COPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)viCHAPTER 4 IMAGE FORMATION SYSTEMI. PROCESSES .....................................4-1A. Outline ...........................................4-1B. Basic Sequence of Operations(image formation) ..........................4-2C. Controlling the Scanner Lamp.......4-31. Outline ......................................4-32. Turning On and Off theScanning Lamp ........................4-43. Detecting the Activation of theScanning Lamp ........................4-44. Protection Mechanism..............4-4D. Controlling the Primary/Transfer Corona Currentand the Grid Bias ..........................4-51. Outline ......................................4-52. Controlling the Primary/TransferCorona Current.........................4-63. Keeping the Primary/TransferCorona Current at a SpecificLevel .........................................4-74. Turning On and Off theGrid Bias...................................4-8E. Controlling the Static EliminatorBias/Fixing Roller Bias ..................4-91. Outline ......................................4-92. Turning ON/OFF the StaticEliminator Bias/Fixing Bias.......4-103. Switching the Output of theStatic Eliminating Bias..............4-104. Preventing Separation Faults(thin paper picked up fromthe multifeeder) .......................4-10F. Controlling the Developing Bias ....4-111. Outline ......................................4-112. Turning On and Off DCComponent of the DevelopingBias and Controlling theVoltage Level............................4-123. Turning On and Off the ACComponent of theDeveloping Bias .......................4-134. Sequence of Operations(developing bias) .....................4-13G. Controlling Blank Exposure ...........4-141. Outline ......................................4-142. Operation..................................4-153. Controlling the Slide Shutters...4-15H. Mesuring the Density ofOriginals ........................................4-161. Outline ......................................4-162. Operation..................................4-173. AE Adjustment..........................4-18I. Cleaning the Transfer ChargingWire ...............................................4-191. Outline ......................................4-192. Operation..................................4-19II. DEVELOPING ASSEMBLY/DRUM CLEANER...............................4-21I. BASIC OPERATION...........................3-1A. Varying the Reproduction Ratio.....3-1II. LENS DRIVE SYSTEM ......................3-2A. Movement of the Lens...................3-21. Outline ......................................3-22. Lens Motor Drive Circuit...........3-43. Focusing ...................................3-5III. SCANNER DRIVE MECHANISM .......3-6A. Driving the Scanner.......................3-61. Outline ......................................3-62. Scanning Motor Control Circuit ..3-73. Relationship between ScannerSensor and Signals ..................3-104. Sequence of ScannerMovements (Enlarge/Reduce) ..3-105. Sequence of ScannerMovements (page separationmode, 2 copies)........................3-11IV. OTHERS.............................................3-13A. Controlling the Detection ofOriginal Sizes.................................3-131. Outline ......................................3-132. Operation..................................3-153. Identifying the Size of Originals ..3-164. Identifying the Size of Originalsby the Document Feeder..........3-17V. DISASSEMBLY AND ASSEMBLY......3-19A. Scanner Drive Assembly ...............3-191. Removing the Scanner Motor ..3-192. Outline of the ScannerDrive Cable...............................3-203. Removing the ScannerDrive Cable...............................3-214. Routing the Scanner Cable ......3-26B. Lens Drive Assembly.....................3-301. Removing the Lens Motor ........3-302. Attaching the Lens Drive Belt...3-313. Removing the Lens hood ..........3-32CHAPTER 3 EXPOSURE SYSTEM
