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

Page: 39 / 112

NAVIGAT X Mk 2 056341 Rev. AA
4: Preventive Maintenance Page 4-5
4.2.3 Re-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.
Caution
The gyrosphere container with the gyrosphere installed must be handled very
carefully. The container must be kept in an upright position at all times.
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) Unpack the gyrosphere container from its storage box and carefully take it
to the compass' location.
6) 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