The primary transfer roller engagement and disengagement control engages the ITB with the
photosensitive drum, or disengages the ITB from the drum, depending on the requirements of the print
job.
●
All rollers disengaged: The ITB disengages from all four photosensitive drums. This is the state
during a standby period, and is also the home position for the primary transfer rollers.
●
All rollers engaged: The ITB engages with all four photosensitive drums. This is the state for full-
color jobs.
●
Only black roller engaged: The ITB engages with only the black photosensitive drum. This is
the state for the black-only print jobs.
The operational sequence of the primary transfer roller engagement and disengagement control is as
follows:
1. The fuser motor drives the primary transfer disengagement solenoid to rotate the primary transfer
disengagement cam.
2. As the cam rotates, the YMC slide plate or the Bk slide plate moves right or left. This causes the
primary transfer roller to move up or down.
3. The ITB engages with or disengages from the photosensitive drum depending on the movement of
the primary transfer rollers.
The DC controller determines that an abnormal primary transfer roller disengagement error has
occurred and notifies the formatter. This error happens when the DC controller does not detect a
specified signal from the primary transfer disengagement switch, even though the primary transfer
disengagement solenoid is driven.
ITB unit presence detection
The DC controller detects the ITB unit presence by monitoring the primary transfer disengagement
switch. The DC controller drives the primary transfer disengagement solenoid for specified times during
the initial rotation period of the following:
●
The product is turned on.
●
The product exits Sleep Mode.
●
The door is closed.
The DC controller determines an ITB unit absence and notifies the formatter when it does not detect a
specified signal from the primary transfer disengagement switch.
ITB life detection
The DC controller detects if the ITB assembly is near the end of its useful life.
The DC controller detects a new ITB assembly when the formatter notifies the DC controller that the
assembly was replaced.
ENWW
Image-formation system
39
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