User's Manual

30 kW S-BAND/U ANTENNA GROUP
PREVENTIVE MAINTENANCE
4.6 Rev. C
CARD 4
UNIT OPERATION PERIODICITY
TRANSCEIVER Replacement of the Magnetron WR (8000 hours)
PERSONNEL REQUIRED INSTRUMENTS REQUIRED TIME
1JT Set of screwdrivers, Silicone grease compound
340
45 minutes
SAFETY PRECAUTIONS
On the electric switchboard, set to OFF the power breaker relevant to the unit and hang to it a
placard reading "WORK IN PROGRESS – DO NOT SWITCH ON"
STEP SEQUENCE OF OPERATIONS
Removal
1. By means of the proper screwdriver, unscrew the 6 screws (Chapter 9, Figure 9.1.19
pos. 1) locking the front cover (Chapter 9, Figure 9.1.23 pos. 2) and open the former.
2. Disconnect the Magnetron (Chapter 9, Figure 9.1.21 pos. 1), by extracting it from the
relevant site.
3. By means of the proper screwdriver, unscrew the six screws (Chapter 9, Figure
9.1.21 pos. 2) fixing the Magnetron (Chapter 9, Figure 9.1.21 pos. 3) to the support
(Chapter 9, Figure 9.1.21 pos. 4).
4. Remove the Magnetron from its support.
Installation
5. Before fastening the Magnetron to the proper seat, spread a layer of silicone grease
on the Magnetron surface which is in contact with the cabinet rear wall in order to
increase the Magnetron heating surface dissipation.
6. In order to install the new Magnetron, perform the removal operations in reverse
order without closing the cover.
7. Position selector S2 of RTM CONT B Board (Chapter 9, Figure 9.1.22 pos. 3) on
position 2.
8. Perform the following operations:
− position the power breaker to ON;
− remove the Power Supply cover;
− on the Power Supply, position the switch SW1 on position SERVICE MODE;
− wait for 15 minutes.
As an alternative, set the Display in Stand-by and wait for 15 minutes.
9. By following the procedures of Card 6, perform the VCO calibration.
10.
By following the procedures of Card 8, perform the calibration of the Performance
Monitor circuit (if present).
11. Perform the following operations:
− on the Power Supply, position the switch SW1 on position NORMAL
− on RTM CONT B Board, position S1 (Chapter 9, Figure 9.1.22 pos. 2) and S2 on
0 (zero)
− close the front cover and tighten the 6 screws as necessary