Gestetner G060 Service Manual page 538

TROUBLESHOOTING GUIDE
Direction Area Symptom
Main-scan Entire Color shifts on the
image entire image and
amount of shifts is
almost the same at
front, center, and
rear sides.
( pattern 4 on
page 4-45 for the
symptom)
Front or The amount of color
rear shift at the front and
rear sides becomes
gradually bigger
toward the trailing
edge.
G570
Action Required
Possible Cause
Output Mode
Main-scan -
registration is not
correctly
adjusted.
• Side fence
-
position
• Transfer belt
position
4-56
Procedure / Remarks
SP Mode
SP5-993- Measure the gap between the black line and other
010 (Y) colors (YMC) using a magnification scope.
Convert the measured value [µm] to [dots] with the
SP5-993-
following formula. Then, add or subtract the calculated
011 (M)
dot value in the SP mode.
SP5-993-
Correction [dots] = Measured value [µm] / 21.2
012 (C)
If color (YMC) has shifted to the left in relation to black,
add the above value to the current setting.
If color (YMC) has shifted to the right in relation to black,
subtract the above value from the current setting.
Examples
• If the magenta line has shifted to the left by 40µm,
add 4 to the current setting of SP5-993-011
Correction [dots] = +(40/21.2) = Approx. +2
• If the magenta line has shifted to the right by 70µm,
subtract 3 from the current setting of SP5-993-011.
Correction [dots] = -(70/21.2) = Approx. -3
• Check if the side fences of the paper trays are
-
properly positioned. If there is clearance between the
paper and the side fences, this causes paper to skew
during paper transport.
• Check if the transfer belt is in correct position, if the
tension springs are properly set, or if the paper
attraction roller is properly installed..
( 3.7.4 Transfer Belt in the service manual for the
printer mainframe)
Rev. 09/2003
SM