Image Position Correction (Music); What Does Music Do?; When Is Music Done? - Toshiba e-STUDIO4500c Service Manual

August, 2006

6.7.4 IMAGE POSITION CORRECTION (MUSIC)

What does MUSIC do?

MUSIC is the Mirror Unit for Skew and Interval Correction. Three MUSIC sensors
above the ITB read three MUSIC sensor patterns made by the machine on the ITB.
The machine uses the results to adjust:
The machine adjusts the start timing for the laser at the start of the main scan.
This adjusts the main scan. If skew is detected in the main scan direction, the
machine adjusts the angles of the 3rd mirrors (C, M, and Y only).
The speed of the drum motors to correct the intervals between the patterns. This
adjusts the sub scan.
If the vertical alignment of the patterns is not correct, or if the intervals are not
correct, this causes color registration errors.
The MUSIC adjustment is done for each color (Y, M, C and K).

When is MUSIC done?

Normally, MUSIC executes automatically:
Immediately after the machine is turned on or returns from an energy save mode.
At the start of a job, if the temperature in the laser exposure unit changed since
the end of the job by the amount set with SP2153 012 (Default: 1.5 ºC)
If the cover is open for longer than the time set with SP2153 015 (Default: 8 min.)
After process control (enable/disable with SP2153 002).
Every 100 pages during a long color job (you can change the interval with
SP2153 010) if the temperature in the laser exposure unit has changed since the
end of the most recent MUSIC adjustment by the amount set with SP2153 012
o
(Default: 1.5 C)
Forced MUSIC (manually by the user or a technician)
User Tools – Maintenance – Color Registration
SP 2111 001
Important
Immediately after the machine is turned on, MUSIC requires time to complete
processing. But you can do a black-and-white job immediately.
If a job is started before the MUSIC process has completed, a message ("Now
Self Checking") will appear on the operation panel display.
The job will not be done until the MUSIC process is finished. Wait for MUSIC to
complete.
NOTE: MUSIC: Mirror Unit Skew Interval Correction
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LASER UNIT