Figure 4-53.--Block diagram of ship's course indicators.

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

gyrocompass.

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

MAINTENANCE OF

inexperienced personnel without close supervision of a

GYROCOMPASSES

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).