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 TM 55-1905-219-14-11
5-117. SHIP' COURSE INDICATOR - MAINTENANCE INSTRUCTION (Continued).
S
LOCATION
ITEM
ACTION
REMARKS
OVERHAUL-ADJUSTMENT (Cont)
b. Connect the indicator to a source of 115-volt 400-cps power and connect the 2.5 volt secondary (amplifier
terminals A1-12 and A1-13) in series with the R leads of the one-speed synchro. Complete the zeroing of the synchros of
the indicator by following the procedure of OP 1303 while this anti-stickoff voltage is applied. With the synchros in their
zeroed positions, set the synchro data source accurately to zero, and observe that the indicator synchros do not move,
and that the control field (amplifier terminals 2 and 4) of the servo-motor is below 2-volts rms.
RESISTANCE DATA FOR ROTATING COMPONENTS.
Winding Resistance (Ohms)
400 Cps Synchro
(S1 - S2)
838
Stator
(S2 - S3)
838
(S3 - S1)
838
Rotor
(R1-R2)
413
Winding
(Ohms)
400-cps Servomotor
Resistance
Fixed
1-3
120
Phase
Control
2-5
60
Phase
4-6
60
c. Observe that the indicator smoothly follows rotation of the J synchro data source. Return the data source to zero,
de-energize the servo amplifier, rotate the data source to 180 degrees, reenergize the servo and observe that the
indicator dial moves to its new position with up to four overshoots. If the dial overshoots its final position more than four
times, adjust the damping control. If the dial does not overshoot, clean the gear train and adjust the damping control.
5-1339
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