Print Density Adjustment; Master Elongation Adjustment - Riso V8000 Series Technical Manual

CHAPTER 8. PRINT DRUM SECTION
2.

Print Density Adjustment

Adjustment Procedure
(1) Run Test mode No. 684 (Print pressure home position adjustment).
(2) If print density is too low, increment the value already input in the test mode.
If the print density is too high, decrement the value already input.
When the value is changed, value changed in amount of 3 is almost equivalent to one step
change on the print density adjustment key on the operation panel.
(3) After adjusting, check the print density by the check procedure given below.
Checking Procedure
Test chart No. 11, print speed: 3, print density: 1, and standard A3 size white printing paper.
3.

Master Elongation Adjustment

Note: Level the machine on the floor before making the adjustment
Check and Adjustment Procedure
(1) Make master using Test Mode No.51.
(2) Feed 1,000 sheets of standard A3 size white printing paper at print speed No.5, print density at
No.3 and print position at center, and check that the master on the print drum elongation is 0 to
0.5 mm for both the 1st and 2nd print drums.
(3) If the elongation is not within the specifications, adjust the Teflon tape thickness around the print
drum Flanges as shown below, depending on the master elongation.
The Teflon tape thickness around the print drum Flanges should be made identical between the
two Flanges, (F) & (R), on each print drum.
Reduce the Teflon tape thickness if the master elongates downwards on the print drum.
Increase the Teflon tape thickness if the master elongates upwards on the print drum.
If master elongation is 1.0 mm, change the tape thickness by 0.08 mm.
If master elongation is 1.5 mm, change the tape thickness by 0.13 mm.
If master elongation is 2.0 mm, change the tape thickness by 0.18 mm.
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(Ref: Chapter 1, page 1-15)