User's Manual

30 kW S-BAND/U ANTENNA GROUP
PREVENTIVE MAINTENANCE
4.12 Rev. C
CARD 8
NOTE
The operations described in this card are necessary only when
the RTM is connected to Display Systems type PRORA,
SELESCAN or MASTERMATE of first generation. For the
NAVBAT and MASTERMATE displays, the adjustment can be
made directly on the display.
UNIT OPERATION PERIODICITY
TRANSCEIVER Performance Monitor calibration (if present) WR
PERSONNEL REQUIRED INSTRUMENTS REQUIRED TIME
1ST Set of screwdrivers, Set of Allen wrenches, Set of
Voice Communication, Oscilloscope, Multimeter
30 minutes
SAFETY PRECAUTIONS
Follow the standard safety rules
STEP SEQUENCE OF OPERATIONS
NOTE
The voice communication device (telephone set or walkie-talkie) must be
provided between the RTM operator and the Display operator.
WARNING
HIGH VOLTAGES ARE PRESENT INSIDE THE UNIT.
DO NOT OPEN THE CABINET COVER BEFORE THE MAIN LINE
BREAKER HAS BEEN TURNED OFF. ALL WORK PERFORMED ON THE
RTM MUST BE CAREFULLY RECORDED IN THE UNIT LOG BOOK.
BEFORE STARTING ANY MAINTENANCE WORK, IT IS MANDATORY
THAT, FOR THE SAFETY OF PERSONNEL, ALL HIGH-VOLTAGE
CAPACITORS BE SHORT-CIRCUITED BY MEANS OF A WELL
INSULATED SCREWDRIVER OR OTHER SUITABLE TOOL.
BEFORE CONNECTING INSTRUMENTATION USED FOR PERFORMING
MEASUREMENTS INSIDE THE UNIT, IT IS ADVISABLE TO SWITCH OFF
THE POWER SUPPLY. DO NOT ALTER THE SETTING OF THE
SEMIOPERATIVE CONTROLS UNLESS A SPECIFIC ADJUSTMENT IS
REQUIRED AND THE NECESSARY TEST EQUIPMENT IS AVAILABLE.
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 9.1.19 pos. 2) and remove
the former.
2. On the TRANSCEIVER, pull SW2 (Chapter 9, Figure 9.1.20 pos. 1).
3. On the Display, select Performance Monitor ON and tune the RTM.
4. On the Display check that the Noise Ring is placed at the correct distance,
otherwise adjust the distance by performing the following operations:
− on the RTM CONT B Board, perform the jumper P17 (Chapter 9, Figure 9.1.22
pos. 1);
− on the RTM CONT B Board, position S2 (Chapter 9, Figure 9.1.22 pos. 3) on
position 2;
− by acting on the push-buttons plus and minus of the RTM CONT B Board
(Chapter 9, Figure 9.1.22 pos. 11), position the ring to the proper distance;
− remove the jumper P17.
(Continue)