Toshiba e-STUDIO2500c Service Manual page 6

6.4.2 Initialization at power-ON ......................................................................................... 6-7
6.5 Electric Circuit Description................................................................................................... 6-8
6.5.1 Scan motor control circuit ......................................................................................... 6-8
6.5.2 Exposure Lamp Control Circuit ................................................................................ 6-9
6.5.3 General Description of CCD Control ...................................................................... 6-12
6.5.4 Automatic Original Size Detection Circuit............................................................... 6-13
6.6 Disassembly and Replacement ......................................................................................... 6-18
7. IMAGE PROCESSING .................................................................................................. 7-1
7.1 General Description ............................................................................................................. 7-1
7.2 Configuration ....................................................................................................................... 7-3
7.3 IMAGE PROCESSING PC BOARD (IMG) .......................................................................... 7-4
7.3.1 Features ................................................................................................................... 7-4
7.3.2 Functions of image processing circuit ...................................................................... 7-4
7.4 SYSTEM CONTROL PC BOARD (SYS) ............................................................................. 7-8
7.4.1 Features ................................................................................................................... 7-8
7.4.2 Functions of image processing circuit ...................................................................... 7-8
7.5 LOGIC PC BOARD (LGC) ................................................................................................... 7-9
7.5.1 Features ................................................................................................................... 7-9
7.5.2 Functions of image processing circuit ...................................................................... 7-9
8. LASER OPTICAL UNIT ................................................................................................ 8-1
8.1 General Description ............................................................................................................. 8-1
8.2 Structure .............................................................................................................................. 8-3
8.3 Electric Circuit Description................................................................................................... 8-8
8.3.1 Laser diode control circuit ........................................................................................ 8-8
8.3.2 Polygonal motor control circuit ................................................................................. 8-9
8.3.3 Mirror motor control circuit...................................................................................... 8-10
8.4 Disassembly and Replacement ......................................................................................... 8-12
9. DRIVE SYSTEM ............................................................................................................ 9-1
9.1 General Description ............................................................................................................. 9-1
10. PAPER FEEDING SYSTEM........................................................................................ 10-1
10.1 General Descriptions ......................................................................................................... 10-1
10.2 Composition....................................................................................................................... 10-2
10.3 Functions ........................................................................................................................... 10-3
10.4 Description of Operation .................................................................................................... 10-5
10.4.1 Drive of rollers ........................................................................................................ 10-5
10.4.2 Operation of bypass pickup roller ........................................................................... 10-6
10.4.3 Operation of drawer pickup roller ........................................................................... 10-7
10.4.4 Separation of paper ................................................................................................ 10-8
10.4.5 General operation................................................................................................... 10-9
10.5 Electric Circuit Description............................................................................................... 10-11
10.5.1 Tray-up motor control circuit................................................................................. 10-11
10.5.2 Registration motor control circuit .......................................................................... 10-12
10.5.3 Feed/Transport motor control circuit .................................................................... 10-13
10.6 Disassembly and Replacement ....................................................................................... 10-14
11. PROCESS UNIT RELATED SECTION....................................................................... 11-1
11.1 General description............................................................................................................ 11-1
11.2 Composition....................................................................................................................... 11-2
11.3 Functions ........................................................................................................................... 11-3
11.4 Electric Circuit Description................................................................................................. 11-5
11.4.1 High-voltage transformer control circuit.................................................................. 11-5
11.4.2 Drum Temperature Detection Circuit...................................................................... 11-7
11.4.3 Drum motor control circuit ...................................................................................... 11-8
11.4.4 Drum switching motor control circuit....................................................................... 11-9
e-STUDIO2500c/3500c/3510c CONTENTS
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May 2006 © TOSHIBA TEC