Controlling The Developing Rotary - Canon CP660 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM
B.

Controlling the Developing Rotary

When the DC controller PCB receives the print signal (PRNT*) from the printer
1
board* , it generates the developing rotary motor drive signal to turn on the developing
rotary motor (M1) so that the developing rotary starts normal rotation.
When the DC controller PCB detects that the developing rotary has rotated to a point
of deceleration, it slows down the developing rotary motor. Then, when it detects that the
developing rotary has rotated to a stop point, it stops the developing rotary motor to stop
the developing rotary.
The speed of rotation and the stop position of the developing rotary are controlled by
the 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 eight
flags are used: home position flag (serving also as the black toner cartridge stop position
flag); color cartridge stop position flag for each color (3 pc.); and deceleration flags (4
pc.).
The stop position flag (3 pc.) for each color cartridge also serves as the cartridge
removal 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 time
at which DEVHP* goes '1', and the position of the stop position flag and the deceleration
flag with reference to its time counter reading.
Cyan cartridge deceleration
position flag
Cyan cartridge stop
position flag
(yellow cartridge removal
deceleration position flag)
(black cartridge
deceleration position flag)
Yellow Cartridge Stop Position (facing against the photo sensitive drum)
4-12
COPYRIGHT © 1999 CANON INC.
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Y
M
C
Home position flag
Yellow cartridge
(black cartridge)
deceleration position
Figure 4-302
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Magenta cartridge
development stop position flag
(cyan cartridge removal
deceleration position flag)
Magenta cartridge
deceleration position
flag
Yellow cartridge stop
position flag
PS3
(magenta cartridge)
flag