TM 11-5840-217-34-1
d. Set the AZIMUTH counter to 1, 600 mils. Loosen the locknut and adjust the X + CAL (R1502) control for PLUS 14,
000 meters on the X counter; tighten the locknut.
e. Set the AZIMUTH counter to 4, 800 mils. Loosen the locknut and adjust the X - CAL (R1504) control for a reading
of MINUS 14, 000 meters on the X counter; tighten the locknut.
7-15. PLOTTING BOARD INDICATOR LIGHT FOCUS ADJUSTMENT
a. Remove the cover plate from the round access hole on the bottom of the plotting board (right side) by removing the
eight screws that hold the plate in place.
b. Remove the Allen wrench from the clip attached to the cover plate.
c. Place a piece of masking tape on the Plexiglas directly above the indicator light.
d. With the Allen wrench, slightly loosen the two setscrews (90 degrees apart) nearest the lamp.
e. While observing from the top of the plotting board, move the lens up and down and roughly focus the light to obtain
the smallest spot of light on the masking tape.
f. Tighten the two setscrews nearest the lamp base and slightly loosen the other setscrews (90 degrees apart) that are
farthest from the lamp base.
g. Again, while observing from the top of the plotting board, slowly raise and lower the lens until the smallest spot of
light on the masking tape is obtained; tighten the setscrews.
h. Rotate the carriage arm (through 180 deg.) by using the AZIMUTH handwheel on the radar set control unit. Be sure
that the light does not touch the Plexiglas.
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