Toshiba e-STUDIO453 Service Manual page 7

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
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 . .............................................................................9-5
9.2.3 Separation of paper ..................................................................................................9-6
9.2.4 General operation .....................................................................................................9-7
9.3 Drive Circuit of Tray-up Motor ..............................................................................................9-9
9.4 Disassembly and Replacement . .........................................................................................9-10
10. DRIVE SYSTEM ..........................................................................................................10-1
10.1 General Description ...........................................................................................................10-1
10.2 Functions . ...........................................................................................................................10-1
10.3 Main Motor .........................................................................................................................10-2
10.3.1 Main motor drive .....................................................................................................10-2
10.3.2 Control signals ........................................................................................................10-3
10.4 Disassembly and Replacement . .........................................................................................10-4
11. DRUM RELATED SECTION........................................................................................ 11-1
11.1 Configuration . .....................................................................................................................11-1
11.2 Functions . ...........................................................................................................................11-2
11.3 Output Control Circuits of High-Voltage Transformer . ........................................................11-5
11.3.1 Overview .................................................................................................................11-5
11.3.2 Description of operations ........................................................................................11-5
11.4 Drum Temperature Detection Circuit ..................................................................................11-7
11.5 Temperature/Humidity Sensor . ...........................................................................................11-8
11.5.1 General description . ................................................................................................11-8
11.5.2 Construction . ...........................................................................................................11-8
11.6 Disassembly and Replacement . .........................................................................................11-9
12. DEVELOPMENT SYSTEM ..........................................................................................12-1
12.1 Configuration . .....................................................................................................................12-1
12.2 Functions . ...........................................................................................................................12-2
12.3 Drive Circuit of Toner Motor ..............................................................................................12-3
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 e-STUDIO350/352/353/450/452/453
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