COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)2. Color Developing Bias Generation CircuitThis circuit is controlled by three signals (Figure 4-605) from the DC controller PCB,and generates the color developing DC bias and color developing AC bias for applicationto the color developing cylinder.The color developing AC bias drive signal is used to turn on and off the AC biasapplied to the color developing cylinder, while the color developing DC bias drive signalis used to turn on and off the DC bias applied to the color developing cylinder.The color developing bias level control signal, on the other hand, is used to switch thelevels of the color developing DC bias for image areas.Figure 4-605Note:The color developing DC bias level for image areas is varied in response to the den-sity command from the printer board*1 or based on the result of image density cor-rection control (p. 4-21).*1 Rear controller PCB (when making prints with the reader unit installed).CHAPTER 4 IMAGE FORMATION SYSTEM4-28DC controllerPCB Colordeveloping biasgenerationcircuitColor developing DC bias drive signalColor developing AC bias drive signalColor developing bias level control signalColor developing cylinderAC+DC (negative)Download free service manual at http://printer1.blogspot.com
