Lotem 400

FCO 510F26192 - Replacing all six Head Spoilers From 8 mm pins to 12 mm pins

Yaron Soffer
22-Mar-01

Abstract:

The purpose of this FCO is to solve registration problems of plates that are more than 550 mm wide. In addition, the Head Spoilers with 8 mm pins will be replaced with 12 mm Spoilers.
The gap between the drum and the spoilers was reduced at all the six spoilers to have good attachment of 0.15 mm plates.
The procedure includes the following steps:

• Replacing all four Head spoilers with the new ones.
  
• Verifying image parallelism for large plates
  
• InitiaI installation of inner spoilers.
  
• Verifying image parallelism for small plates
  
• Adjusting the spoilers.
  
• Attaching RTV to spoilers
  

Parts

The FCO includes the following:

Note: To adjust the two inner spoilers you need a 400 mm ruler.

Replacing all head spoilers with the new ones

1. Unscrew and remove the spoilers.
   
2. Position the new small outer spoilers and tight them using new screws.
   
3. Position the other four new spoilers using new screws, do not tight the screws.
   
4. Place a ruler under the small outer spoilers. Drag the spoilers until it touches the ruler and tighten them.
   
   
   

Verifying image parallelism for large plates
1. Load a plate on the machine, minimum width of 550 mm.
2. Expose a strip file of maximum width with a margin of 20 mm.
3. Measure the distance between the exposed file and the edge of the plate on both sides of the plate.

4. Verify that the difference between the two measurements (A and B) is not greater than 0.1 mm.
5. If the difference is more than 0.1 mm, you need to adjust the two outer spoilers (see Adjusting the Spoilers).

Verifying image parallelism for small plates
1. Load a plate on the machine, maximum width of 550 mm.
2. Expose a strip file of maximum width with a margin of 20 mm.
3. Measure the distance between the exposed file and the edge of the plate on both sides of the plate.

4. Verify that the difference between the two measurements (A and B) is not greater than 0.1 mm.
5. If the difference is more than 0.1 mm, you need to adjust the two inner spoilers (see Adjusting the Spoilers).

Adjusting the Spoilers
1. Select A or B, whichever is bigger, and move spoiler on that side slightly towards the Head Grippers (away from the vacuum tunnels) by opening the spoiler screws.
2. Tighten the spoiler and re-expose the same file.
3. Recheck the differences between A and B.
Repeat this procedure until you get a maximum tolerance of 0.1 mm.

Attaching RTV to the Spoilers
Attach the RTV to the back side of the spoiler on both sides of the spoiler (on the curved side), as shown in the figure below.