Product

Kodak Lotem 800 platesetter

Background

The V-block may need replacing if any of the following symptoms occur:

• Unwanted black image lines appear on exposed plate
• Lines on plate have inconsistent thickness
• Distance between unwanted lines is either a consistent 1.3 mm apart, or 2.4 mm apart. These two distances represent one rotation of the lead screw.
• Broken dots appear on either side of unwanted lines
  
  

Requirements

Procedure

This procedure consists of the three steps:

• Removing the existing V-block
• Assembling the replacement V-block
• Calibrating the Lotem 800 platesetter

Removing the existing V-block

1. From the hardware tree, send the carriage to absolute position 1150.
   (Hardware/Expose System/Carriage System /Carriage Motor).
2. Open the top rear cover.
3. Remove the upper rear panel.
4. Shut down the platesetter via the main power switch.
5. Remove the unloading tray.
6. From the right side of the platesetter, remove the right local board—located close to the carriage motor.
   Note: If the Lotem 800 platesetter is a Local2 device, remove the local board on the left side in addition to the local board on the right side.
   
   
   
   
7. From the left side of the platesetter remove the oil bracket.
   
   
   
   
8. Remove the three screws securing the leadscrew coupling.
   
   
   
   
9. From the right side of the platesetter, disconnect the stepper motor connector, and the coarse and fine home position detectors.
   
   
   
   
10. Remove the four screws securing the bearing house to the V-block. Make sure you also remove the grounding wire and the Molex connector—both of which are secured with screws.
11. Extract the leadscrew and the attached motor. Be careful not to damage the leadscrew or leadscrew threads.
12. Secure the alignment jig (290B8L013) to the carriage.
    
    
    
    
    
    
    
    
13. Manually slide the carriage to the left side of the V-block.
14. Use the alignment jig to record the distance between the carriage and the drum surface.
15. Remove the two screws securing the L-box, and then open the
    L-box.
    
    
    
    
16. Carefully extract the carriage and the attached jig from the V-block.
    Note: Do not remove the jig.
17. Use a 39 nm (350 lb/in) torque to remove the four screws from the underside of the platesetter. Note that there are two screws on the left underside and two screws on the right underside.
    
    
    
    
    
    
18. Remove the V-block from the platesetter.

Assembling the replacement V-block

1. Use alcohol to clean the underside of the replacement V-block.
2. Install the replacement V-block onto the drum chassis.
3. Insert, but do not tighten, the four V-block screws.
4. Install the carriage, but not the leadscrew, onto the V-block.
5. Manually slide the carriage to the position recorded with the alignment jig - see step 14.
6. Use the alignment jig to record the distance between the carriage and the drum surface. If required adjust the V-block until the distance is equal to the distance recorded in step 14.
7. Manually slide the carriage to the right side of the V-block, and record the distance between the carriage and the drum surface. If the difference between the two recorded measurements is greater than 5 microns, adjust the V-block until it is parallel along its entire length with the drum surface.
8. When the V-block is parallel to the drum, use the 39 nm (350 lb/in) torque to tighten the four V-block screws.
9. Verify that the carriage is still parallel to the drum surface
   (±5 microns). If required, release the V-block screws and repeat steps 7 to 9 inclusive.
10. Remove the alignment jig from the carriage.
11. Insert the coupling locator jig (291A3L006) through the lower hole on the coupling.
12. Insert the coupling into the carriage.
13. Use the coupling locator jig to align the hole on the carriage to the hole on the coupling.
    
    
    
    
14. Insert, but do not tighten, the upper two coupling screws.
15. Remove the coupling locator jig and insert the third screw into the coupling.
16. Tighten all three coupling screws.
17. Reinstall the four screws securing the bearing house to the
    V-block. Make sure you also reinstall the grounding wire and the Molex connector.
18. From the right side of the platesetter, reconnect the stepper motor connector, and the coarse and fine home position detectors.
19. Use silicon oil to lubricate the inner surface of the V-block and oil bracket.
20. From the right side of the platesetter, reinstall the right local board. If the Lotem 800 platesetter is a Local2 device, also reinstall the local board on the left side.
21. Reinstall the unloading tray.
22. Reinstall the upper rear panel.
23. Close any open doors and covers.
24. From the main power switch, reconnect the power to the platesetter.
25. From Lotem Controller, send the carriage to home position and end position. This ensures that the V-block is well lubricated.

Calibrating the Lotem 800 platesetter

Calibrate the Lotem 800 platesetter as described in the Lotem 800 Calibration procedure.

Technical contact(s)

Content owner: Alon Davidor
See the Escalation page for escalation contacts.

Date submitted

24 Oct 2006