TM 5-6675-328-14
(x)
Repeat steps (y) and (w) until no out-of-register condition is observed.
(43)
When alinement is completed, turn off lights, remove power cord and light from OPC, and reassemble OPC as
follows:
(a)
Install spacer tube on end of OPC and secure with objective cap ring.
(b)
Remove eyepiece adapter from OPC.
(c)
Aline match marks and install the axis ring and secure with four socket head setscrews.
(d)
Screw eyepiece adapter back on OPC.
(e)
Carefully lower the OPC into the adapter tube.
(f)
Install four socket head capscrews that secure spherical mount and tighten capscrews.
(g) Aline match marks and install axis gear, spring plungers, springs, and spring bodies in the adapter tube.
(h)
Center eyepiece end in adapter tube using axis gears.
(i)
Install OPC in accordance with paragraph 2-20.4.
h. Preparation/Installation of Model 81 Alinement Telescope (AS-1) and Model 381-1 Alinement Telescope (AS-2).
(1)
Turn on light to AS-1.
NOTE
Position AS-1 so that adjustment screw holes will not contact V-blocks and interfere with rotation.
(2)
Place AS-1 so that objective end is pointed toward MTC. Adjust eyepiece of AS-1 until reticle becomes sharp.
(3)
Place stellite mirror on adjustable mirror mount in front of MTC.
NOTE
Adjust mirror base as necessary to obtain reflected image.
(4) Focus AS-1 to infinity by autocollimating off mirror. Adjust focusing knob until reflected image of reticle comes
into sharp focus.
(5)
Turn off light and remove stellite mirror from target post.
(6) Turn on light to MTC.
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