TM 5-6675-328-14
WARNING
To avoid electrical shock and short circuits, disconnect the optical plummet control handle before plugging
in power cord.
(m)
If installed, disconnect OPC control handle, plug in power cord, and turn on light to AS-1.
(n)
Use stellite mirror to verify that the AS-1 is focused for infinity by autocollimating off the mirror. If the
reflected image is not in clear focus, adjust the focusing knob until the image becomes sharp. Turn off light.
(o)
Turn on light to OPC and adjust collimators until the infinity reticle image of the OPC is in verticle and
horizontal register with reticle image of AS-1.
NOTE
If the infinity reticle image of the OPC is not sharp, damage to either the objective lens or the infinity
reticle has occurred. Refer to higher level maintenance.
(p)
Rotate the OPC 180 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 horizontal setscrews located toward eyepiece end
of OPC. Remove remaining error by using tangent screws of the mount supporting the AS-1.
(q)
Rotate the OPC 180 and verify the adjustment. Continue rotating and adjusting until vertical wires remain
in register.
(r)
Rotate the OPC 90 and repeat steps (o) thru (q) until vertical wire images remain in register.
(s) With both vertical and horizontal wires in register, rotate the OPC 180°. If the wires remain in register,
adjustment is complete. If they do not, repeat steps (o) thru (r) until they remain in register.
(t)
Use the adjusting screws to adjust the two remaining reticles (16 ft and 6 ft); focus the AS-1 to receive the
image of each of the remaining reticles in turn and use the procedures in steps (o) thru (s) above.
(u)
Focus the AS-1 on the autoreflection target of the OPC.
(v) Bring the AS-1 reticle into exact register with horizontal and verticle lines of the OPC target.
(w)
Rotate the OPC 180 in its mount. If an out-of-register condition is ,j observed, remove one half of the
error using the setscrews located nearest the objective end of the OPC.
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