COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)B. Controlling the Developing RotaryWhen the DC controller PCB receives the print signal (PRNT*) from the printerboard*1, it generates the developing rotary motor drive signal to turn on the developingrotary motor (M1) so that the developing rotary starts normal rotation.When the DC controller PCB detects that the developing rotary has rotated to a pointof deceleration, it slows down the developing rotary motor. Then, when it detects that thedeveloping rotary has rotated to a stop point, it stops the developing rotary motor to stopthe developing rotary.The speed of rotation and the stop position of the developing rotary are controlled bythe DC controller PCB in reference to the period over which the 8 flags behind the devel-oping rotary move past the developing rotary position sensor (PS3). As many as eightflags are used: home position flag (serving also as the black toner cartridge stop positionflag); color cartridge stop position flag for each color (3 pc.); and deceleration flags (4pc.).The stop position flag (3 pc.) for each color cartridge also serves as the cartridgeremoval deceleration flag.When PS3 detects a flag, the developing rotary position detection signal (DEVHP*)goes ‘1’. The DC controller PCB finds out the home position flag with reference to the timeat which DEVHP* goes ‘1’, and the position of the stop position flag and the decelerationflag with reference to its time counter reading.Figure 4-302CHAPTER 4 IMAGE FORMATION SYSTEM4-12Home position flag(black cartridge)Magenta cartridgedevelopment stop position flag(cyan cartridge removaldeceleration position flag)Cyan cartridge stopposition flag(yellow cartridge removaldeceleration position flag)Yellow cartridge stopposition flag(magenta cartridge)Yellow cartridgedeceleration positionflagCyan cartridge decelerationposition flag Magenta cartridgedeceleration positionflag(black cartridgedeceleration position flag)PS3MYCYellow cartridge removalstop positionMagenta cartridgeremoval stop positionCyan cartridge removalstop positionYellow Cartridge Stop Position (facing against the photo sensitive drum)Download free service manual at http://printer1.blogspot.com
