Riso V8000 Series, Technical Manual

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CHAPTER 8. PRINT DRUM SECTION
4. Master Shift Adjustment
Note: Level the machine on the floor before making the adjustment (Ref: Chapter 1, page 1-15)
Make master using Test Mode No.51.
Feed 1,000 sheets of standard A3 white printing paper at print speed No.5, print density at No.3 and print
position at center, and check the master horizontal shift on both the 1st and 2nd print drums, observing
the tail portion of the drum.
Measure the amount of master shifting at the end of the ink opening on the drum screen.
If the master has shifted, adjust by moving the drum positioning block R horizontally.
If the master has shifted to the front, move drum positioning block R to the right.
If it has shifted to the rear, move drum positioning block R to the left.
The adjustment amounts for drum positioning block R are shown below, depending on the amount of
master shift.
If the master has shifted 0.5 mm, move the drum positioning block R horizontally 0.1 mm.
If the master has shifted 1.0 mm, move the drum positioning block R horizontally 0.2 mm.
If the master has shifted 1.5 mm, move the drum positioning block R horizontally 0.3 mm.
If the master has shifted 2.0 mm, move the drum positioning block R horizontally 0.4 mm.
If creases are observed on the top of the screen, above the ink opening holes, move the drum
positioning block R horizontally 0.07 mm.
P08101
P08102
Drum positioning block R
Drum positioning
support plate