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 TM 55-1905-220-14-11
5-117. SHIP'S COURSE INDICATOR - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL-ADJUSTMENT (Cont)
d. Before proceeding with the zeroing of the synchros, observe that the indicator returns to rest promptly after
being driven off null. If the indicator response is sluggish or oscillatory, adjust damping rheostat R6 for rapid response
with up to four overshoots.
e. Connect the indicator to a two-speed synchro data source and connect power to proper terminals. Set the 1X
and 36X synchro data source to null position.
f. Remove power from the indicator and loosen the clamps holding both single and 36X speed synchros in the
unit. Remove the R1 lead from the 36X speed synchro (B02).
g. Turn power back ON and let the unit drive to a null on the one-speed data only.
h. If the servo oscillates adjust the damping control (R6) on the amplifier to correct this condition.
i. Rotate the single speed synchro stator allowing the servo to follow until the zero of the inner dial is aligned
with +1.0 degrees with the zero of the outer dial. Clamp B01 stator while maintaining alignment. Turn power OFF.
Replace the R1 lead on 36X speed synchro and remove the R1 lead from the one-speed synchro.
j. Turn power back ON and let the servo drive to null on the 36X speed data only. It may be necessary to adjust
the damping control (R6) to eliminate dial oscillations.
k. Rotate the 36X speed synchro stator until the zeros of the inner and outer dials are aligned within + 0.1
degree. Clamp the synchro stator while maintaining this alignment. Replace R1 lead to the 1X synchro.
7. System Damping.
a. If a synchro is removed for test or is replaced, zero it to the indicator dial zero by means of the preceding
procedure. To complete the alignment, you will need a signal input to the indicator from a source of synchro data that can
be held fixed at one angle while you check a synchro and that can be changed to another angle while you observe the
indicator in operation. You will also need a source of power to energize the amplifier and servomotor if the indicator is a
servo type. BE SURE TO USE THE PROPER POWER FREQUENCY.
5-1340
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