Ricoh V-C3, Техническое учебное пособие

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V-C3 Training
302
Slide 302
Image Position Correction (MUSIC)
MUSIC Pattern – Main Scan Correction
!
This diagram shows a
close-up view of the main-
scan test pattern.
!
K is the reference, and the
positions of CMY are
adjusted with reference to
the K pattern.
!
The CMY patterns are
vertical (shown in grey in
the diagram), but the K
pattern overlaps the CMY
patterns as shown.
Target
Actual
Sensor Output
#
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 laser timing
in response to the results of this comparison.