118 Theory of operation C7085-90921
Toner carousel
The toner carousel holds the printer’s four toner cartridges: K (black), M (magenta), C (cyan), and
Y (yellow).
The carousel motor (M3) rotates the carousel, and the toner cartridge motor (M5) provides the
drive for the positioning cam and the developer sleeve.
The carousel contains three sensors: developing carousel position sensor (PS10), toner cartridge
contact/separation sensor (PS11), and the toner level sensor (PS12). These sensors, as well as
the detailed operation of the carousel assembly, are discussed on the following pages.
Figure 5-20 Toner carousel assembly
Operation
The DC controller activates the carousel motor (M3) and rotates the carousel. As the carousel
rotates, the position sensor (PS10) monitors the carousel for the stop position flags. Each stop
position flag is used as a development and toner cartridge removal flag (see Figure 5-21). When a
flag is detected, the DC controller monitors the time it takes the flag to pass the sensor (PS10).
Each flag is a different width and therefore takes various times to pass the sensor. This time lapse
is used by the DC controller to determine which development/removal stop position flag has
passed the sensor. When the carousel turns to the correct position, the DC controller stops the
carousel motor (M3) and the carousel from rotating any farther.
Table 5-1 Toner carousel assembly components
Reference Description
M5 Toner cartridge motor
M3 Carousel motor
PS10 Carousel position sensor
PS11 Toner cartridge contact/separation sensor
PS12 Toner level sensor
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