SRT X-BAND RADAR SYSTEMS
PREVENTIVE MAINTENANCE
304202P003 4.6 Rev. C
CARD 3
UNIT OPERATION PERIODICITY
SRT 12 KW
X-BAND
Replacement of the Magnetron WR1 (8000 hours)
PERSONNEL REQUIRED INSTRUMENTS REQUIRED TIME
1JT Set of screwdrivers, Electric Soldering Iron, Silicone
grease compound 340
30 minutes
SAFETY PRECAUTIONS
On the electric switchboard, set to OFF the Main Line Breaker relevant to the unit and hang to it
a placard reading "WORK IN PROGRESS - DO NOT SWITCH ON"
STEP SEQUENCE OF OPERATIONS
Preliminary Operations
1.
Position the Antenna as shown in Chapter 9, Figure 9.1.1.
2.
Unscrew and remove the four screws (Chapter 9, Figure 9.1.4, pos. 1) locking the cover
(pos. 2) and open the former.
Removal
3.
Unscrew the 4 screws holding protection shield (Chapter 9, Figure 9.1.6, pos. 9)
4.
By means of the proper screwdriver, remove the Magnetron wires from the terminal
(Chapter 9, Figure 9.1.15 pos.1) tacking note of their disposition:
• Unplug yellow and green cables loosing the 2 bolts
• Unplug the yellow-green earth cable
5.
By means of the proper screwdriver, unscrew the screws (Chapter 9, Figure 9.1.27 pos.
1 and pos. 6) fixing the Magnetron (pos. 2).
6.
Remove the Magnetron.
Installation
7.
Before fastening the Magnetron to the proper seat, spread a layer of silicone grease on
Magnetron surface which is in contact with the alloy in order to increase the Magnetron
heating surface dissipation.
8.
In order to install the new Magnetron, perform the removal operations in reverse order.
Calibration
WARNING
IN ORDER TO PREVENT ANY ACCIDENTAL ROTATION OF THE
ANTENNA, DISCONNECT THE MOTOR FROM THE BRUSHLESS
CONTROLLER BOARD AND UNPLUG THE 5 PIN CONNECTOR.
9.
On the electric switchboard, set to ON the Main Line Break relevant to the unit and
remove the warning placard.
10.
Position the selector S1 of SRT_Control Board (Chapter 9, Figure 9.1.17 pos. 6) on
position 2.
11.
Perform the following operations:
- on the SRT_Power board, made a link P1 (Chapter 9, Figure 9.1.10, pos. 5),
- before switching on, wait for 30 minutes.
12.
By following the procedures of display manual, perform the VCO calibration.
Final Operations
13.
Perform the following operations:
- on the SRT_Power remove the link P1 (Chapter 9, Figure 9.1.10, pos. 5),
- on SRT_Control Board, position S1 (Chapter 9, Figure 9.1.17 pos. 6) on 0 (zero).
14.
Unlock and close the equipment cover by following the reverse procedure.
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