Riso RN SERIES Technical Manual - Adjustment

6 – 10

RN (Version 1.0)

CHAPTER 6.   PRESS SECTION

MOUNTING POSITION OF THE PRESSURE LEVER ASS’Y

Adjustment

1.

Mounting Position of the Pressure Lever Ass’y

Checking and adjustment procedure

(1)

Make a confidential master, and then bring the print drum to position A.

(2)

Remove the rear cover.

(3)

Remove the screws and pull forward the filter PCB unit.

(4)

Remove the Second pressure spring, push up the Pressure lever B [A], and disengage it from the

Solenoid lever [D].

(5)

Attach the Second pressure spring and check that the gap between Pressure lever A [B] and

Pressure lever B [A] is between 1.5 mm and 2.0 mm.  (See detailed figure 2.)

(6)

If the gap in step (5) is outside the specifications, remove the Second pressure spring and

loosen the two set screws on Pressure lever B [A].  Insert a 3 mm Allen wrench [C] between

Pressure lever A [B] and Pressure lever B [A] (see detailed figure 1), rotate the Pressure shaft [E]

fully counter-clockwise, and then tighten the set screws on Pressure lever B [A] with the pressure

roller pressing hard against the print drum.  The Pressure lever B [A] should be pushed all the

way back against the machine, when tightening the set screws.

(7)

Check as in step (5), and if the gap is still outside the specifications, repeat step (6).  If the gap is

within the specifications, push Pressure lever B [A] upwards, lock with the Solenoid lever [D], and

attach the Second pressure spring.

Symptoms

• If the gap is too small, the pressure will be too weak, and the printing density may become too light.

• If the gap is too large, there will not be sufficient space between the Pressure roller and the Clamp

plate base on the print drum, and they may touch, damaging the Clamp plate base.

A

B

C

D

E