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Image Position Correction (MUSIC)
! Three MUSIC sensors read three MUSIC sensor patterns
that were made with C, M, Y and K toner on the ITB.
! The machine uses the results to adjust:
" Main scan adjustment: The main scan start timing of the
laser beam
» If skew is detected, the positions of the 3rd scanner mirrors for
C, M, and Y are also adjusted
" Sub scan adjustment: The speeds of the drum motors to
correct the intervals between the patterns.
! This adjustment prevents color registration errors.
" What is a color registration error? This is when the four toner
images are not put exactly on top of each other on the ITB.
! The MUSIC adjustment is done for each color (Y, M, C, K).
! MUSIC normally takes about 25 seconds minimum. But it
can take up to 100 seconds if the machine has to do MUSIC
more than one time, if it cannot adjust correctly the first
time.
Slide 294
# MUSIC is "Mirror Unit for Skew and Interval Correction". But other components
are used (temperature sensors, motor speed), so the name is a bit confusing.
What is Done?
294
V-C3 Training
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