Xerox DocuColor 12/DCCS50, Service Manual

Page: 1525 / 1617

1/05
10-105 DocuColor 12/DCCS50
Tray 5
Principles of Operation
Reissue
As the paper advances through Tray 5 Take Away Rolls, the lead edge of the paper passes a
reflective sensor. The signal from this sensor is compared to the TR0 signal from the IBT by the
machine run control. The machine run control signals Tray 5 Motor to run the Take Away Rolls
faster or slower so that the paper will synchronize with the IBT for proper image transfer.
The same alignment procedure occurs when the paper comes from the Vertical Transport and
Paper Tray direction. In this case, a Preregistration Sensor signals the machine run control
which has the Tray 5 Motor vary the speed of the Preregistration Rolls. Refer to
Figure 1 for
Tray 5 Motor speed adjustments of these rollers. From either Tray 5 Take Away Rolls or the
Preregistration Rolls, the copy is advanced to the Registration Rolls for “deskewing”. (See
Paper Registration and Paper Transport to the IBT Belt .)
Figure 1 Motor Speed Adjustments for Paper and Image Alignment
Tray 5 Mechanical Drives
Tray 5 uses two motors:
• Tray 5 Motor drives Tray 5 Nudger roll, Tray 5 Feed Roll, Tray 5 Take Away Rolls, Pre-
Registration Rolls and Take Away Rolls #1.
• Tray 5 Lifter Motor raises or lowers the Paper Lifter to control the paper level for correct
feed height in Tray 5.
- Clockwise raises the Paper Lifter
- Counter clockwise lowers the Paper Lifter
Figure 2 Tray 5 components
Tray 5 Copy Size Sensing
When paper is placed in Tray 5, a paper Size Guide is manually adjusted to accommodate the
lead edge dimension of the copy. The Size Guide uses a variable resistor sensor (0-5 VDC) for
providing the lead edge dimension to the machine run control. The length of the paper (run
dimension) is determined by the activation time of the Pre Fuser Sensor.
Figure 3 Tray 5 Drive and Size Sensor
SIZE
GUIDE
PAPER TRAY
LIFT
FEED OUT
SENSOR
NUDGER ROLL
SOLENOID
RETARD ROLL
FEED ROLL
PAPER OUT
SENSOR
PAPER LEVEL SENSOR
Tray 5 Motor
Nudger Roll
Tray 5 Take Away Roll
Paper Size Sensor