Xerox DocuColor 12/DCCS50 User Manual

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DocuColor 12/DCCS50
DADF System Control, DADF Document Transport
Principles of Operation
Reissue
Figure 2 DADF Simplified Control Communications Path
The DADF Control PWBA includes several LEDs to rapidly determine the status of selected
signals. Ta b
le 1 lists these LEDs.
DADF and IIT Interaction
The DADF detects the size of each original document while the document is fed from the input
tray onto the platen glass. The Fast Scan or Y dimension is determined by two size sensors
just before the Registration Roll in the paper feed path. The Slow Scan or X dimension is deter-
mined by measuring the length of time that Registration Sensor is blocked for a known trans-
port speed.
These dimensions are passed from t
he
DADF Control PWBA to the Pre-IPS PWBA using their
serial communications link. The Pre-IPS PWBA compares these values with the contents of a
lookup table in its NVM. This measurement technique reduces the delay between the docu-
ment’s arrival on the platen glass and the start of document scanning.
DADF Document Transport
The DADF feeds the documents in the Input Tray Assembly from the top of the stack. For sin-
gle-sided document copying, the fo
llowing process is used:
1. The document is transported from the Input T
ray onto the Platen Glass.
2. The downward facing side of the document is scanned.
3. The document is transported to the Output Tray
For two-sided copying, additional steps are required.
1. The document is transported from the I
nput T
ray onto the Platen Glass.
2. Side one is scanned
3. The document is transported through an inverter paper path within the DADF and back to
the
Platen Glass for copying the second side.
4. Side two is scanned
5. When selected by the user, the document may
again be sent through the inverter and
again placed on the Platen Glass. This preserves the original order of the documents.
6. The document is transported to the Output Tray.
To load the Input Tray, the user positions the document by
placing its left side against the raised
Entrance Gate. The back edge of the document is placed against the Back Guide of the Input
Tray.
The DADF can automatically feed up to 40 copies/
minut
e (A4 or 8.5x11 LEF) onto the Platen
Glass for copying.
The Input Tray capacity is:
• 50 sheets of 38-100 gsm (10-24 lb.)
• 40 sheet of 101-128 gsm (24-30 lb.)
The document weight range for duplex copying from the DADF
is 50 - 110 gsm (13-28 lb.). This
is because the DADF has a sharp turn in the inverter paper path.
Document Feeding Components
Figure 1 shows the document transport components of the DADF. Figure 2 shows the locations
of the sensors.
Table 1 DADF Control PWBA LEDs
LED Color Signal Comment
CR2 Green RXD Flickering indicated serial data from Pre-IPS
PWB
A
CR3 /Re
set Lit when DADF Control PWBA CPU is being
reset
CR
4 +5 VDC Lit when +5 VDC present
CR5 +24 VDC Lit when +24 VDC present

Xerox DocuColor 12/DCCS50 Specifications

General

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