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TM 5-6640-213-14
Legend for figure 3-6:
Arrestment pin
1.
Screw
11.
2.
Mechanical taring suspension
12.
Weight carriage bridle
Arrestment pin
3.
Safety pin
13.
4.
Knurled screw
14.
Screw weight
5.
Knurled nut
Red nut
15.
6.
Knurled nut
16.
Red nut
7.
Red nut
17.
Red nut
8.
Knurled nut
Knurled knob
18.
9.
Knurled head screw
Screw weight
19.
Weight carriage
10.
(3) Weight counter focusing is controlled by. the long
knurled knob-located below the screws-(l) at the rear of the weight
counter.  Carefully adjust the knob until the desired focus is
achieved on the optical weight counter.
(4) Zeropoint adjustment is made by first rotating the
weight control knobs (7, fig. 2-6) and micrometer drum knob (3) until
the macro weight counter (6) and optical weight counter (5) are
returned to zero.  Move the arresting lever (2) into the pre-weigh
position (fig. 2-7), and adjust the macro weight counter (4, fig.
2-6) to zero by turning the zero control knob (1, fig. 2-6).
(5) Range adjustment of the zero ontrol knob has the
effect of recentering the knob.  Set the knob in the center of its
adjusting range without regard to the micro weight counter reading.
Arrest the beam by moving arresting lever to ,the arrest position
(fig. 2-7).  Remove the balance hood and adjust the knurled knob (18,
fig. 3-6) until the optical and macro weight counters are zeroed. If
the weight counter deviation is too great, zero the knob midrange as
described in paragraph (6) below.
(6) Macro weight counter zero adjustments begin with the
zero calibration described in paragraph (1) above.  Then arrest the
beam and remove the hood.  Loosen locking screw on the knurled screw
(4, fig. 3-6) and adjust the scale by turning the knurled screw as
required to zero the macro weight counter.  Retighten the locking
screw, release the beam and check the zero again.  Repeat the connec-
tion if the deviation now exceeds one weight counter division. As
soon as the deviation is reduced to one weight counter division,
replace the hood and use the zero control knob to adjust to zero.
(7) Check sensitivity by rotating the weight control knobs
until 01 appears on the macro weight counter while the beam is
arrested.  Place a l-g weight on the pan, release the beam and check
the zero on the optical weight counter as described in paragraph (1)
above.  Now, rotate the weight control knobs to show zero on the
macro weight counter.  Let the optical scale swing in and read the
result.  If the full deflection on 0100 is not obtained, adjust the
sensitivity by turning the knurled nut (6, fig. 3-6) to adjust the
scale accordingly.  Turn the weight control knob so tht 01 appears on
3-26

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