Canon CLBR 460ps Service Manual page 109

b. Developing rotary control
When it receives a PRINT signal (/PRNT) from the video controller, the DC controller outputs a
DEVELOPING ROTARY MOTOR DRIVE signals, turns the developing rotary motor (M3) ON, and
rotates the developing rotary.
When the developing rotary turns to the prescribed position, the DC controller stops the
developing rotary motor and stops the developing rotary.
The developing rotary stop position is controlled by monitoring the time in which the stop
position flags with various width pass through the developing rotary position sensor (PS10).
There are four stop position flags for toner cartridges. Each flag is used as development and
removal stop position flag.
When PS10 detects a flag, the DEVELOPING ROTARY POSITION DETECTION signal
(/ROTHP) goes "L". The DC controller determines which development/removal stop position flag
is detected from the time in which /ROTHP is "L".
M cartridge development
stop position flag
Bk cartridge removal stop
position flag
PS10
Bk cartridge development
stop position flag
Y cartridge removal stop
position flag
< Example of Bk cartridge development stop position (facing the photosensitive drum) >
If PS10 detects one of the following phenomena, the DC controller determines that the develop-
ing rotary has failed. The DC controller stops the printer and notifies the video controller of the
developing rotary failure.
1) The developing rotary motor runs for the prescribed period of time, but PS10 does not detect
the stop position flag.
2) PS10 detects abnormal stop position flag width.
3) PS10 detects a flag width that is different from that of the specified stop position flag.
Y
Bk
C
M
Figure 2-4-7
CHAPTER 2
C cartridge development
stop position flag
M cartridge removal stop
position flag
Y cartridge development
stop position flag
C cartridge removal stop
position flag
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