Toshiba e-STUDIO 282L Service Manual - Page 3

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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