High-Voltage Transformer Output Control Circuit | Toshiba 4511

12.7 High-Voltage Transformer Output Control Circuit

Developer bias is supplied from high-voltage power supply to the developer sleeve and the toner image on the developer sleeve is transferred onto the photoconductive drum.

A color developer bias and a black developer bias are output separately.

Each developer bias consists of DC and AC which has an independent ON/OFF control. At DC, D/A converter adjusts the level of output value in both color and black modes since each mode has a different control condition.

Color developer sleeve

CPU	D/A	KDVVR
	D/A
	converter
	converter
		CDVVR
Gate array		HVT-PWA	Photoconductive
	KDVDON-0	HVT-PWA	drum
			drum

LCA301-2	KVDAON-0	Buffer
		Buffer

	CDVDON-0
	CDVAON-0		Black developer
	CDVAON-0		sleeve
			sleeve

Fig. 12-701

•Outputs adjustment value of the developer bias (DC) in the NVRAM to the main processor.

↓

•Outputs control voltage data from the main CPU to the D/A converter.

↓

•Analog conversion by the D/A converter.

↓

•Outputs control voltage Vc to the developer bias transformer.

↓

•The developer bias transformer generates output voltage proportional to the control voltage Vc by ON- signed.

*Adjustment of the control voltage Vc (change of adjustment data) is performed in the adjustment mode.

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November 2003 © TOSHIBA TEC

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e-STUDIO3511/4511 DEVELOPER UNIT

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Toshiba 4511, 3511 manual High-Voltage Transformer Output Control Circuit, CDVDON-0 CDVAON-0

Contents

STUDIO3511/4511 Toshiba TEC Corporation Service of Machines General Precautions Regarding the Installation Main Service Parts for Safety Contents Control circuit for the exposure lamp Control Panel 10-5 10.110-1 10.2 12.3 12.112-1 12.2 15.3 15.115-1 15.2 STUDIO3511/4511 Contents November 2003 Toshiba TEC Specifications SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES ADU PFP LCF System copy speed M2 17-22 lb. Bond Automatic duplexing unit Stackless/switchback typeTo 550 sheets 64-80 g/m2 17-22 lb. Bond Sheets 64-80 g/m2 17-22 lb. Bond 718 Accessories Supplies Options STAPLE-600 System ListSTAPLE-2000 Radf STUDIO3511/4511 Specifications November 2003 Toshiba TEC Front side view Outline of the MachineSectional View Toner recovery auger Recovery bladeDrum cleaning blade Drum cleaner brush Rear side view Drive system Transport motor Drum cleaner brush motorScan motor Main motor Front side Electric Parts LayoutUnit construction EXP Scanner unit Motor, sensor, lampA4 series LT series Control panel unit Switch, PC board, heater, thermostat, other partDH1 ASD/AUD/CND/SAD/TWD models Standard NAD/MJD models Option Process unit Motor, sensor, switch, clutch, solenoid Laser unit Motor, switchS25 S26 M13 Front side CLT5 Paper feeder unitTransport unit CLT3 ADU CLT7 Bypass unitAutomatic duplexing unit SFB CLT6 SOL3 Drive unit Fuser unit HDD NIC BRK PC board unitLGC SYS Symbols and Functions of Various Components Sensors and switches CST-L-TRY-SNR CCL-F-POS-SWCCL-R-POS-SW CST-U-TRY-SNR Solenoids Electromagnetic clutches PC boards Thermistors and thermostats Lamps and heaters Others Transformer 24GeneralDescription Function of each board CCD board Construction of boards Construction diagram of boardsPage HVT Receiving tray Disassembly and Replacement of Covers and PC boardsCovers Front cover / Toner bag Left cover Tray back coverFront lower cover Front right cover Right upper cover Left rear coverLeft upper cover Front upper cover Right rear cover IH terminal cover Rear cover Right lower coverRight rear hinge cover Right front hinge cover Upper rear cover Hard disk HDD PC boards Logic PC board LGC board A-1 LGC board caseLGC board System control PC board case SYS board case NIC board / System control PC board SYS board Remove 4 screws and take off the SYS board case Flow Power supply unitHigh-voltage transformer Fuse board FUS board Noise filter Options MR-3015 Reversing Automatic Document Feeder Radf Driving PC board DRV boardPage KD-1011 Paper Feed Pedestal PFP Heater is installed KD-1012 Large Capacity Feeder LCF Page Lift up the equipment and take off the LCF MJ-1022 Hanging finisher When PFP/LCF is not installed Remove 2 screws Lift up the finisher and take it off When PFP/LCF is installedPage MJ-1023 Console finisher MJ-1024 Console finisher Page MJ-6004 Hole punch unit Page KN-3511 Bridge unit Remove 2 screws Lift up the punch unit and take it off November 2003 Toshiba TEC Expression of Colors and 4-Step Copy Process Copy Process Photocon General Description of Copying Process Details 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 Warming-up General OperationOverview of Operation Description of Operation Drawer feed copying Upper drawer paper feeding Ready ready for copyingPage Page Scan motor fwd Interruption copying Bypass feed copying Description of abnormality A-1 Add paper Detection of AbnormalityTypes of abnormality STUDIO3511/4511 General Operation November 2003 Toshiba TEC Paper jam E010 → The copying operation is Stopped Registration clutch turned on ↓ Approx 1.2 secApprox 1.2 seconds Paper jam E020 → The copying operation is Exit sensor detects jamming of the trailing edge PaperRegistration clutch turned OFF After approx 1.3 seconds November 2003 Toshiba TEC STUDIO3511/4511 General Operation Power on to ready Flow Chart Ready Automatic feed copying Main charger on YES Control Panel and Display Panel Control Panel Items Shown on the Display Panel Display Copying Saddle StitchTray Full Ready Change Drawer To Correct Paper Size This Size Paper Check PaperLarge Capacity Feeder Cannot Punch Counter Department To Correct Media Type Press Basic Radf Structure Dot matrix LCD circuit Load Frame Data TransmissionFrame Method of LED display ex Displaying Copy LED display circuit Slide the stopper and pull it out Disassembly and ReplacementStopper November 2003 Toshiba TEC STUDIO3511/4511 Control Panel Remove 16 screws and take off the KEY board Function Scanner Construction Mirror-2 Mirror-3 Scan motor PS-ACC-350 Scanning drive circuit Input/output signals On no YES Initialization at power-ONOnno YES OFF YES CPU Control of Exposure LampGeneral description PWA-CCD CCD PWA-CCDPWA-SLG Exposure lamp Control circuit for the exposure lamp Shading correction General Description of CCD ControlOpto-electronic conversion Process of detection of original size Automatic Original Size Detection CircuitPrinciple of original size detection APS-1 APS-2 APS-3 ST-R APS-C APS-R APS-1 APS-2 APS-3APS-C APS-R APS-2 APS-3 Original LEDPhototransistor SLG board cooling fan Original glassLens cover LT series Automatic original detection sensor APS sensor A4 series Lens unit Carriages-1 Carriage-1 Carriage Refer to the Service Handbook for more details Scanning section control PC board SLG board Platen sensorCarriage home position sensor Followings are the boards used for image processing Image ProcessingGeneral Description CCD Asic ACS Configuration-201 shows the image processing section of this equipment Asic SYS Board PWA-F-SYS-350 Features Example Functions of image processing circuit ’ = + b + Example Reduction Example Enlargement Paper November 2003 Toshiba TEC STUDIO3511/4511 Image Processing Laser Driving PC Board LDR Board LGC Board PWA-F-LGC-350 Laser 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 Polygonal Motor Polygonal motor ON/OFF signalPolygonal motor reference clock signal Laser Unit Cooling Fan Laser optical unit Laser unit cooling fan Drive System Construction Main Motor Drive circuit of main motor Signal level of motor circuit Transport Motor Drive circuit of transport motor Developer Motor Normal Out of control Developer motor PLL signal Developer motor on signalDeveloper motor rotational direction signal Developer motor reference clock signal Developer motor drive unit Black developer lifting clutch Developer motorRemove 2 screws and take off the developer motor 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 General Descriptions Paper Feeding SystemPage 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 Bypass feeding General operation From power-ON to ready statusReady status Drawer feedingD-1 Lower drawer Stop Drive Circuit of Tray-up MotorIN1 IN2 Brake CCW Bypass unit A-1 Bypass unit Bypass tray slide guide width detection PC board Bypass pickup roller Bypass transport roller Bypass paper sensor Bypass pickup solenoid Bypass separation roller Bypass feed roller Bypass feed sensor Lower drawer feed sensor/Side cover opening/closing switchRemove the arbor, shaft and spring Upper drawer feed sensor/Registration sensor Registration roller Remove 1 screw and take off the separation roller holder Drawer feeding unit E-1 Drawer feeding unitFeed clutch Separation roller CLUTCH-6-L Pickup roller Drawer paper stock sensor Remove the pulley, one-way clutch and 3 E-ringsFeed roller 6Drawer tray-up sensor and Drawer empty sensor Tray drive unit Tray drive unit Registration guide Lower transport clutch Low/High speed Middle guide Drum Related Section Functions Page IC7 Output Control Circuits of High-Voltage Transformer CPU Drum Temperature Detection Circuit Temperature/Humidity Sensor Operation Charger Wire Cleaner Drive circuit Cleaner unit Cleaner unit Main charger grid Main charger unit B-1 Main charger unit Remove 1 screw and take off the pad guide Charger wireWire pad Drum Remove the base Drum cleaner brush Cleaner Drum cleaning bladeRecovery blade Remove the discharge LED Drum thermistorDischarge LED unit F-1 Discharge LED Charger cleaner detection switch Charger cleaner motor Toner bag full detection sensor-2 Ozone exhaust fan Temperature/Humidity sensorOzone filter Latch Page Developer Unit Color auto-toner sensor Mixer Developer sleeve Toner motor Black Toner Cartridge Drive UnitGeneral descriptions Functions Black Developer Unit Black developer unit drive section Converter Black auto-toner sensor circuitLCA301-1 Magnetic circuit STUDIO3511/4511 Developer Unit November 2003 Toshiba TEC Black developer unit lifting mechanism Color Developer Unit Gear G21 Color developer unit drive section Color auto-toner sensor circuit Page Color toner supply CDVDON-0 CDVAON-0 High-Voltage Transformer Output Control Circuit Developer material Black developer unit A-1 Black developer unit Doctor blade Pour the developer materialAuto-toner sensor Developer sleeve Remove 2 screws and take off the doctor blade Mixer Color developer unit B-1 Developer material Take off the mixer from the hole of front side Discharge the developer material Pour the developer material Gear assembly Procedure for replacing an oil seal Take off the black developer toner supply unit .7 K Black developer lifting unit Black toner supply unit Remove 2 screws and take off the cleaner rail stay Cartridge switch with the whole bracket Black toner supply auger unit Remove 2 screws and take off the toner motor STUDIO3511/4511 Developer Unit November 2003 Toshiba TEC Revolver Unit STUDIO3511/4511 Revolver Unit November 2003 Toshiba TEC Drive of Revolver Unit Revolver motor Revolver Motor Drive Circuit During warming-up OperationHome position detection Escape position movement During image quality control Color developer unit Color toner cartridge Rear Front Color toner cartridge sensor Remove 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 2nd transfer Outline of 1st transfer PWA High-Voltage Power SupplyLCA-301-1 1000V Transfer belt unit Loosen 3 screws and take off the bracket Transfer belt Stand plate short 1st transfer roller Transfer belt home position sensor-2 Transfer belt home position sensor-1 Transfer 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 unit 2nd transfer roller 2nd transfer roller contact clutch Paper clinging detection sensor 2nd transfer roller position detection sensor Paper clinging detection sensor Bracket Page Principle of the Sensor Image Quality Control YES Flow Chart of Control Procedure Various image forming conditions Image quality sensor / Image quality sensor Shutter solenoid Fuser Unit / Paper Exit Section Functions Page Heater Control Circuit Configuration Image of Current Flowing form a to B Book Diagram of High Frequency Power SupplyHeating principle of IH Heater IH1 on IH control circuit interface+5VSW IH2 on FAX For ASD, AUD, CNDOFF Control of the surface temperature of the fuser belt Temperature detection section Energy Saver Reference PC4/AN4 Condtion Priority of error checking Abnormality in the IH control circuit IH error Exit Motor Drive Control Circuit of Exit Motor Oil roller Rear side Cleaning roller Fuser roller / Fuser belt guide IH coil Bearing Fuser belt guide Fuser belt Separation finger Separation finger unit Thermostat Pressure roller Thermistor Remove 2 screws and take off the thermostat from the bracket Exit sensor / Exit finger / Transport guide Exit roller IH control board cooling fan IH control PC board IH board Scraper Flow Automatic Duplexing Unit ADU Description of Operations Page Page Page Unit msec Equipment ADU entrance sensor ADU exit sensor ADU clutch ADU motor Exit sensor Registration sensor Registration clutch Drive of ADU Yes Command signal Operation of DC Output Circuits Power Supply Unit Output Channel November 2003 Toshiba TEC STUDIO3511/4511 Power Supply Unit F54A Semi time-lag +24VD4 Charger cleaner motor Power supply Power supply cooling fanFuse Bridge unit +24VD2 Toshiba Configuration of Power Supply Unit PWR-EN Sequence of Power SupplyPWR-DN Scanner AC Wire Harness STUDIO3511/4511 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-ADU PWA-F-LDR PWA-F-SNS PWA-F-DSP PWA-F-KEY PWA-F-FUS ASD/AUD/CND models Standard, MJD model Option PWA-F-FILNAD/SAD/TWD models Standard STUDIO3511/4511 PC Boards November 2003 Toshiba TEC Page Kanda NISHIKI-CHO, CHIYODA-KU, TOKYO, 101-8442 Japan