Toshiba e-STUDIO350 Service Manual page 6

5.4 Description of Operation ..................................................................................................... 5-9
5.4.1 Dot matrix LCD circuit .............................................................................................. 5-9
5.4.2 LED display circuit ................................................................................................. 5-11
5.5 Disassembly and Replacement ........................................................................................ 5-12
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 ...................................................................... 6-12
6.7 Disassembly and Replacement ........................................................................................ 6-16
7. IMAGE PROCESSING ................................................................................................... 7-1
7.1 General Description ............................................................................................................ 7-1
7.2 Configuration ...................................................................................................................... 7-3
7.3 SLG Board (PWA-F-SLG-360) ........................................................................................... 7-4
7.3.1 Features .................................................................................................................. 7-4
7.3.2 Functions of image processing circuit ...................................................................... 7-5
7.4 LGC Board (PWA-F-LGC-360) ........................................................................................... 7-9
7.4.1 Features .................................................................................................................. 7-9
7.4.2 Functions of image processing circuit ....................................................................... 7-9
7.5 Laser Driving PC Board .................................................................................................... 7-10
8. LASER OPTICAL UNIT .................................................................................................. 8-1
8.1 General Description ............................................................................................................ 8-1
8.2 Structure ............................................................................................................................. 8-3
8.3 Laser Diode ........................................................................................................................ 8-7
8.4 Laser Optical Unit Cooling Fan ........................................................................................... 8-8
8.5 Polygonal Motor .................................................................................................................. 8-8
8.6 Disassembly and Replacement .......................................................................................... 8-9
e-STUDIO3511/4511 CONTENTS ii November 2003 © TOSHIBA TEC