Ricoh V-C3 Technical Training Manual page 304

Image Position Correction (MUSIC)
MUSIC Pattern – Sub-scan Correction
Slide 304
# The MUSIC sensor response is measured. The output is the lowest when the K
pattern fully overlaps the color pattern (the dotted lines in the diagram cross at
this point). This is the "Actual" position as shown in the diagram. But there is a
"Target" value in the machine's software (an example is shown on the diagram;
this is not the real target, it is just an example to explain the process). The
machine compares the "Actual" and "Target" values, and adjusts the main motor
speed in response to the results of this comparison.
Target
Actual
Sensor Output
304
! This diagram shows
a close-up view of
the sub-scan test
pattern.
! K is the reference,
and the positions of
CMY are adjusted
with reference to the
K pattern.
! The CMY patterns are
at constant intervals,
but the K pattern
overlaps the CMY
patterns as shown.
V-C3 Training