1/05
10-115
DocuColor 12/DCCS50
Development
Principles of Operation
Reissue
Developer Rotary Position
The Developer Rotary Assembly has a “home position” that it always returns to at the start of
any print job. T
he home position for the Rotary Assembly places the development point with
the Photoreceptor Drum between the Black and Cyan Developer Housing Assemblies. (Black
is 45° before the development point and Cyan is 45° past the development point). This allows
the Machine Run Control to have a consistent reference point to move the correct color into a
development point for each image pass on the Photoreceptor Drum. A flag mounted on the out-
side of the Rotary Assembly end frame is det
ect
ed by the Rotary Home Position Sensor.
The Rotary Assembly rotates only in a clockwise direction when viewed from the front of the
machin
e. The Rotary Assembly moves a color Developer Housing Assembly into the develop-
ment point with the clockwise rotating Photorec
eptor
Drum. When in the development point,
the Developer Roll begins to rotate counter clockwise and receives the bias charge. This bias
charge causes the toner leave the rotating Developer Roll, developing the latent image on the
Photoreceptor Drum. The carrier beads are mostly held onto by the magnetic polarity of the
Developer Roll.
One color at a time is transferred to the Photoreceptor Drum and then to the IBT before the
next
c
olor is used to develop the latent image on the Photoreceptor Drum. The order that the
color moves into the development point with the Photoreceptor Drum is:
1. Yellow (Y)
2. Magenta (M)
3. Cyan (C)
4. Black (K)
Black will always be the last color to be transferred to the Photoreceptor Drum (and also laid
onto t
he IBT) for a copy job. This order is required so that Black will be the first layer placed
onto the final copy material when transferred from the IBT to the copy material.
When a certain color is not used for a color copying job,
th
e Developer Housing for that color is
still moved into the development point with the Photoreceptor Drum. No development occurs
because the Laser does not mark a latent image on the Drum and no charge is applied to the
Developer Roll in the Developer Housing. The exception to this Rotary Assembly rotation
sequences is for black only copies. For this type of job, The Rotary Assembly does not stop at
any of the other colors (Y, M, C). See Ta b le 1 for the Developer Rotary sequences and refer to
Developer Bias and Power Supply for more information on the charging the Development Roll.
The steps for the Rotary Developer Assembly for Color Copying are as follows:
1. When the Copy process is started, the Developer Rot
ary A
ssembly rotates and resets to
Home Position. (Home Position = Development Point between Black and Cyan Developer
Housings.)
2. The Rotary Motor is switched off and the elect
ric lock
of the Rotary Developer Assembly
is released.
3. Developer Rotary Assembly rotates clockwise 135° (900 step
s) to bring the Yellow Devel-
oper Housing to the Development Point.
• 99 steps before the Developer Housing reaches the Development Point, the Devel-
opment Bias is energized.
• 53 steps before the Developer Housing reaches the Development Point, the Devel-
oper Clutch is deenergized and the Main Motor drives the Developer Roll in the
Developer
Housi
ng.
4. Rotary Stepper Motor electronically locks the Developer Housing at
the Development
Point. The latent image on the Photoreceptor Drum is then developed.
• If any color is not used in the image, the ROS
does not write to the Photoreceptor
Drum and no Development Bias is applied to the Developer Roll in the Developer
Housing for that particular color.
5. When the Yellow development is completed, the Development Clutch is energized and the
Rot
ary Mot
or is electronically released.
6. The Rotary Motor rotates the Developer Rotary Assembly clockwise 90° to the Magent
a
Developer Housing. Steps 3 - 5 is implemented for Magenta, Cyan and Black colors.
7. When Black Developing is completed, the Developer Rotary Assembly resets to Home
Posit
ion.
The steps for the Rotary Developer Assembly for B/W Copying are as follows:
1. When the Copy process is started, the Developer Rotary Assembly rotates and resets to
Home Positi
on. (Home Position = Development Point between Black and Cyan Developer
Housings.)
2. The Rotary Motor is switched off and the electric lock of the Developer Rotor is released.
3. Developer Rotary Assembly rotates clockwise 45° (300 steps) t
o bring the Black Devel-
oper Housing to the Development Point.
• 99 steps before the Developer Housing reaches the Development Point, the Devel-
opment Bias is energized.
• 53 steps before the Developer Housing reaches the Development Point, the Devel-
oper Clutch is deenergized and the Main Motor drives the MAG Roll in the Developer
Housing.
4. When the Black Developer Housing reaches t
he Development
Point, the Rotary Latch
(self-holding) Solenoid is energized to lock the Rotary Assembly in place and the latent
image on the Photoreceptor Drum is developed.
5. When the Black development is completed, the Rotary Latch (self-holding) Solenoid is
energized
to
unlock the Rotary Assembly.
6. The Developer Rotary Assembly resets to Home Position.
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