TM 11-5840-360-14-1-1
5.10.2 Removal/Replacement Procedures
1. Insure removal of power from the unit per
Before initiating any removal or replacement activity
at Receiver Transmitter RT-1240, insure that all power
2. Remove front cover; loosen control panel
is removed from the equipment by performing the
captive screws and swing control panel into its service
following steps:
position.
1. Insure that POWER switch is set to OFF at
WARNING
associated (master) Indicator.
RESIDUAL
HIGH
VOLTAGE
2. Set LOCAL TEST switch to OFF.
CHARGES MAY BE PRESENT.
3. Turn off ships circuit breakers which supply
DISCIIARGE
ALL
MAGNETRON
power to Receiver Transmitter RT-1240 under test.
TUBE
TERMINALS
AND
ALL
NOTE 1:
COMPONENTS IN THE VICINITY OF
When the Receiver Transmitter cover
THE MAGNETRON TUBE BEFORE
is removed, the high voltage
TOUCHING.
interlock
switch
automatically
3. Disconnect filament plug (potted wire terminals).
springs to a power disable position.
4. Loosen the alien screws on the tuning rod and
Power may be restored to the unit
disconnect the rod.
with the cover removed by pulling
5. Remove the six screws, washers and
the interlock switch outward.
lockwashers and lift the magnetron oscillator out.
6. Reinstall using the reverse of above.
CAUTION
5.10.2.3 T/R Limiter V3. - See Figure 5-1; refer to
ONLY
NON-FERROUS
TOOLS
assembly drawings in Chapter 6, Section 6.2 as
SHOULD BE USED WHEN WORK IS
necessary.
BEING PERFORMED INSIDE THE
1. Insure removal of power from the unit per
RECEIVER TRANSMITTER UNIT.
EXAMPLES
OF
NONFERROUS
2. Remove front cover; loosen control panel
MATERIALS
ARE
STAINLESS
captive screws and swing control panel into its service
STEEL, ALUMINUM OR BERRYLIUM
position.
COPPER.
WARNING
5.10.2.1 Modulator Tube V1. - See Figure 5-1; refer to
RESIDUAL
HIGH
VOLTAGE
assembly drawings in Chapter 6, Section 6.2 as
CHARGES MAY BE PRESENT.
necessary.
DISCHARGE ALL COMPONENTS IN
1. Insure removal of power from the unit per
THE VICINITY OF THE T/R LIMITER
BEFORE TOUCHING.
2. Remove front cover; loosen control panel
3. Remove the IF Amplifier Assembly per
captive screws and swing control panel into its service
position.
4. Remove the four screws, washers and
WARNING
lockwashers that attach the T/R limiter to the duplexer
RESIDUAL
HIGH
VOLTAGE
assembly. Note orientation of the T/R limiter.
CHARGES MAY BE PRESENT.
5. Remove the four screws, nuts and washers that
DISCHARGE
ALL
MODULATOR
attach the T/R limiter to the waveguide flange and
TUBE
TERMINALS
AND
ALL
remove the T/R limiter.
COMPONENTS IN THE VICINITY OF
6. Reinstall new T R Limiter with correct
THE MODULATOR TUBE BEFORE
orientation using the reverse of the above.
TOUCHING.
5.10.2.4 Local Oscillator Assembly X2. - See Figure 5-
3. Remove the screw and washer, located on the
left-hand outer side of the cabinet, that retains the nylon
as necessary.
rod, supporting spring and tube cap.
1. Insure removal of power from the unit per
4. Loosen the tube cap set screw and remove the
tube cap from the tube.
2. Remove front cover; loosen control panel
5. Loosen retaining clamp at the base of tube.
captive screws and swing control panel into its service
6. Pull the tube from the tube base assembly.
position.
7. Reinstall using the reverse of the above.
3. Remove the IF Amplifier Assembly per
5.10.2.2 Magnetron Oscillator V2. - See Figure 5-1:
refer to assembly drawings in Chapter 6, Section 6.2 as
necessary.
5-19
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