Toshiba ESTUDIO170F, Service Manual

Page: 4 / 492

CONTENTS January 2005 © TOSHIBA TEC
2
4.2.1 FUNC 0-39 ............................................................................................................. 4-44
4.2.2 TEL FUNC 0-8........................................................................................................ 4-85
4.2.3 UAD 0-19................................................................................................................ 4-94
4.2.4 EX TYPE .............................................................................................................. 4-118
4.2.5 ACC DGT 1-2 ....................................................................................................... 4-119
4.2.6 PC FUNC 0-7 ....................................................................................................... 4-121
5. Mechanical Description............................................................................................... 5-1
5.1 Basic Components............................................................................................................... 5-1
5.2 Transmission Section .......................................................................................................... 5-2
5.2.1 Actions of Transmission Section .............................................................................. 5-2
5.2.2 Components of Transmission Section...................................................................... 5-4
5.3 Reception Section................................................................................................................ 5-7
5.3.1 Actions of Reception Section ................................................................................... 5-7
5.3.2 Components of Reception Section ........................................................................... 5-8
5.3.3 Laser Exposure Section ......................................................................................... 5-10
5.3.4 Process Unit ........................................................................................................... 5-11
5.3.5 Fusing Section........................................................................................................ 5-16
5.3.6 Paper Pickup Section ............................................................................................. 5-19
5.3.7 Exit Section ............................................................................................................ 5-21
6. PBA Outline and Sensor Functions ........................................................................... 6-1
6.1 Electrical Components......................................................................................................... 6-1
6.2 PC Board Layout ................................................................................................................. 6-2
6.3 Connector Layout of PC Board............................................................................................ 6-4
6.3.1 Main PBA ................................................................................................................. 6-4
6.3.2 NCU PBA ................................................................................................................. 6-5
6.3.3 LVPS ........................................................................................................................ 6-6
6.3.4 HVPS........................................................................................................................ 6-7
6.3.5 TEL PBA (US/CA models: Option, SG/HK models: Standard)................................. 6-7
6.3.6 Optional tray PBA..................................................................................................... 6-8
6.3.7 Operation panel PBA................................................................................................ 6-8
6.4 Sensors ............................................................................................................................... 6-9
6.4.1 Sensor Layout .......................................................................................................... 6-9
6.4.2 Table of Sensors .................................................................................................... 6-11
6.4.3 Function of Each sensor......................................................................................... 6-12
7. Circuit Description....................................................................................................... 7-1
7.1 Outline ................................................................................................................................. 7-1
7.1.1 Circuit Connection Diagram ..................................................................................... 7-2
7.1.2 Block Diagram .......................................................................................................... 7-4
7.1.3 PBA Major Device Diagrams .................................................................................... 7-5
7.1.4 Power Supply Table ................................................................................................. 7-8
7.2 Flow of Image Signals ......................................................................................................... 7-9
7.2.1 Facsimile Transmission ............................................................................................ 7-9
7.2.2 Facsimile Reception ............................................................................................... 7-11
7.2.3 Copy ....................................................................................................................... 7-13
7.2.4 PC Interface ........................................................................................................... 7-15
7.3 MAIN PBA.......................................................................................................................... 7-23
7.3.1 Memory Circuit ....................................................................................................... 7-24
7.3.2 Scanning Control Circuit......................................................................................... 7-26
7.3.3 LSU Drive Circuit.................................................................................................... 7-27
7.3.4 Fuser Control Circuit .............................................................................................. 7-28
7.3.5 Reset Circuit........................................................................................................... 7-30
7.3.6 Super Power Save Circuit ...................................................................................... 7-31
7.3.7 Toner Empty Detect Circuit .................................................................................... 7-34
7.3.8 RX Motor Drive Circuit............................................................................................ 7-35