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Figure 2 DADF Simplified Control Communications Path
The DADF Control PWBA includes several LEDs to rapidly determine the status of selected
signals.
Table 1
lists these LEDs.
Table 1 DADF Control PWBA LEDs
LED
Color
Signal
CR2
Green
RXD
CR3
/Reset
CR4
+5 VDC
CR5
+24 VDC
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 the 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.
Reissue
DocuColor 12/DCCS50
Comment
Flickering indicated serial data from Pre-IPS
PWBA
Lit when DADF Control PWBA CPU is being
reset
Lit when +5 VDC present
Lit when +24 VDC present
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 following process is used:
1.
The document is transported from the Input Tray 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 Input Tray 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/minute (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.
of the sensors.
1/05
DADF System Control, DADF Document Transport
10-59
Figure 2
shows the locations
Principles of Operation
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Troubleshooting
