NORTHROP GRUMMAN Sperry Marine NAVIGAT X MK 2, Assembly Instructions Manual

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056341 Rev. AA NAVIGAT X Mk 2
Page 8-8 8: Gyroshpere Installation and Service
8.3.2 Installing the gyrosphere container in the compass housing
Parts required
– a 5mm Allen key
– a No. 2 Philips-head screwdriver
Procedure
1) Make sure the compass' main and backup power supplies are switched off
and safeguarded against accidental switching-on.
2) Unscrew the 5 mm Allen-head screws of
the compass housing door and take off
the door from the housing
3) Disconnect the grounding strap be-
tween door and housing. Place the door
aside. If the door is put next to the hous-
ing, the keypad's ribbon cable can be left
connected to the main PCB.
4) Gently turn the bellows, until the largest
of the three coupling seats in the bayo-
net collar points towards the front of the
housing. the seat is marked by a green
dot on the collar.
5) Place the gyrosphere container into the
compass housing with the largest of the
three coupling tongues located directly
below the groove in the collar. The
tongue is marked by a green dot on the
container
6) Put both hands around the container and
lift it into the collar, so that the coupling
tongues slide into the corresponding
grooves in the bayonet.
7) While supporting the container with both
palms, put the thumbs on the rim of the
collar and turn the collar to the right