Toshiba e-studio 207 - Page 6

e-STUDIO167/207/237 © 2007 - 2008 TOSHIBA TEC CORPORATION All rights reserved
CONTENTS
2
6.4.1 Scanning operation .................................................................................................. 6-5
6.4.2 Scan motor drive circuit ............................................................................................ 6-6
6.5 Contact Image Sensor Unit Control Circuit.......................................................................... 6-8
6.5.1 Exposure LED control circuit .................................................................................... 6-8
6.5.2 CCD control circuit ................................................................................................... 6-9
6.6 Automatic Original Size Detection Circuit .......................................................................... 6-12
6.6.1 Principle of original size detection .......................................................................... 6-12
6.6.2 Process of detection of original size ....................................................................... 6-13
6.7 Disassembly and Replacement ......................................................................................... 6-17
7. IMAGE PROCESSING .................................................................................................. 7-1
7.1 General Description ............................................................................................................. 7-1
7.2 Configuration ....................................................................................................................... 7-2
7.3 MAIN Board ......................................................................................................................... 7-3
7.3.1 Features ...................................................................................................................7-3
7.3.2 Functions of image processing circuit ...................................................................... 7-4
8. LASER OPTICAL UNIT ................................................................................................ 8-1
8.1 General Description ............................................................................................................. 8-1
8.2 Structure .............................................................................................................................. 8-2
8.3 Laser Diode Control Circuit..................................................................................................8-5
8.4 Polygonal Motor Control Circuit ........................................................................................... 8-6
8.5 Disassembly and Replacement ........................................................................................... 8-7
9. DRIVE UNIT .................................................................................................................. 9-1
9.1 General Description ............................................................................................................. 9-1
9.2 Configuration ....................................................................................................................... 9-2
9.3 Functions ............................................................................................................................ 9-3
9.4 Main Motor Control Circuit ...................................................................................................9-4
9.5 Disassembly and Replacement ........................................................................................... 9-6
10. PAPER FEEDING SYSTEM........................................................................................ 10-1
10.1 General Description ........................................................................................................... 10-1
10.2 Configuration ..................................................................................................................... 10-2
10.3 Functions ........................................................................................................................... 10-3
10.4 Operation ........................................................................................................................... 10-5
10.4.1 Drawer....................................................................................................................10-5
10.4.2 Bypass tray............................................................................................................. 10-7
10.4.3 General operation................................................................................................... 10-9
10.5 Disassembly and Replacement ....................................................................................... 10-10
11. DRUM RELATED SECTION ....................................................................................... 11-1
11.1 General Description ........................................................................................................... 11-1
11.2 Configuration ..................................................................................................................... 11-2
11.3 Functions ........................................................................................................................... 11-3
11.4 High-Voltage Output Control Circuit .................................................................................. 11-5
11.4.1 General description ................................................................................................ 11-5
11.4.2 Description of Operation......................................................................................... 11-6
11.5 Drum Temperature Detection Circuit ................................................................................. 11-7
11.5.1 General description ................................................................................................ 11-7
11.5.2 Circuit configuration................................................................................................ 11-7
11.6 Temperature/Humidity Detection Circuit............................................................................ 11-8
11.6.1 General Description................................................................................................ 11-8
11.6.2 Circuit configuration................................................................................................ 11-8
11.7 Disassembly and Replacement ......................................................................................... 11-9
12. DEVELOPMENT SYSTEM.......................................................................................... 12-1
12.1 General Description ........................................................................................................... 12-1