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