Toshiba 4511, 3511 11.4 Drum Temperature Detection Circuit

November 2003 © TOSHIBA TEC 11 - 5 e-STUDIO3511/4511 DRUM RELATED SECTION

11.4 Drum Temperature Detection Circuit

(1) Purpose of the drum temperature detection circuit

Since the photoconductive characteristic of the drum surface varies drastically depending on the

surface temperature of the drum, this circuit detects the temperature of the drum surface to gain the

charging potential according to the environment.

(2) Configuration of the drum temperature detection circuit

Temperature/

humidity sensor

Fig. 11-401

CPU

AN7

V

TEMP

R

Contents

Main Page GENERAL PRECAUTIONS REGARDING THE INSTALLATION AND SERVICE FOR e-STUDIO3511/4511 Page CONTENTS 1. SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES.......................................... 1-1 Page Page Page Page Page 1. SPECIFICATIONS/ACCESSORIES/OPTIONS/SUPPLIES 1.1 Specifications * * * * System copy speed Page Page 1.2 Accessories 11.3 Options 1.4 Supplies 1.5 System List Page 2. OUTLINE OF THE MACHINE 2.1 Sectional View [A] Front side view Page [B] Rear side view (Drive system) Page 2.2 Electric Parts Layout [A] Unit construction Front side [B] Scanner unit (B-1) Motor, sensor, lamp A4 series LT series Page (D-2) Motor, sensor, switch, solenoid, lamp, heater, thermistor, thermostat [D] Process unit (D-1) Motor, sensor, switch, clutch, solenoid * ASD/AUD/CND/SAD/TWD models: Standard, NAD/MJD models: Option Page [F] Paper feeder unit [G]Transport unit [H] Bypass unit [I] Automatic duplexing unit [J] Fuser unit [K] Drive unit Page 2.3 Symbols and Functions of Various Components The column "P-I" shows the page and item number in the parts list. (1) Motors (2) Sensors and switches Page (4) Solenoids (3) Electromagnetic clutches (5) PC boards (6) Lamps and heaters (7) Thermistors and thermostats (9) Others (8) Transformer November 2003 TOSHIBA TEC 2 - 21 e-STUDIO3511/4511 OUTLINE OF THE MACHINE 2.4 General Description I/O Laser unit LGCSYSSLGCCD 2.4.1 System block diagram Page Page Page 2.5 Disassembly and Replacement of Covers and PC boards Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page 3. COPY PROCESS 3.1 Expression of Colors and 4-Step Copy Process 3.2 General Description of Copying Process 3.3 Details of Copying Process Page Page Page + Page 3.4 List of Copying Process Conditions Page Page 4. GENERAL OPERATION 4.1 Overview of Operation 4.2 Description of Operation Page Page Page November 2003 TOSHIBA TEC 4 - 5 e-STUDIO3511/4511 GENERAL OPERATION Timing chart for copying (A4/LT size, 1 sheet from upper drawer) Page 4.3 Detection of Abnormality Page Page Page Page 4.4 Flow Chart 4.4.1 Power ON to ready November 2003 TOSHIBA TEC 4 - 13 e-STUDIO3511/4511 GENERAL OPERATION e-STUDIO3511/4511 GENERAL OPERATION 4 - 14 November 2003 TOSHIBA TEC 4.4.2 Automatic feed copying Page e-STUDIO3511/4511 GENERAL OPERATION 4 - 16 November 2003 TOSHIBA TEC 04/05 5. CONTROL PANEL Page 5.2.1 Display Page Page Page Page e-STUDIO3511/4511 CONTROL PANEL 5 - 8 November 2003 TOSHIBA TEC 5.3 Relation between the Equipment State and Operators Operation 5.4 Description of Operation LCD PANEL 640 x 240 DOTS (4) Data Transmission Page 5.5 Disassembly and Replacement ab Page Page 6. SCANNER 6.1 Function 6.2 Construction Page 6.3 Description of Operation November 2003 TOSHIBA TEC 6 - 5 e-STUDIO3511/4511 SCANNER Fig. 6-302 Scan motor PS-ACC-350 PWA-F-SLG PWA-F-SDV-350 Input/output signals Page 6.4 Control of Exposure Lamp Page Page 6.5 General Description of CCD Control 6.6 Automatic Original Size Detection Circuit Page Page Page 6.7 Disassembly and Replacement Page Page Page Page Page Page 7. IMAGE PROCESSING 7.1 General Description The followings are the boards used for image processing. Page 7.2 Configuration The Fig. 7-201 shows the image processing section of this equipment. 7.3 SYS Board (PWA-F-SYS-350) Page axb Page Page Page 7.4 LGC Board (PWA-F-LGC-350) 7.5 Laser Driving PC Board (LDR Board) 8. LASER OPTICAL UNIT 8.1 General Description Page 8.2 Structure Page Page Page 8.3 Laser Diode 8.4 Laser Unit Cooling Fan 8.5 Polygonal Motor LCA301-1 PWA-F-LGC M/DC-POL 8.6 Disassembly and Replacement Page 9. DRIVE SYSTEM 9.1 General Description 9.2 Main Motor Page 9.3 Transport Motor Page 9.4 Developer Motor Page 9.5 Disassembly and Replacement Page Page Page Page Page Page Page Page 10. PAPER FEEDING SYSTEM 10.1 General Descriptions Page Page Page 10.2 Description of Operation A Page Page Page 10.3 Drive Circuit of Tray-up Motor Tray-up motor (TRY-MTR) : Driven by IC6 (upper/lower drawer) (LGC: TA8428) Block diagram of TA8428 10.4 Disassembly and Replacement Page Page Page Page Page Page Page 0.2-0.5mm Page Page Page Page Page 11. DRUM RELATED SECTION 11.1 Construction 11.2 Functions Page 11.3 Output Control Circuits of High-Voltage Transformer 11.4 Drum Temperature Detection Circuit CPU R V 11.5 Temperature/Humidity Sensor 11.6 Charger Wire Cleaner M 11.7 Disassembly and Replacement Page Page Page Page Page Page Page Page Page Page Page 12. DEVELOPER UNIT 12.1 General Description 12.2 Construction Page 12.4 Black Toner Cartridge Drive Unit TD62385 LCA301-2 TA8428K 12.5 Black Developer Unit Page Page Page Page Page 12.6 Color Developer Unit Page Page Page Page 12.7 High-Voltage Transformer Output Control Circuit 12.8 Disassembly and Replacement Page Page Page Page Page Page Page Page Page Page Page Page 13. REVOLVER UNIT 13.1 General Description 13.2 Construction 13.3 Functions Page e-STUDIO3511/4511 REVOLVER UNIT 13 - 4 November 2003 TOSHIBA TEC 13.5 Revolver Motor Drive Circuit Fig. 13-501 13.6 Operation Page 13.7 Disassembly and Replacement Page Page Page Page Page Page Page 14. TRANSFER UNIT 14.1 General Descriptions 14.2 Construction 14.3 Functions Page Page 14.6 High-Voltage Power Supply 14.7 Disassembly and Replacement Page Page Page Page Page Page Page Page Page Page Page Page Page Page 15. IMAGE QUALITY CONTROL 15.1 General Description 15.2 Principle of the Sensor 15.3 Flow Chart of Control Procedure 15.4 Construction 15.5 Disassembly and Replacement 16. FUSER UNIT / PAPER EXIT SECTION 16.1 General Description 16.2 Operation 16.3 Functions Page e-STUDIO3511/4511 FUSER UNIT/PAPER EXIT SECTION 16 - 4 November 2003 TOSHIBA TEC 16.4 Heater Control Circuit Fig. 16-401 16.4.1 Configuration [Block diagram of fuser unit and IH control circuit] Page Page 16.4.4 Relation between system configuration and IH output for NAD, SAD, TWD: for ASD, AUD, CND: Page Page Page Page * Condtion: Priority of error checking. Page (2) IH error November 2003 TOSHIBA TEC 16 - 15 e-STUDIO3511/4511 FUSER UNIT/PAPER EXIT SECTION 16.5 Control Circuit of Exit Motor Fig. 16-601 G14 G22 15) Exit motor G24 G20 G48 G16 16.7 Disassembly and Replacement Page Page Page Page Page Page Page Page Page Page Page FLOW 17. AUTOMATIC DUPLEXING UNIT (ADU) 17.1 General Description 17.2 Description of Operations Page Page Page Timing chart for duplex copying from upper drawer (A4, 3 sheets) ADU Equipment Timing chart for duplex copying from upper drawer (A3, 1 sheet) ADU Equipment Page 17.4 Flow Chart A A Yes No 18. POWER SUPPLY UNIT 18.1 Construction 18.2 Operation of DC Output Circuits 18.3 Output Channel Page 18.4 Fuse November 2003 TOSHIBA TEC 18 - 5 e-STUDIO3511/4511 POWER SUPPLY UNIT 18.5 Configuration of Power Supply Unit OFF ON AC input PWR-EN PWR-DN 18.6 Sequence of Power Supply November 2003 TOSHIBA TEC 18 - 7 e-STUDIO3511/4511 POWER SUPPLY UNIT 18.7 AC Wire Harness SAD,TWD NAD,MODELS: MJD MODEL: ( RY NF PS-IH AC ADAPTER