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NOTE
The accumulated rotation time of the drum motor can be cleared by the formatter.
Remember to reset the transfer unit life expectancy value (accumulated rotation time of the
drum motor) using the control panel when replacing the ITB unit.
ITB self-aligning mechanism
This printer automatically aligns the position of the ITB to prevent tearing of the belt due to
its misalignment.
The alignment rollers, alignment gear, and alignment arm inside the ITB unit move the ITB
feed roller back and forth to align the belt (see the figure below) as described by the
following steps.
1. The ITB has a rib on the back along the left edge of the belt. Inside the ITB unit, two
alignment rollers are positioned at both sides of the rib so that the rib (ITB) will rotate the
roller if it is in contact with one of the rollers. If the ITB is drawn leftward or rightward
during rotation, the rib will touch one of the alignment rollers and turns the roller. (If the
ITB is drawn rightward, the right roller turns, and if it is drawn leftward, the left roller
turns.)
2. The rotation of the alignment roller turns the alignment gear.
3. The rotation of the alignment gear moves the alignment arm.
4. Being interlocked with the arm, the ITB feed roller moves frontward or backward as the
alignment arm moves.
5. The force to feed ITB on each side varies as the ITB feed roller moves back and forth.
This brings the ITB back to the original position before it has been drawn left or right and
the misalignment of the ITB is corrected.
170 Chapter 5 Theory of operation ENWW