TM 5-6675-328-14
(19)
If necessary, adjust focusing lens of MTC:
NOTE
If infinity reticle image of MTC is sharp, do not adjust focusing lens.
(a)
Loosen three focusing lens adjustment screws.
(b)
Carefully slide focusing lens back and forth until infinity reticle image of MTC comes into sharp focus.
(c)
Snug the three adjustment screws and verify that infinity reticle image is still in sharp focus. Do not
overtighten screws.
(20)
Position collimators using mounting base adjustment screws until infinity reticle image of MTC is in vertical and
horizontal register with reticle image of AS-1.
NOTE
Centerline of collimators must be within 0.1 inches (2.5 mm) of each other.
Use only the filar portion of a filar bi-filar pattern; the bi-filar portion may not be exactly centered with respect to the
filar position.
(21)
Rotate MTC 1800 in its mount. Check for out-of-register condition of vertical wire images only. If out-of-register
condition is present, remove one-half of the error using the opposing reticle adjustment screws. Remove
remaining error with tangent screws of AS-1 mounting base.
(22)
Rotate MTC 1800 in its mount and repeat steps (20) and (21) until vertical wires remain in register.
(23)
Rotate MTC 900 and repeat steps (20) through (22).
(24)
Adjust each of the remaining reticles in accordance with steps (20) thru (22) by focusing the AS-1 to receive the
image of each remaining reticle in turn.
(25)
Install the MTC in center tube of target post:
(a)
Remove mirror mounting assembly from front of center tube.
(b)
Remove two lower adjustment screws and spring plungers from horizontal tube and back out adjustment
screw at both ends of the tube.
(c)
Remove auxiliary lighting unit from MTC. Clean barrel and lens (table 2-1)
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