TM 55-6680-234-40
Figure 6. Wiring Diagram
lies in the adjustment of the hair-
tain that the return paths and other compo-
spring. Recheck as outlined in g(5)
nents are securely locked in position with pur-
and (6) above. Place mehanism in
ple glyptol.
normal upright operating position
(dial vertical), Balance unit, as nec-
dial spacer (5) assembled mechanism into case
essary, to maintain proper calibration
assembly (4). Install end cover assembly (28)
by adding balance springs (9 of fig-
so centers of two receptacles are on a hori-
zontal line with unit in normal upright oper-
of figure 8).
ating position with polarizing key of each re-
(3) Again place mechanism in the ver-
ceptacle in the 12 o'clock position in its
tical position (dial horizontal) and
opening.
calibrate the rear motor assembly in
a manner similar to the preceding
procedure except as follows: (This
Comp Sn 63, seal end cover (28) to case assembly (4)
motor also must start with applicat-
ion of 150 RPM as in (2) above.)
around end cover (28) and case assembly (4) to pro-
vide a tight seal
Operate indicator generator at 4516
RPM and adjust rear return path
Caution: Avoid excess solder.
to obtain a reading of 340 RPM.
n. Perform scale error, pointer alignment
p. Pressurize indicator to 20 psi and im-
error, friction error, pointer oscillation error,
merse it completely in clear clean alcohol. Any
and position error tests as outlined in para-
bubbles coming from within the use indicate
a leak which must be repaired. Correct any
Procedure. When these tests have been con-
leak by replacing the defective component or
cluded with unit within tolerance, make cer-
by repairing the faulty soldered joint.
16
