Toshiba 3511, 4511 Control of Exposure Lamp, General description, Pwa-Ccd Ccd Pwa-Ccdpwa-Slg, Cpu

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6

6.4 Control of Exposure Lamp

6.4.1 General description

Control circuit for the exposure lamp consists of the following two blocks:

(1)Lighting device for the xenon lamp (Inverter) Turns ON/OFF the exposure lamp.

(2)CCD circuit

This circuit converts the reflected light amount from the original surface and the shading correction plate to electrical signals. The exposure amount is controlled in two ways:

(a)White reference formation - reads the reflected light amount from the white shading correction plate

(b)Black reference formation - reads the light amount at the regulation position with the exposure lamp lights OFF

Original

Shading correction plate

Exposure lamp (Xenon lamp)

Lighting device for xenon lamp (Inverter)

PWA-CCD CCD

PWA-CCDPWA-SLG

Scanner

A/D CPU

Fig. 6-401

e-STUDIO3511/4511 SCANNER

6 - 8

November 2003 © TOSHIBA TEC

Image 118

Contents STUDIO3511/4511 Toshiba TEC Corporation General Precautions Regarding the Installation Service of MachinesMain Service Parts for Safety Contents Control Panel Control circuit for the exposure lamp10.2 10.110-1 10-512.2 12.112-1 12.315.2 15.115-1 15.3STUDIO3511/4511 Contents November 2003 Toshiba TEC SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES SpecificationsSystem copy speed ADU PFP LCFSheets 64-80 g/m2 17-22 lb. Bond Automatic duplexing unit Stackless/switchback typeTo 550 sheets 64-80 g/m2 17-22 lb. Bond M2 17-22 lb. Bond718 Accessories Options SuppliesRadf System ListSTAPLE-2000 STAPLE-600STUDIO3511/4511 Specifications November 2003 Toshiba TEC Sectional View Outline of the MachineFront side view Drum cleaner brush Recovery bladeDrum cleaning blade Toner recovery augerRear side view Drive system Main motor Drum cleaner brush motorScan motor Transport motorUnit construction Electric Parts LayoutFront side LT series Scanner unit Motor, sensor, lampA4 series EXPASD/AUD/CND/SAD/TWD models Standard NAD/MJD models Option Switch, PC board, heater, thermostat, other partDH1 Control panel unitProcess unit Motor, sensor, switch, clutch, solenoid S25 S26 M13 Front side Motor, switchLaser unit CLT3 Paper feeder unitTransport unit CLT5SFB CLT6 SOL3 Bypass unitAutomatic duplexing unit ADU CLT7Fuser unit Drive unitLGC SYS PC board unitHDD NIC BRK Symbols and Functions of Various Components Sensors and switches CST-U-TRY-SNR CCL-F-POS-SWCCL-R-POS-SW CST-L-TRY-SNRElectromagnetic clutches SolenoidsPC boards Lamps and heaters Thermistors and thermostatsTransformer Others24GeneralDescription Construction of boards Construction diagram of boards Function of each board CCD boardPage HVT Covers Front cover / Toner bag Disassembly and Replacement of Covers and PC boardsReceiving tray Front right cover Tray back coverFront lower cover Left coverFront upper cover Left rear coverLeft upper cover Right upper coverIH terminal cover Right rear coverRight front hinge cover Right lower coverRight rear hinge cover Rear coverUpper rear cover LGC board PC boards Logic PC board LGC board A-1 LGC board caseHard disk HDD System control PC board case SYS board case Remove 4 screws and take off the SYS board case NIC board / System control PC board SYS boardHigh-voltage transformer Power supply unitFlow Noise filter Fuse board FUS boardDriving PC board DRV board Options MR-3015 Reversing Automatic Document Feeder RadfPage Heater is installed KD-1011 Paper Feed Pedestal PFPKD-1012 Large Capacity Feeder LCF Page MJ-1022 Hanging finisher When PFP/LCF is not installed Lift up the equipment and take off the LCFWhen PFP/LCF is installed Remove 2 screws Lift up the finisher and take it offPage MJ-1023 Console finisher MJ-1024 Console finisher Page MJ-6004 Hole punch unit Page Remove 2 screws Lift up the punch unit and take it off KN-3511 Bridge unitNovember 2003 Toshiba TEC Copy Process Expression of Colors and 4-Step Copy ProcessGeneral Description of Copying Process PhotoconDetails of Copying Process CCD board White background Image is not Developed Photoconductive Photoconductive Layer Aluminum Base Blade cleaning Recovery blade Drum rotation List of Copying Process Conditions Pressure roller Silicon sponge STUDIO3511/4511 Copy Process November 2003 Toshiba TEC Description of Operation General OperationOverview of Operation Warming-upReady ready for copying Drawer feed copying Upper drawer paper feedingPage Page Scan motor fwd Bypass feed copying Interruption copyingTypes of abnormality Detection of AbnormalityDescription of abnormality A-1 Add paper STUDIO3511/4511 General Operation November 2003 Toshiba TEC Approx 1.2 seconds Registration clutch turned on ↓ Approx 1.2 secPaper jam E010 → The copying operation is Stopped After approx 1.3 seconds Exit sensor detects jamming of the trailing edge PaperRegistration clutch turned OFF Paper jam E020 → The copying operation isNovember 2003 Toshiba TEC STUDIO3511/4511 General Operation Flow Chart Power on to readyReady Automatic feed copying Main charger on YES Control Panel Control Panel and Display PanelItems Shown on the Display Panel Display Change Drawer To Correct Paper Size Saddle StitchTray Full Ready CopyingLarge Capacity Feeder Cannot Punch Check PaperThis Size Paper Department CounterTo Correct Media Type Press Basic Radf Dot matrix LCD circuit StructureFrame Data TransmissionLoad Frame LED display circuit Method of LED display ex Displaying CopyStopper Disassembly and ReplacementSlide the stopper and pull it out November 2003 Toshiba TEC STUDIO3511/4511 Control Panel Remove 16 screws and take off the KEY board Scanner FunctionConstruction Mirror-2 Mirror-3 Scan motor Scanning drive circuit PS-ACC-350Input/output signals OFF YES Initialization at power-ONOnno YES On no YESPWA-CCD CCD PWA-CCDPWA-SLG Control of Exposure LampGeneral description CPUExposure lamp Control circuit for the exposure lamp Opto-electronic conversion General Description of CCD ControlShading correction Principle of original size detection Automatic Original Size Detection CircuitProcess of detection of original size APS-3 APS-1 APS-2APS-C APS-R APS-2 APS-3 APS-C APS-R APS-1 APS-2 APS-3ST-R Original LEDPhototransistor Lens cover Original glassSLG board cooling fan Automatic original detection sensor APS sensor A4 series LT seriesLens unit Carriages-1 Carriage-1 Carriage Refer to the Service Handbook for more details Carriage home position sensor Platen sensorScanning section control PC board SLG board General Description Image ProcessingFollowings are the boards used for image processing CCD Asic Configuration-201 shows the image processing section of this equipment Asic ACSFeatures SYS Board PWA-F-SYS-350Functions of image processing circuit Example’ = + b + Example Enlargement Example ReductionPaper November 2003 Toshiba TEC STUDIO3511/4511 Image Processing LGC Board PWA-F-LGC-350 Laser Driving PC Board LDR BoardLaser Optical Unit Writing Section Overview Structure STUDIO3511/4511 Laser Optical Unit November 2003 Toshiba TEC Deviation STUDIO3511/4511 Laser Optical Unit November 2003 Toshiba TEC Laser power comparison circuit Laser driver Circuit Constant Laser Unit Cooling Fan Polygonal motor ON/OFF signalPolygonal motor reference clock signal Polygonal MotorLaser optical unit Laser unit cooling fan Drive System Main Motor ConstructionSignal level of motor circuit Drive circuit of main motorTransport Motor Drive circuit of transport motor Developer Motor Developer motor reference clock signal Developer motor on signalDeveloper motor rotational direction signal Normal Out of control Developer motor PLL signalDeveloper motor drive unit Remove 2 screws and take off the developer motor Developer motorBlack developer lifting clutch Transport motor drive unit Setscrew Transport motor drive unit Connector Main motor drive unit Tension plate Motor STUDIO3511/4511 Drive System November 2003 Toshiba TEC Paper Feeding System General DescriptionsPage Paper Feeding Section Sectional View Front side Paper Feeding Section Drive System Rear side Operation of bypass pickup roller Operation of drawer pickup roller Separation of paper Ready status General operation From power-ON to ready statusBypass feeding Drawer feedingD-1 Lower drawer IN1 IN2 Brake CCW Drive Circuit of Tray-up MotorStop Bypass unit A-1 Bypass unit Bypass tray slide guide width detection PC board Bypass transport roller Bypass pickup rollerBypass pickup solenoid Bypass paper sensorBypass feed roller Bypass separation rollerRemove the arbor, shaft and spring Lower drawer feed sensor/Side cover opening/closing switchBypass feed sensor Upper drawer feed sensor/Registration sensor Registration roller Separation roller Drawer feeding unit E-1 Drawer feeding unitFeed clutch Remove 1 screw and take off the separation roller holderPickup roller CLUTCH-6-L6Drawer tray-up sensor and Drawer empty sensor Remove the pulley, one-way clutch and 3 E-ringsFeed roller Drawer paper stock sensorTray drive unit Tray drive unitLower transport clutch Low/High speed Registration guideMiddle guide Drum Related Section Functions Page Output Control Circuits of High-Voltage Transformer IC7Drum Temperature Detection Circuit CPUTemperature/Humidity Sensor Charger Wire Cleaner OperationDrive circuit Cleaner unit Cleaner unit Main charger unit B-1 Main charger unit Main charger gridWire pad Charger wireRemove 1 screw and take off the pad guide Remove the base DrumRecovery blade Cleaner Drum cleaning bladeDrum cleaner brush Discharge LED unit F-1 Discharge LED Drum thermistorRemove the discharge LED Charger cleaner motor Charger cleaner detection switchToner bag full detection sensor-2 Ozone filter Temperature/Humidity sensorOzone exhaust fan Latch Page Developer Unit Color auto-toner sensor Mixer Developer sleeve General descriptions Black Toner Cartridge Drive UnitToner motor Black Developer Unit FunctionsBlack developer unit drive section LCA301-1 Black auto-toner sensor circuitConverter Magnetic circuit STUDIO3511/4511 Developer Unit November 2003 Toshiba TEC Black developer unit lifting mechanism Color Developer Unit Color developer unit drive section Gear G21Color auto-toner sensor circuit Page Color toner supply High-Voltage Transformer Output Control Circuit CDVDON-0 CDVAON-0Black developer unit A-1 Black developer unit Developer materialAuto-toner sensor Pour the developer materialDoctor blade Remove 2 screws and take off the doctor blade Developer sleeveMixer Take off the mixer from the hole of front side Color developer unit B-1 Developer materialDischarge the developer material Pour the developer material Gear assembly Procedure for replacing an oil seal Black developer lifting unit Take off the black developer toner supply unit .7 KRemove 2 screws and take off the cleaner rail stay Black toner supply unitCartridge switch with the whole bracket Remove 2 screws and take off the toner motor Black toner supply auger unitSTUDIO3511/4511 Developer Unit November 2003 Toshiba TEC Revolver Unit STUDIO3511/4511 Revolver Unit November 2003 Toshiba TEC Drive of Revolver Unit Revolver Motor Drive Circuit Revolver motorEscape position movement OperationHome position detection During warming-upDuring image quality control Color toner cartridge Color developer unitColor toner cartridge sensor Rear FrontRemove 1 screw and take off the color toner cartridge sensor Revolver home position sensor Revolver unit Lock lever Remove 5 screws and take off the bracket Internal cooling fan Transfer Unit STUDIO3511/4511 Transfer Unit November 2003 Toshiba TEC Page Outline of 1st transfer Outline of 2nd transfer1000V High-Voltage Power SupplyLCA-301-1 PWATransfer belt unit Loosen 3 screws and take off the bracket Transfer belt Stand plate short 1st transfer roller Transfer belt home position sensor-1 Transfer belt home position sensor-2Transfer belt cleaning unit Remove 1 screw and take off the bracket on the front side Conductive tape Harness clamp Transfer belt cleaner auger motor 2nd transfer roller 2nd transfer unit2nd transfer roller contact clutch 2nd transfer roller position detection sensor Paper clinging detection sensorPaper clinging detection sensor Bracket Page Image Quality Control Principle of the SensorFlow Chart of Control Procedure YESVarious image forming conditions Image quality sensor / Image quality sensor Shutter solenoid Fuser Unit / Paper Exit Section Functions Page Configuration Heater Control CircuitHeating principle of IH Heater Book Diagram of High Frequency Power SupplyImage of Current Flowing form a to B IH2 on IH control circuit interface+5VSW IH1 onOFF For ASD, AUD, CNDFAX Temperature detection section Control of the surface temperature of the fuser beltEnergy Saver Reference PC4/AN4 Condtion Priority of error checking Abnormality in the IH control circuit IH error Control Circuit of Exit Motor Exit Motor DriveOil roller Cleaning roller Rear sideIH coil Fuser roller / Fuser belt guideBearing Fuser belt guide Fuser belt Separation finger Separation finger unit Pressure roller ThermostatRemove 2 screws and take off the thermostat from the bracket ThermistorExit sensor / Exit finger / Transport guide Exit roller IH control PC board IH board IH control board cooling fanFlow ScraperAutomatic Duplexing Unit ADU Description of Operations Page Page Page Equipment Unit msecExit sensor Registration sensor Registration clutch ADU entrance sensor ADU exit sensor ADU clutch ADU motorDrive of ADU Yes Command signal Power Supply Unit Operation of DC Output CircuitsOutput Channel November 2003 Toshiba TEC STUDIO3511/4511 Power Supply Unit Bridge unit +24VD2 Charger cleaner motor Power supply Power supply cooling fanFuse F54A Semi time-lag +24VD4Configuration of Power Supply Unit ToshibaPWR-DN Sequence of Power SupplyPWR-EN AC Wire Harness ScannerSTUDIO3511/4511 Power Supply Unit November 2003 Toshiba TEC PC Boards PWA-F-LGC PWA-F-SLG PWA-F-CCD PWA-F-SDV PWA-F-DRV PWA-F-LDR PWA-F-SNS PWA-F-ADUPWA-F-DSP PWA-F-KEY NAD/SAD/TWD models Standard PWA-F-FILPWA-F-FUS ASD/AUD/CND models Standard, MJD model Option STUDIO3511/4511 PC Boards November 2003 Toshiba TEC Page Kanda NISHIKI-CHO, CHIYODA-KU, TOKYO, 101-8442 Japan

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