Service manual

Chapter 2 Operating Principles
Table of Contents
2.1 ENGINE OPERATIONS 2-1
2.1.1 ScannerHeadOperations.....................................2-1
2.1.2 CarriageOperations..........................................2-4
2.2 POWER SUPPLY OPERATIONS 2-5
2.2.1 PowerSupplyOverview.......................................2-5
2.2.2 SupplyCircuitOperations......................................2-5
2.3 CONTROL CIRCUITS 2-7
2.3.1 ControlCircuitOutline ........................................2-7
2.3.2 ResetCircuit...............................................2-10
2.3.3 Home-PositionSensorCircuit .................................2-10
2.3.4 CarriageMotorDriveCircuit...................................2-11
2.3.5 ImageSensorDriveCircuit ...................................2-12
List of Figures
Figure2-1. Cross-sectionoftheScannerHead.........................2-1
Figure2-2. FunctionsofImageSensorMechanism......................2-1
Figure 2-3. Operations of the Photosensitive Section. . . . . . . . . . . . . . . . . . . . . 2-2
Figure2-4. ArrangementofPhotosensors .............................2-2
Figure 2-5. Operations of the Transmission Section. . . . . . . . . . . . . . . . . . . . . . 2-3
Figure2-6. ReadingofanOriginalDocument...........................2-4
Figure 2-7. Carriage Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Figure2-8. PowerSupplyCircuitBlockDiagram ........................2-6
Figure2-9. ControlCircuitBlockDiagram..............................2-7
Figure2-10. SequenceofOperations.................................2-8
Figure2-11. BlockDiagramforResetCircuit..........................2-10
Figure 2-12. Block Diagram of Home Position Sensor Circuit . . . . . . . . . . . . . 2-10
Figure 2-13. Block Diagram of Carriage Motor Drive Circuit. . . . . . . . . . . . . . . 2-11
Figure2-14. InternalWiringoftheMotor..............................2-11
Figure2-15. ImageSensorDriveCircuit..............................2-12
Figure 2-16. Image Sensor Control Process. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Figure 2-17. Lamp Control Circuit Block Diagram. . . . . . . . . . . . . . . . . . . . . . . 2-13
List of Tables
Table2-1. PowerSupplyBoards.....................................2-5
Table 2-2. Power Supply Output Voltages and Applications. . . . . . . . . . . . . . . . 2-5
Table2-3. FunctionsofMainElements................................2-9
Table 2-4. Inputs and Outputs of the M54670P Motor Driver . . . . . . . . . . . . . . 2-11
Table2-5. ExcitationSequence ....................................2-11