Gestetner B147 Service Manual page 276

TROUBLESHOOTING GUIDE
Direction Area Symptom
Main-scan Entire Color shifts on the
image entire image, and
the amount of shift
differs at front,
center, and rear.
(Refer to pattern 3
on page 4-45 for the
symptom.)
SM
Action Required
Possible Cause
Output Mode
Main-scan -
magnification is
not correctly
adjusted.
4-74
Procedure / Remarks
SP Mode
SP5-993- Measure the gap between the black line and other
013 (Y) colors (YMC) using a magnification scope.
Convert the measured value [mm] to [%] with the
SP5-993-
following formula. Then, add or subtract the calculated
014 (M)
value in the SP mode
SP5-993-
Correction [%] = Measured value [mm] / 287 x 10000
015 (C)
If the color line is enlarged in relation to black, add the
correction value to the current setting.
If the color line is reduced in relation to black, subtract
the correction value from the current setting.
NOTE: Line position adjustment (SP5-993-002 or 'Auto
Adjust' in User Program mode) should be done to check
the result after changing the main-scan magnification
data. This is because the changes will affect the line
position adjustment.
Examples
• If the magenta line is enlarged by 0.1mm in relation to
the black line, add "4" to the current setting of SP5-
993-014.
Correction [%] = (0.1/287) x 10000 = Approx. +4
• If the magenta line is reduced by 0.05 mm in relation
to the black line, subtract "2" from the current setting
of SP5-993-014.
Correction [%] = -(0.05/287) x 10000 = Approx. -2
B147/B149/B190