Ricoh M C250FW, Field Service Manual

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7.Detailed Descriptions
270
Three TM/P sensors monitor color offset in the main scan and sub scan directions at each point [A]
(left), [B] (center), and [C] (right). They measure and calculate the amount main scan shift and
magnification errors, as well as sub scan shift skew and bending.
The center TM/P sensor is also used to detect the amount of toner coverage in the patterns on the
drum for toner coverage process control.
Process Control Timing and Triggers
The table below describes toner coverage control and the events that trigger MUSIC execution.
Process Control
Timing
Process Control Triggers Control Action
At power ON AIO replacement detected Toner coverage control,
and MUSIC execute
Count reset done after replacement of ITB unit Toner coverage control,
and MUSIC execute
When changes in ambient conditions are detected *1 Toner coverage control,
and MUSIC execute
Other than above MUSIC executes
Recovery from
Sleep Mode
AIO replacement detected Toner coverage control,
and MUSIC execute
Count reset done after replacement of ITB unit Toner coverage control,
and MUSIC execute
When changes in ambient conditions are detected *1 Toner coverage control,
and MUSIC execute
Other than above No action