Brother 1240, HL-1030, 1250 service manual Pcb

Page 64

CHAPTER 3 THEORY OF OPERATION

Network

Board

(HL-1270N)

		Laser Unit

		Laser				Cover Sensor (B)
						Cover Sensor (B)

		Polygon Motor
		Polygon Motor

Main PCB

Low-Voltage

Power Supply

PCB

Engine

PCB

Front Registration Sensor

Rear Registration Sensor

Upper Paper Cassette Sensor (HL-1250/1270N)

Lower Paper Cassette Registration Sensor (HL-1250/1270N)

High-

Voltage

Power

Supply

PCB

Drum Unit

Primary Charger (Corona Wire)

Primary Charger (Grid)

Development Roller

Supply Roller

Transfer Roller

Fixing Unit

Halogen

Heater

Lamp

Solenoid

Fan Motor

Main Motor

Toner Sensor PCB (light emission) Cover Sensor (A) Toner Sensor PCB (light reception)

Thermistor (for Heat Roller)

Panel PCB

Fig. 3-28

3-22

Image 64

Contents Model HL-1030/1240/1250/1270N SM-PRN001Page Preface Table of Contents Theory of Operation Disassembly and RE-ASSEMBLY Periodic Maintenance TroubleshootingIndex Manufacturedk ManufacturedcIEC 825 220-240V Model only For Finland and SwedenSafety Information AchtungDefinitions of WARNINGS, Cautions and Notes Features High Resolution and Fast Print SpeedQuick Print Setup Versatile Paper HandlingEnhanced Memory Management Environment-FriendlyBar Code Print for HL-1250/1270N only Network Feature for HL-1270N onlyIsbn UPC-A UPC-E EAN-8 Overview Front ViewRear View HL-1030/1240 HL-1250/1270NPrinting SpecificationsDIB Functions CPUElectrical and Mechanical Paper Network for HL-1270N onlyFeedable paper General Paper cassette capacity Print deliveryPrinting Area Print guaranteed areaEffective printing area COM10 MonarchPower Supply Conditions Required for InstallationEnvironment Unpacking Install the Printer For Windows UsersInstallation and Basic Operation Install the drum unit For Windows Users with No CD-ROM DriveLoad paper Print a testInstall the printer driver from floppy disk Connect the printer and the computerInstall the USB driver Using the USB Interface for Windows 98 onlyConnect the USB interface cable Installation and Basic Operation For Macintosh iMac and Power Macintosh with USB Users Only Set the PC printer portLoad Paper into the Paper Cassette Paper HandlingLoad Paper Manually Two Side Printing Manual Duplexing To print on both sides of the paper from the paper cassetteInstallation and Basic Operation Alarm Control Panel OperationDrum Ready DataData Toner LED Indications Alarm LED IndicationsDrum LED Indications Other Control Features Sleep modeControl Panel Button Operations Operation DescriptionTest print mode Preparing the BR-net Board Network Board Operation for HL-1270N onlyConnect the Ethernet cable Print configuration Factory default settingLED functions LED green Link activityGeneral Block Diagram ElectronicsHL-1250 RAM 4MBShows a general block diagram of the HL-1270N printer HL-1270NMain PCB Block Diagram USB I/O CPU Core Reset Circuit Main PCB Asic HL-1030/1240HL-1250/1270N Theory of Operation 2 ROM HL-1030/1240 Two 32 Mbits ROMs x 16 bit are fitted Flash ROM for HL-1270N only Dram HL-1030/1240Two 16M-bit DRAMs x 16 bits are used as the RAM Optional RAM HL-1250/1270N Optional serial I/O HL-1250 PCI bus HL-1270NReset circuit HL-1030/1240 Eeprom HL-1030/1240Engine I/O HL-1030/1240 Engine PCB BR-net PCB for HL-1270N onlyLow-voltage power supply High-voltage power supply GNDMechanics Overview of Printing MechanismPCB Paper supply Paper TransferPaper registration Paper eject SensorsCover sensors a and B Drum Unit Toner CartridgeCharging Print ProcessExposure stage Developing Transfer Fixing stageTAPTITE, CUP S Safety PrecautionsScrew Disassembly Flow PCBsDisassembly Procedure AC CordPaper 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 Main PCB Assy Lower Tray Relay PCB Assy for HL-1250/1270N onlyLow-Voltage Power Supply PCB Assy 30A Engine PCB Assy / High-Voltage Power Supply PCB Assy PCB AssyToner sensor light Panel PCB Assy Solenoid AssyClutch lever spring For paper feed roller Step Cassette guide L/F Taptite, cup M3x6 Fan Motor Assy Toner Sensor PCB Assy Light Emission Toner Sensor PCB Assy Light ReceptionPaper Pick-up Roller Assy Paper Feed Roller Assy Outer Chute 70aPacking Replacement Procedure Consumable PartsToner Cartridge Periodic Maintenance Periodical Replacement Parts AssyCleaning the Printer Exterior Periodical CleaningCleaning the Drum Unit Cleaning the Scanner Window Clean the Electrical TerminalsMtbf / Mttr Periodic Maintenance Introduction Initial CheckTroubleshooting Identify the Problem Printer does not print Printed page has a problemOperator Calls & Service Calls Service CallsLED Indication Error Remedy Operator CallsSee ‘M-11 Service B’ How the LEDs indicate an errorError Messages in the Status Monitor Error MessagesError Message Remedy RAM Error NV-RAM ErrorMain Motor Error ErrorError Message Printouts Paper Loading Problems Paper ProblemsProblem Remedy Paper Jams Clearing jammed paperProblem Type of Jam Cause Remedy Causes & countermeasuresPaper Feeding Problems Double feedingWrinkles or creases User CheckSkew Curl or WaveSoftware Setting Problems Subsection 10.1 ‘Test PrintUnable to print from application software under DOS HL-1240/1250/1270N only Value or alphabet following ‘BR’ is a product ID No AC power supplied No DC power suppliedMalfunctions PCBMain motor does not rotate No paper suppliedFixing 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 Defects Image Defect ExamplesTroubleshooting Image Defect LightDark Completely blank All black How to clean the pressure roller Dirt on the back of paperBlack and blurred vertical streaks Black and blurred horizontal stripes Black vertical streaks in a gray backgroundWhite vertical streaks White horizontal stripesFaulty registration Poor fixingImage distortion Faint printWhite spots Photosensitive drum Black spots Black bandGray background Hollow printDownward fogging of solid black Horizontal linesLight rain GhostToner specks Drum unit Location of Grounding ContactsPrinter body & Paper cassette Incorrect Printout Printer prints unexpectedly or it prints garbageFor HL-1250/1270N only User Check For connecting by RS-232C/422A on HL-1250 only User Check For DOS environment onlyNetwork Problem for HL-1270N only Installation ProblemIntermittent Problem TCP/IP Troubleshooting Unix TroubleshootingWindows NT/LAN Server TCP/IP Troubleshooting Windows 95/98 Peer to Peer Print LPR TroubleshootingInternet Print TCP/IP Troubleshooting Novell Netware Troubleshooting AppleTalk TroubleshootingWeb Browser Troubleshooting TCP/IP Apple TCP/IP Printing System 8.6 or laterInspection Mode Test Print ModeType of mode Function For the demo printerInspection Mode Type of inspectionFactory inspection mode AlarmDrum ReadyTroubleshooting Troubleshooting Appendix 1. Serial NO. Descriptions Biuk0 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 Appendix 4. HOW to Know Drum Unit Life & page Counter Print Configuration for HL-1240/1250/1270N onlyTest Print for HL-1030 only Fig. A-2How to Read the Drum Unit Life How to calculate drum unit lifeHow to Read the Page Counter How to Read the Maintenance Information Fig. A-4Fig. A-7 Appendix 5. HOW to USE the SELF-DIAGNOSTICS Tools Troubleshooting for Printer won’t printDiagnostics Fig. A-10If you click the OK button in , the dialog box below appears Printer Information Fig. A-13Appendix 6. Nvram Default Value Items DescriptionsAppendix 7. Paper Cassette Information for Europe only Fig. aAppendix 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 High-voltage power supply PCB / Engine PCB Electrode helical spring / ChuteIndex Electrical terminal 22,4-30 2-10, 4-4, A-16 1-4 Index Parts Reference List PL-PRN001REF.NO Code ’TY Description Symbol Remark B48K056 201AContents REF.NO Code QTY Description Symbol Remark Main Motor AssyTAPTITE, CUP S M3X6 Solenoid AssyFrame / Drive Unit Bearing JointConductor Bearing Paper Feeder Cleaner Roller Assy Cleaner SpringREF.NO Code QTY Description Remark Fixing UNIT, 115V SPFixing Unit Paper Indicator Paper Tray ASSY, LGL SPPressure Plate ASSY, LGL Pressure Plate SpringPressure Roller Holder Paper Tray Assy 3 SPPaper Tray ASSY, LEG SP Paper Cassette Rear Cover TOP Cover10 UL9142001 1 Second Eject Roller Assy Model PlateCovers Main PCB ASSY, HL-1030 SP Main PCB ASSY, HL-1240 SPMain PCB ASSY, HL-1240 HEB SP Main PCB ASSY, HL-1240 PB SPHL-1030 HL-1240 HL-1250 HL-1270/1270N Engine PCB Assy A, 1240 SP Engine PCB Assy A, 1250 SPLOW-VOLTAGE PS ASSY, 115V SP LJ8330001 1 Protection TubeEngine PCB AC CORD, UL/CSA AC Cord ASSY, SAAAC Cord ASSY, SEV AC CORD, ChliHigh Voltage Power Supply PCB Setup GUIDE, FRA Setup GUIDE, GERSetup GUIDE, NL Setup GUIDE, NORAccessories Accessory Carton CARTON, HL-1030 EUCARTON, HL-1030 can CARTON, HL-1240 USPacking Materials Torx Screw Driver Tool no Tool Name RemarkMolykote PG-662 ADD

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