of inspection Inspection Mode Ready Factory inspection modeAlarm Drum Troubleshooting Troubleshooting Biuk Appendix 1. Serial NO. Descriptions 0 0 1 0 Appendix 2. Diameter / Circumference of Rollers Media type setting All models Appendix 3. Print Speeds with Various SettingsMedia type setting HL-1240 demo model Print Configuration for HL-1240/1250/1270N only Appendix 4. HOW to Know Drum Unit Life & page Counter Fig. A-2 Test Print for HL-1030 only How to calculate drum unit life How to Read the Drum Unit Life How to Read the Page Counter Fig. A-4 How to Read the Maintenance Information Fig. A-7 Troubleshooting for Printer won’t print Appendix 5. HOW to USE the SELF-DIAGNOSTICS Tools Fig. A-10 Diagnostics If you click the OK button in , the dialog box below appears Fig. A-13 Printer Information Items Descriptions Appendix 6. Nvram Default Value Fig. a Appendix 7. Paper Cassette Information for Europe only Appendix 8. Connection Diagram, HL-1030/1240 Appendix 9. Connection Diagram, HL-1250 Appendix 10. Connection Diagram, HL-1270N Appendix 11. Main PCB Circuit Diagram, HL-1030/1240 1/2 Appendix 12. Main PCB Circuit Diagram, HL-1030/1240 2/2 Appendix 13. Main PCB Circuit Diagram, HL-1250/1270N 1/5 Appendix 14. Main PCB Circuit Diagram, HL-1250/1270N 2/5 Appendix 15. Main PCB Circuit Diagram, HL-1250/1270N 3/5 Appendix 16. Main PCB Circuit Diagram, HL-1250/1270N 4/5 Appendix 17. Main PCB Circuit Diagram, HL-1250/1270N 5/5 Appendix 18A. Engine PCB Circuit Diagram OLD Appendix 18B. Engine PCB Circuit Diagram NEW Appendix 19. Network Board Circuit Diagram, HL-1270N Low-voltage PS Circuit 110 Low-voltage PS Circuit 220 High-voltage PS Circuit CN1 CN2 DEV1 Electrode helical spring / Chute High-voltage power supply PCB / Engine PCB Index Electrical terminal 22,4-30 2-10, 4-4, A-16 1-4 Index PL-PRN001 Parts Reference List B48K056 201A REF.NO Code ’TY Description Symbol Remark Contents Solenoid Assy REF.NO Code QTY Description Symbol RemarkMain Motor Assy TAPTITE, CUP S M3X6 Frame / Drive Unit Bearing JointConductor Bearing Paper Feeder Fixing UNIT, 115V SP Cleaner Roller AssyCleaner Spring REF.NO Code QTY Description Remark Fixing Unit Pressure Plate Spring Paper IndicatorPaper Tray ASSY, LGL SP Pressure Plate ASSY, LGL Pressure Roller Holder Paper Tray Assy 3 SPPaper Tray ASSY, LEG SP Paper Cassette Model Plate Rear CoverTOP Cover 10 UL9142001 1 Second Eject Roller Assy Covers Main PCB ASSY, HL-1240 PB SP Main PCB ASSY, HL-1030 SPMain PCB ASSY, HL-1240 SP Main PCB ASSY, HL-1240 HEB SP HL-1030 HL-1240 HL-1250 HL-1270/1270N LJ8330001 1 Protection Tube Engine PCB Assy A, 1240 SPEngine PCB Assy A, 1250 SP LOW-VOLTAGE PS ASSY, 115V SP Engine PCB AC CORD, Chli AC CORD, UL/CSAAC Cord ASSY, SAA AC Cord ASSY, SEV High Voltage Power Supply PCB Setup GUIDE, NOR Setup GUIDE, FRASetup GUIDE, GER Setup GUIDE, NL Accessories CARTON, HL-1240 US Accessory CartonCARTON, HL-1030 EU CARTON, HL-1030 can Packing Materials Torx Screw Driver Tool no Tool Name RemarkMolykote PG-662 ADD