Xerox ColorQube 9303 Series Service Manual page 1771

Figure 27 Cleaning unit components
Because the oil metering blade must engage and disengage from the drum a narrow oil bar
naturally occurs where disengagement of the oil metering blade occurs. The speed with which
the roll and blade are removed from contact with the drum, as well as the timing of the blade
and roll movement will determine the size and shape of the oil bar. The amount of gel (oil and
ink mixture) in the oil, will also impact the oil bar geometry. If the oil bar is too large, the transfix
roll or stripper blade will pass through the oil bar and potentially become contaminated with oil.
NOTE: As the cleaning unit is removed, the cleaning unit latch is moved to the front to lock the
mechanism in place. The cams are locked in the down position and the cleaning unit can be re-
installed easily.Care should be taken not to run the cams while in diagnostics unless this latch
is unlatched (in and down). CRUM corruption may occur if cleaning unit is removed while writ-
ing. To avoid this, the cleaning unit latch solenoid waits ~2 seconds after opening the front door
interlock before unlocking the cleaning unit.
Cleaning Unit initialization
Figure 28. Cleaning unit presence is determined by attempting to communicate with the
CRUM. If the cleaning unit is present, full cleaning unit travel operation is checked during sys-
tem initialization. During the full travel operation, the cam position required to lift the blade to
the blade engage position is determined by monitoring the cleaning unit lift motor following
error. The position where the oil metering blade makes contact with the drum will also be deter-
mined based on a spike in either the motor drive voltage of the drum (as it is spinning) and/or a
spike in the motor drive voltage while lifting the cleaning unit. A cleaning unit operation is per-
formed at the end of mechanical initialization.
Figure 28 Cleaning unit unitization
Principles of Operation
February 2013
ColorQube® 9303 Family 8-77