User's Manual

30 kW S-BAND/U ANTENNA GROUP
CORRECTIVE MAINTENANCE
6.5 Rev. C
6 .2 .1 .5 Replacem ent of t he N I FB Assy
a) Required Tools
- set of screwdrivers
b) Removal
1. By means of the proper screwdriver, unscrew the six
screws (Chapter 9, Figure 9.1.29 pos. 1) locking the front
cover (Chapter 9, Figure 9.1.29 pos. 2) and open the former
2. Remove the NIFB Assy (Chapter 9, Figure 9.1.31 pos. 4)
cabling by tacking note of its disposition
3. By means of the proper screwdriver, unscrew the four
screws (Chapter 9, Figure 9.1.31 pos. 5) fastening the NIFB
Assy to the Electronics Assy mechanical frame and remove
the NIFB
c) Installation
1. In order to install the new NIFB Assy, perform the removal
operations in reverse order
2. By following the procedures of Card 6 of Chapter 4,
calibrate the VCO
6 .2 .1 .6 Replacem ent of t he Ma gne t r on
To replace the Magnetron, perform the procedures of Card 4 of Chapter 4.
6 .2 .2 Replacem ent Pr ocedures for t he Ant enna
Pede st al S/ U Unit
6 .2 .2 .1 Driving Be lt Replace m ent
a) Required Tools
- Set of open wrenches
- Set of Allen keys
- Set of screwdrivers
b) Removal
1. By using the proper open wrench, loose and remove the
four nuts (Chapter 9, Figure 9.1.32 pos. 1) fixing the cover
(Chapter 9, Figure 9.1.32 pos. 2) and remove the former
2. Disconnect the connector of the Cable Assy (Chapter 9,
Figure 9.1.33 pos. 1) from the one coming from the RTM
3. By using the proper open wrench, loose and remove the
bolts (Chapter 9, Figure 9.1.33 pos. 2) fixing the antirotating
structure (Chapter 9, Figure 9.1.33 pos. 3) to the Pedestal