Toshiba e-STUDIO520 Service Manual page 8

6.4.2 Exposure lamp ......................................................................................................... 6-7
6.4.3 Control circuit for exposure lamp.............................................................................. 6-8
6.5 CCD Control ........................................................................................................................ 6-9
6.5.1 Opto-electronic conversion....................................................................................... 6-9
6.5.2 Shading correction ................................................................................................... 6-9
6.6 Automatic Original Size Detection Circuit .......................................................................... 6-10
6.6.1 Principle of original size detection .......................................................................... 6-10
6.6.2 Process of original size detection ........................................................................... 6-11
6.7 Disassembly and Replacement ......................................................................................... 6-15
7. IMAGE PROCESSING .................................................................................................. 7-1
7.1 General Description ............................................................................................................. 7-1
7.2 Configuration ....................................................................................................................... 7-3
7.3 Scanning Section Control PC Board (SLG) ......................................................................... 7-4
7.3.1 Features ................................................................................................................... 7-4
7.3.2 Functions of image processing................................................................................. 7-4
7.4 Laser Control PC Board (PLG) ............................................................................................ 7-8
7.4.1 Features ................................................................................................................... 7-8
7.4.2 Functions of image processing................................................................................. 7-8
7.5 Laser Driving PC Board (LDR) ............................................................................................ 7-9
8. LASER OPTICAL UNIT ................................................................................................ 8-1
8.1 General Description ............................................................................................................. 8-1
8.2 Structure .............................................................................................................................. 8-4
8.2.1 Laser optical unit ...................................................................................................... 8-4
8.2.2 Polygonal motor unit................................................................................................. 8-5
8.2.3 fT lenses 1 and 2 ...................................................................................................... 8-7
8.2.4 H-sync detection PC board (SNS board) ................................................................. 8-7
8.2.5 Laser driving board (LDR1/LDR2 board).................................................................. 8-7
8.2.6 Slit glass ................................................................................................................... 8-8
8.3 Laser Diode Control Circuit.................................................................................................. 8-9
8.4 Polygonal Motor Control Circuit ......................................................................................... 8-10
8.5 Laser Unit Cooling Fan Control Circuit .............................................................................. 8-11
8.6 Disassembly and Replacement ......................................................................................... 8-12
9. PAPER FEEDING SYSTEM.......................................................................................... 9-1
9.1 General Description ............................................................................................................. 9-1
9.2 Functions ............................................................................................................................. 9-4
9.3 Operation ............................................................................................................................. 9-6
9.3.1 Operation of bypass pickup roller ............................................................................. 9-6
9.3.2 Operation of drawer pickup roller ............................................................................. 9-7
9.3.3 Paper separation ...................................................................................................... 9-7
9.3.4 Driving ...................................................................................................................... 9-9
9.3.5 General operation................................................................................................... 9-10
9.3.6 Description of Tandem LCF Operation................................................................... 9-12
9.4 Tray-up motor control circuit .............................................................................................. 9-15
9.5 Feed motor control circuit .................................................................................................. 9-16
9.6 Transport motor control circuit ........................................................................................... 9-17
9.7 Registration motor control circuit ....................................................................................... 9-18
9.8 Tandem LCF tray-up motor / end fence motor .................................................................. 9-19
9.9 Disassembly and Replacement ......................................................................................... 9-20
10. PROCESS RELATED SECTION ................................................................................ 10-1
10.1 Construction....................................................................................................................... 10-1
10.2 Functions ........................................................................................................................... 10-2
10.3 Charger Wire Cleaner Control Circuit ................................................................................ 10-3
10.3.1 General description ................................................................................................ 10-3
e-STUDIO520/600/720/850 CONTENTS
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March 2005 © TOSHIBA TEC