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November 2003 © TOSHIBA TEC iii e-STUDIO3511/4511 CONTENTS
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 Unit Cooling Fan ...................................................................................................... 8-8
8.5 Polygonal Motor ................................................................................................................. 8-8
8.6 Disassembly and Replacement.......................................................................................... 8-9
9. DRIVE SYSTEM ............................................................................................................ 9-1
9.1 General Description ........................................................................................................... 9-1
9.2 Main Motor ......................................................................................................................... 9-2
9.2.1 Construction ............................................................................................................ 9-2
9.2.2 Drive circuit of main motor ...................................................................................... 9-3
9.2.3 Signal level of motor circuit ..................................................................................... 9-3
9.3 Transport Motor.................................................................................................................. 9-4
9.3.1 Construction ............................................................................................................ 9-4
9.3.2 Drive circuit of transport motor ................................................................................ 9-5
9.4 Developer Motor ................................................................................................................ 9-6
9.4.1 Construction ............................................................................................................ 9-6
9.4.2 Drive circuit of developer motor .............................................................................. 9-7
9.5 Disassembly and Replacement.......................................................................................... 9-8
10. PAPER FEEDING SYSTEM ........................................................................................ 10-1
10.1 General Descriptions ....................................................................................................... 10-1
10.2 Description of Operation .................................................................................................. 10-5
10.2.1 Operation of bypass pickup roller ......................................................................... 10-5
10.2.2 Operation of drawer pickup roller .......................................................................... 10-6
10.2.3 Separation of paper .............................................................................................. 10-7
10.2.4 General operation ................................................................................................. 10-8
10.3 Drive Circuit of Tray-up Motor ........................................................................................ 10-10
10.4 Disassembly and Replacement...................................................................................... 10-11
11. DRUM RELATED SECTION ....................................................................................... 11-1
11.1 Construction ..................................................................................................................... 11-1
11.2 Functions ......................................................................................................................... 11-2
11.3 Output Control Circuits of High-Voltage Transformer ....................................................... 11-4
11.4 Drum Temperature Detection Circuit ................................................................................ 11-5
11.5 Temperature/Humidity Sensor.......................................................................................... 11-6
11.5.1 General description ............................................................................................... 11-6
11.5.2 Construction.......................................................................................................... 11-6
11.6 Charger Wire Cleaner ...................................................................................................... 11-7
11.6.1 Operation .............................................................................................................. 11-7
11.6.2 Construction.......................................................................................................... 11-7
11.6.3 Drive circuit ........................................................................................................... 11-8
11.7 Disassembly and Replacement........................................................................................ 11-9