ETC Source Four - Adjustments; Lamp Centering and Field Adjustment; Beam Focusing

9
Front barrel assembly
Tools required: Phillips head screwdriver.
1. Stand the top and bottom front barrel castings (1 and 2) upright with the shutter openings down.
Note: The top front barrel casting contains the iris slot.
2. Slide in the bottom divider plate (4). The dimples on the divider plate must point down.
Note: The notches on the divider plates must fit snugly against the flanges in the casting so the plates
do not move.
Warning: Divider plate edges are sharp. Handle with caution!
3. With the bottom barrel to your left, place two shutter blades (3) on top of dimple plate (4), handles facing
outward, up and down.
Note: Install shutter blades with the rounded side facing up toward the front of the casting.
4. Place the middle divider plate (5) on top of the two shutter blades.
5. Place the two remaining shutter blades on top of the middle divider plate. Pull the blade and plate
assembly slightly forward to allow the handle to slip through the slot in the bottom casting.
Note: The third and fourth shutter blades should be at 90˚ angles to the first and second.
6. Place the top divider plate (6) on top of the third and fourth shutter blades.
Note: Make sure no shutter assembly components are under the pattern holder guides.
7. With both front barrel castings still standing upright, join the two halves, sliding the handle of the top
shutter blade through the slot in the top front barrel casting (1).
8. Starting at the bottom of the castings (closest to the shutters), use four PHMS screws (9) and Ny-lok
nuts (8) to fasten the front barrel casting halves together, as shown. Hold the Ny-lok nuts tight against
the casting while tightening the screws. Torque the screws to 25 inch/pounds.
Note: The tops of the two front barrel castings must be even. Adjust as necessary before completely
tightening the nuts and screws. Failure to do this could interfere with the barrel rotation.
9. Turn the front barrel assembly over so that the narrower end is on your work surface.
10. Install the four shutter springs (7) between the four dimples in the shutter plate and the tabs in the lip of
the casting.
Note: Install the springs at the joints in the castings on either of the tabs at the joint. Once they are
installed, the springs at the joints will sit at a slight angle.
Caution: During assembly, the shutter springs can pop out of place. Always wear protective eyewear
during this procedure.
11. Place iris slot cover (10) over the iris slot. Use two screws (11) to secure the cover.