Toshiba e-STUDIO555 Service Manual page 13

9.4.1 General description............................................................................................ 9-4
9.4.2 Description of operation..................................................................................... 9-5
9.5 Drum Surface Potential Sensor Control Circuit................................................................. 9-6
9.5.1 General description............................................................................................ 9-6
9.5.2 Configuration ..................................................................................................... 9-6
9.5.3 Description of operation..................................................................................... 9-7
9.6 Temperature/humidity detection circuit ............................................................................. 9-8
9.6.1 Outline ............................................................................................................... 9-8
9.6.2 Construction....................................................................................................... 9-8
9.7 Disassembly and Replacement......................................................................................... 9-9
10. DRUM/CLEANER UNIT .............................................................................................. 10-1
10.1 Construction .................................................................................................................... 10-1
10.2 Functions......................................................................................................................... 10-2
10.3 Drum Temperature Detection Circuit .............................................................................. 10-3
10.4 Image Quality Control ..................................................................................................... 10-4
10.4.1 Outline ............................................................................................................. 10-4
10.4.2 Construction..................................................................................................... 10-4
10.4.3 Principle of Image Quality Sensor ................................................................... 10-5
10.4.4 Flow of control ................................................................................................. 10-5
10.5 Drum motor control circuit ............................................................................................... 10-6
10.6 Disassembly and Replacement....................................................................................... 10-7
11. DEVELOPER UNIT ..................................................................................................... 11-1
11.1 Construction .................................................................................................................... 11-1
11.2 Functions......................................................................................................................... 11-2
11.3 Developer Unit Drive ....................................................................................................... 11-6
11.4 Motor Control Circuit ....................................................................................................... 11-7
11.4.1 New toner supply motor control circuit............................................................. 11-7
11.4.2 Developer unit motor control circuit ................................................................. 11-8
11.5 Auto-toner Circuit ............................................................................................................ 11-9
11.5.1 General description.......................................................................................... 11-9
11.5.2 Operation of auto-toner sensor ...................................................................... 11-11
11.6 Disassembly and Replacement..................................................................................... 11-12
12. TRANSFER/TRANSPORT UNIT ................................................................................ 12-1
12.1 General Description ........................................................................................................ 12-1
12.2 Functions......................................................................................................................... 12-2
12.3 General Description of Transfer Belt Unit Operation....................................................... 12-3
12.4 Transfer belt motor control circuit.................................................................................... 12-4
12.5 Disassembly and Replacement....................................................................................... 12-5
13. FUSER UNIT ............................................................................................................... 13-1
13.1 Outline............................................................................................................................. 13-1
13.2 Operation ........................................................................................................................ 13-1
13.3 Functions......................................................................................................................... 13-2
13.4 Fuser Control Circuit ....................................................................................................... 13-3
13.4.1 Configuration ................................................................................................... 13-3
13.4.2 Heating principle of IH coil ............................................................................... 13-4
13.4.3 IH control circuit interface ................................................................................ 13-5
13.4.4 Abnormality in the IH control circuit ................................................................. 13-5
13.4.5 Temperature detection section ........................................................................ 13-7
13.5 Fuser Motor Control Circuit ........................................................................................... 13-13
13.6 Disassembly and Replacement..................................................................................... 13-15
14. EXIT/REVERSE SECTION.......................................................................................... 14-1
14.1 General Description ........................................................................................................ 14-1
14.2 Functions......................................................................................................................... 14-1
14.3 Driving of Exit/Reverse section ....................................................................................... 14-2
14.4 Operation ........................................................................................................................ 14-2
14.5 Exit motor control circuit.................................................................................................. 14-7
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