COPYRIGHT © 1997 CANON INC. CANON NP6350/NP6251 REV.0 JULY 1997 PRINTED IN JAPAN (IMPRIMÉ AU JAPON)viI. PROCESSES .....................................4-1A. Controlling the Drum SurfacePotential.........................................4-11. Outline ......................................4-12. Control Method.........................4-23. Potential Measurement Circuit..4-4B. Controlling the Intensity of theScanning Lamp .............................4-61. Outline ......................................4-62. Operation..................................4-73. Auto Exposure Control .............4-74. Making Checks.........................4-10C. Controlling the Primary/TransferCorona Current..............................4-111. Outline ......................................4-112. Controlling the PrimaryCorona Current.........................4-113. Controlling the TransferCorona Current.........................4-13D. Controlling the Separation/Pre-Transfer Corona Current ...............4-151. Outline ......................................4-152. Turning ON and OFF theSeparation/ Pre-TransferCorona Current.........................4-163. Separation Corona Current(DC component) .......................4-174. Pre-Transfer Corona Current(DC component) .......................4-175. Controlling the DC Componentof the Separation/Pre-TransferCorona Current.........................4-18E. Controlling the Blanking ExposureLamp (LED) ...................................4-191. Outline ......................................4-192. Controlling the Activation inReduce Mode ...........................4-193. Controlling the Activation inDirect Mode ..............................4-194. Controlling the Activation inSheet Frame Erase Mode ........4-195. Controlling the Activation inOriginal Frame Erase Mode .....4-206. Controlling the Activation inBook Frame Erase Mode .........4-207. Controlling the Activation inHole Image Erase Mode ..........4-218. Controlling the Activation inAE Mode...................................4-21F. Drum Heater Circuit.......................4-221. Outline ......................................4-222. Idle Rotation of thePhotosensitive Drum and theDeveloping Cylinder .................4-24G. Cleaning the Primary ChargingWire ...............................................4-251. Outline ......................................4-252. Automatic CleaningMechanism ...............................4-25H. Pre-Transfer/Transfer/SeparationCharging Wire AutomaticCleaning Mechanism .....................4-26II. DRUM CLEANING ASSEMBLY/DEVELOPING ASSEMBLY ...............4-28A. Outline ...........................................4-28B. Detecting the Level of Toner andControlling the Supply Operation ..4-30C. Controlling the DevelopingBias/Roller Electrode .....................4-321. Outline ......................................4-322. Control Timing ..........................4-323. Developing Bias ControlCircuit .......................................4-354. Roller Electrode Bias ControlCircuit .......................................4-36D. Detecting the Waste Toner FeedingScrew (locking) ..............................4-38III. DISASSEMBLY AND ASSEMBLY......4-39CHAPTER 4 IMAGE FORMATION SYSTEM2. Routing the Scanner DriveCable ........................................3-263. Orienting the Heat AbsorbingGlass ........................................3-264. Removing the Scanner DriveCable ........................................3-275. Adjusting the Tension of theScanner Drive Cable ................3-296. Positioning the Mirror ...............3-297. Adjusting the Scanner HomePosition.....................................3-308. Positioning the Scanner LockingSolenoid (SL1)..........................3-31B. Lens Drive Assembly.....................3-321. Removing the Lens Y DirectionDrive Motor...............................3-322. Removing the Lens StageTemporarily ...............................3-343. Installing the Light-BlockingBelt Mount ................................3-354. Removing the Lens X DirectionDrive Motor...............................3-365. Attaching the Lens X DirectionDrive Belt..................................3-376. Routing the Light-BlockingBelt ...........................................3-377. Replacing the Light-Blocking Belt.............................3-38
