Apple Self Repair Guides

Toner Carousel Control Outline

The toner carousel consists of four cylindrical bays clustered around a central press assembly. Each bay is occupied by a single cartridge.

Fetch When you load a cartridge into the printer, that color is said to be in a

"fetch" position. As the cartridge clicks into place, nine separate pins engage. These pins assure a solid coupling that is critical to the mechanical functionality of the printer. See "Toner Cartridge Installation" for more information.

Note: The "home" position of the carousel is the same as the magenta "fetch" position. This is the position of the carousel during standby.

Stop During printing or startup, the carousel rotates counterclockwise to bring the cartridge to a position facing the photosensitive drum. This is known as the "stop" position. From the fetch to the stop positions, the cartridge housing revolves approximately 135 degrees relative to the inner workings of the cartridge. Therefore, the developing cylinder is fully exposed at the stop position. It has not yet meshed with a drive train. See "Toner Cartridge Stop" in the "Carousel Rotation" section for more information.

Press The cartridge press assembly at the center of the carousel keeps its position relative to the chassis and does not rotate with the carousel.

The moment the cartridge reaches a stop position, the press assembly shifts it laterally and presses its developing cylinder against the photosensitive drum. This is known as the "press" position and is the only stage in which the inner workings of the cartridge are mechanically driven. Press occurs first for magenta, followed in order by cyan, yellow, and black.

See "Toner Cartridge Press" in the "Carousel Rotation" for more information.

Mechanical drive is delivered to the toner carousel in three phases: the rotation of the toner carousel itself, the press and separation of the toner cartridge, and the rotation of the developing cylinder. This sequencing is accomplished by varying the rotational direction of the toner carousel motor and the switching of the toner carousel drive clutch (CL2). The three phases are delivered from three separate points on the printer drive assembly.

^—^—^—^^	Toner Carousel Motor	Toner Carousel Clutch (CL2)
Carousel Rotation	Normal	On
Toner Cartridge Press/Separation	Reverse	Off
Developing Cylinder Rotation	Normal	Off

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