Curing Scratching Problems

Reason for scratches/problem

Cure

Pale lines/pressure marks

Plates:

• check plates from different batches and compare pressure marks.

Processor:

• Ensure that the developer is standard and fresh;

• Try different temperatures;

• Try decreased speed;

• Try increasing replenishment.

Lotem:

• Load/unload rollers springs press to hard on the plate; Readjust piston speed or try replacing the springs with thinner ones (P/N 510F27282)

Wheels of plate supports
(along punch beam)

Clean or replace wheels, make sure wheels are rolling freely with no excess friction (The whole support P/N is 507A20414)

Cassette is too high relative to machine, therefore cassette rollers press hard on the plate

Readjust machine height to the maximum possible

Cassette rollers are stuck or not rolling freely

Clean and remove residues of silicon rubber that may be around roller

Cassette rollers not smooth

Replace damaged rollers (P/N 290E9L765)

Cassette rollers still scratching the plate

Replace hard rollers with soft ones- P/N # 290A2U472 (x 35 rollers)

Plate is being dragged/pressed to hard against disposal rollers during X motion

Raise Y during X motion over the disposal rollers; Relevant parameters: Loading System/Loading System Setup/

“Y_Extra_To_Detector “
“Y Enter to_Punch  for 0.2”
“Y_In_Punch”        

Loading System/Load Plate/From Cassette to Punch Stage/

“Y Up After_Cantring”
“Y Down After Punch”

Disposal rollers still scratching the plate

Replace hard rollers with soft ones- P/N # 290A2S981(x75 rollers)

Protruding tie-wraps along punch beam scratch the plate

Remove protruding tie-wrap and replace with new one, making sure the connection and tip are facing sideways and not upwards

Dots/pinholes appear on the plate, lined in constant intervals along drum circumference axis 

Usually caused by the upper or lower load rollers. Remove assembly and check rollers and their springs (P/N 290A4L268),Roller (P/N290F2M754+290F2M755)(whole assembly: Upper roller Assy P/N 510P51270, Lower roller Assy P/N 510P51271)

Rollers beneath gripper actuators beam not rolling free

Check rollers for free rotation, remove to clean if necessary

Plate leader rollers (under the drum)Are stuck/not clean/not smooth

Clean rollers or replace whole assembly if necessary (P/N 510P1P590, for VL P/N 510K1P260)

Plate leader hinges are protruding beyond rollers radius and touch the plate (Some were badly manufactured)

Replace the whole assembly with new P/N 510P1P590 (for VL P/N 510K1P260)