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CZ180 / CV1860 Rev. 1.0
CHAPTER 12: MASTER MAKING SECTION
4. Master Cut Length Adjustment
1) The normal length of the master is 461mm plus or minus 7mm.
Depending on the Drum and the amount of master under the clamp, the length of white margin at
the tail of the master on the drum differs.
2) If the white margin at the tail of the master on the Drum is too small and if that is causing the ink
to seep out during the printing, the total master length needs to be increased.
3) On the other hand, if the white margin of the master at the tail of the Drum is too much, the tail
end of the master will touch the Master removal unit and gets the ink transferred, causing the ink
to land on the print papers. If this is happening, the total length of the master needs to be made
shorter.
4) Use Test Mode No. 0544 [Master Cut Length Adjustment] to make an adjustment.
Adjustable range: -200 to +200 (1 = 0.1mm)
+ value makes the total length of the master longer.
5. Master Making Image Elongation and Shrinkage
1) Use Test Mode No.0081 to make master and prints.
2) Check the master making elongation or shrinkage by measuring from the top horizontal line
to the 32nd horizontal line from the top (length of 31 blocks) should be 336mm plus or minus
1%(3.36mm).
3) If the measured distance is out of the range, use Test Mode No.0547 [Write Pulse Motor Speed
Adjustment] to make an adjustment.
Adjustable range: -100 to +100 (1 = 0.1%)
+ value speeds up the Write pulse motor and elongates the image.
As an example, for a measured length of 334mm, which is 2mm short of the target length,
increasing the value by +6 (0.6%) will correct the shrank image to approx. 336mm.
6. Master Making Length Adjustment
1) Use Test Mode No.0080 to make a master.
2) Peel off the master from the Drum and measure the distance from the leading edge of the top
image to the tail edge of the last image on the master.
3) The distance should be 357mm.
4) If the measured length is out of the range, use Test Mode No.0542 [Master Making Length
Adjustment] and make an adjustment.
Adjustable range: -100 to +100 (1 = 0.1mm)
+ value increases the master making length.
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