Xerox DocuColor 12/DCCS50 User Manual

1/05
10-78
DocuColor 12/DCCS50
Image Sensing (Digital Copier & Copier/Printer Con-
Reissue
Principles of Operation
Carriage Speed Control
The Carriage Motor is driven at different speeds depending on the task being performed. In
addition,
while scanning, the Carriage Motor speed depends on the selected magnification set-
ting. Both the Full-Rate Carriage and the Half-Rate Carriage must be driven at faster speeds
as t
he magnifi
cation ratios are reduced. Selected values are shown in Table 2. The forward
scanning speed equals 225 mm/sec. divided by the magnification expressed in decimal form.
Scan Length Control
The Carriage Motor emits a pulse every 0.72 degrees of rotation (500 pulses per one complete
revolut
ion).
This corresponds to 0.0761565 mm of linear travel by the Full-Rate Carriage.
These pulses are routed to the Pre-IPS PWBA. Carriage position is determined by keeping
track of the total number of pulses which have occurred in each direction since the last transi-
tion of the REG1 Sensor.
Carriage Overrun
Unlike some machine designs, this machine includes
no over
-limit sensors in either the forward
or reverse directions. Instead, the current position of the carriages is calculated based on the
REG1 Sensor transitions and Carriage Motor pulses.
Initialization Carriage Motions
Upon equipment power up or when returning from low power state, the Full-Rate Carriage
(FRC) moves to its Home Position. This is 30 mm to the right of the Registration Position. The
sequence of motions to get there depends entirely on where the FRC was initially. The initial
position can be accurately determined by the state of the REG1 Sensor. An On state indicates
the FRC is left of the Registration Position, and an Off state indicates that the FRC is right of
the Registration Position. If the FRC started left of the Registration Position, it does the follow-
ing:
1. It moves rightward to a position 20 mm right of the Registration Position
2. It waits 30 msec
3. It moves leftward to a position 20 mm left of the Registration Position
4. It waits 30 msec
5. It moves rightward to the Home Position.
If the FRC started to the right of the Registration Position, it does the following:
1. It moves leftward to a position 20 mm left of the Registration Position.
2. It waits 30 msec.
3. It moves rightward to the Home Position.
Post-Initialization AGC/AOC/Shading Operations and Carriage Motions
(No DADF)
If the machine includes a Platen Cover and no DADF, the following events occur during initial
calibrations:
1. The FRC moves from the Home Position to the White Reference Position, which is 20 mm
to t
he left of Registration Position.
2. The Xenon Lamp is lit for 2 seconds.
3. AGC readings are taken.
4. The Xenon Lamp is shut off.
5. AOC readings are taken.
6. The Lamp is lit for 2 seconds
7. The first of two readings for Shading Correction is taken.
8. The FRC moves rightward 2 mm and takes the second Shading Correcting reading.
9. The FRC moves leftward 2 mm and takes a White Variation Correction reading. This
value i
s
stored in the NVM.
10. The Xenon Lamp is shut off and the FRC goes back to the Home Position.
Post-Initialization AGC/AOC/Shading Operations and Carriage Motions
(With DADF)
If the machine includes a DADF, the following events occur during initial calibrations:
1. The FRC moves from the Home Position to the White Reference Position., which is 62
mm to
the left of the Registration Position.
2. The Xenon Lamp is lit for 2 seconds.
3. AGC readings are taken.
4. The Xenon Lamp is shut off.
5. AOC readings are taken.
6. The Lamp is lit for 2 seconds
7. The first of two readings for Shading Correction is taken.
8. The FRC moves rightward 2 mm and takes the second Shading Correction reading.
9. The FRC moves rightward 5 mm and a second White Variation Correction reading is
ta
ke
n.
10. The FRC moves rightward 40 mm to a location 20 mm to the left of the True Registration
Posit
ion. The first White Variation Correction reading is taken.
11. The Xenon Lamp is shut off and the FRC goes back to the Home Position.
Document Scanning Carriage Motions (Manual Document Positioning)
These events are performed whenever the user places a document on the platen manually.
They occur regardless of whether a DADF is installed. However, the physical locations of the
White Reference Positions and Start Scan Positions differ between units with or without a
DADF. These are shown in Figure 8 and Figure 9. In both cases, however, the events are as
follows:
1. The user opens the platen cover and places a document original on the platen.
Table 2 Full-Rate Carriage Speeds
Mode of Operation Full-Rate Carriage Speed
Initialization 112.5 mm/sec or 225 mm/sec
Scanning Forward, 400% magnification 56.25 mm/sec
Scanning Forward, 100% magnification 225 mm/sec
Scanning Forward, 25% magnification 900 mm/sec
Scanning Return, all magnifications 675 mm/sec or 927 mm/sec
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Xerox DocuColor 12/DCCS50 Specifications

General

Brand	Xerox
Model	DocuColor 12/DCCS50
Category	All in One Printer
Language	English