Product

• Lotem^® 800 II
• Lotem 800 Quantum
• Lotem Quantum Spectrum

Background

• The start line of some jobs shifts around the drum at approximately 100 microns from the gripper. Occurs mostly at the end of the plate - 80-95%
• Shift varies from a few millimeters to 0.5 mm wide.
• Exposure lines shift down by a few millimeters.
• Alternate swaths shift, meaning the first swath shifts, but the proceeding swath does not.
• Black hairline appears on border of every shift, indicating a carriage jump of approximately 10 microns.
  
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The existing V-block pin is inserted into a hole on the carriage beam. The pin is shorter in length than the depth of the hole. Over a protracted period of time, the V-block pin can recede too far into the hole:



When this occurs, there is nothing to impede the carriage beam from moving up and down. To prevent this from happening in the future, a new, longer V-block pin was designed.

Requirements

• Longer V-block pin (p/n 312-00003)
• Support Cover (p/n 290B4L148A)
• Extractor jig (Contact CIL Product Support Group)
• Loctite 638

Procedure

This procedure describes how to replace the existing V-block pin with a new, longer pin.

1. In Lotem Controller, open the rear door of the platesetter.
2. Remove the rear upper and lower panels.
3. Remove the left hand side pin support by removing the two screws that secure it to the beam. The screws are located on the underside of the support:
   
   
   
4. Put the support and the springs to one side, they will need to be reinstalled at the end of the procedure.
5. Dispose of the support cover.
6. Slide the spacer jig over the V-block pin. The jig ensures that no damages is caused to the beam when the V-block pin is extracted:
   
   
   
   
7. Slide the extractor jig over the V-block pin. Secure the jig to the pin by tightening the M6 screw:
   
   
   
   
8. Gradually tighten the two screws on the extractor jig. As the screws are tightened, the V-block pin will slowly be extracted from the beam:
   
   
   
   Continue tightening the screws until the V-block pin can be removed.
9. Loosen the M6 screw on the jig and dispose of the V-block pin.
10. Remove the spacer jig.
11. Clean both the vacated hole on the beam and the new V-block pin with alcohol.
12. Apply Loctite 638 onto the section of the new V-block pin that will be inserted into the hole.
13. Insert the new V-block pin into the hole on the carriage beam. Make sure the pin is reaches the end of the hole.
14. Reinstall the original pin support:
    
    
    
    
15. Reinstall the original support springs:
    
    
    
    
16. Install the new support cover (p/n 290B4L148A):
    
    
    
    
17. Secure the support assembly to the beam by replacing the support screws. Apply Loctite 242 to the screws.
18. Run head on install to send the carriage along the entire beam. If the error is inconsistent, adjust the carriage parallelism towards the drum.
19. Tighten the screws when finished.
20. Reinstall the rear upper and lower panels.
    

Technical contact(s)

Content owner: Itai Peperovich
See the Escalation page for escalation contacts.

Date submitted

30 Dec 2003