Figure 4-53.--Block diagram of ship's course indicators.
rotor voltage. Because thes synchro voltage is very low,
Such routine maintenance should not be recorded in the
the amplifier output and motor torque are reduced
service record book. Repairs or replacement of parts
substantially to zero.
resulting from such maintenance, however, should be
recorded to aid those involved with future repairs to the
Mixing networks and antistickoff voltages are
unnecessary in 1-speed systems. Although synchro
voltage, and thus motor torque go to zero at the 180°
The technical manual sent with the Mk 19
point, this point is an unstable (decentering) null. If the
gyrocompass and the WSN-2 is laid out in such a
servo approaches this false null with slight overshoot,
manner as to greatly assist the troubleshooter. You
the servo will not come to rest at the null. Instead, the
servo will continue to rotate toward the true null, where
should carefully study these technical manuals before
it will come to final rest.
starting any maintenance action.
Maintenance should not be undertaken by
inexperienced personnel without close supervision of a
qualified maintenance technician.
Ships having the Planned Maintenance System
In the future, interior communications personnel
(PMS) installed should perform gyrocompass
can look forward to the use of lasers and fiber optic
maintenance requirements as indicated on the
cables for navigation and communications.
equipment maintenance requirement cards (MRCs).