Toshiba e-STUDIO 200L Service Manual page 3

6. SCANNER ..................................................................................................................... 6-1
6.1 Function ............................................................................................................................... 6-1
6.2 Construction......................................................................................................................... 6-2
6.3 Description of Operation ...................................................................................................... 6-4
6.3.1 Scan motor ............................................................................................................... 6-4
6.3.2 Scanning drive circuit ............................................................................................... 6-5
6.3.3 Initialization at power-ON ......................................................................................... 6-7
6.4 Control of Exposure Lamp ................................................................................................... 6-8
6.4.1 General description .................................................................................................. 6-8
6.4.2 Exposure lamp ......................................................................................................... 6-9
6.4.3 Control circuit for the exposure lamp...................................................................... 6-10
6.5 General Description of CCD Control.................................................................................. 6-11
6.5.1 Opto-electronic conversion..................................................................................... 6-11
6.5.2 Shading correction ................................................................................................. 6-11
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 ....................................................................................................................... 7-3
7.3 SLG Board ........................................................................................................................... 7-4
7.3.1 Features ................................................................................................................... 7-4
7.3.2 Functions of image processing circuit ...................................................................... 7-4
7.4 LGC Board........................................................................................................................... 7-8
7.4.1 Features ................................................................................................................... 7-8
7.4.2 Functions of image processing circuit ...................................................................... 7-8
7.5 Laser Driving PC Board ....................................................................................................... 7-9
8. LASER OPTICAL UNIT ................................................................................................ 8-1
8.1 General Description ............................................................................................................. 8-1
8.2 Structure .............................................................................................................................. 8-3
8.3 Laser Diode ......................................................................................................................... 8-6
8.4 Polygonal Motor................................................................................................................... 8-7
8.5 Internal cooling fan-2 ........................................................................................................... 8-8
8.6 Disassembly and Replacement ........................................................................................... 8-9
9. PAPER FEEDING SYSTEM.......................................................................................... 9-1
9.1 Functions ............................................................................................................................. 9-1
9.2 Operation ............................................................................................................................. 9-5
9.2.1 Operation of bypass pickup roller ............................................................................. 9-5
9.2.2 Operation of drawer pickup roller ............................................................................. 9-6
9.2.3 Separation of paper .................................................................................................. 9-7
9.2.4 Operation of clutch ................................................................................................... 9-8
9.2.5 General operation..................................................................................................... 9-9
9.3 Drive Circuit of Tray-up Motor............................................................................................ 9-11
9.4 Disassembly and Replacement ......................................................................................... 9-13
10. DRIVE SYSTEM .......................................................................................................... 10-1
10.1 General Description ........................................................................................................... 10-1
10.2 Functions ........................................................................................................................... 10-2
10.3 Main Motor......................................................................................................................... 10-3
10.3.1 Main motor drive..................................................................................................... 10-3
10.3.2 Control signals........................................................................................................ 10-4
10.4 Disassembly and Replacement ......................................................................................... 10-5
e-STUDIO200L/202L/230/232/280/282 CONTENTS
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June 2004 © TOSHIBA TEC