TM 11-5840-360-14-1-1
5.17.2 Removal/Replacement Procedures
Access to the assemblies and components within
Receiver Transmitter RT-1241 is provided by releasing
(V4)
the four clamping catches on the front cover and
WARNING
removing the cover. When the cover is removed, a
INSURE ALL POWER IS REMOVED
safety interlock switch is activated which disables the
FROM THE RECEIVER TRANSMITTER
high voltage power supply; the interlock switch may be
BEFORE REMOVING COMPONENTS OR
pulled outward to permit high voltage operation if
ASSEMBLIES.
required for troubleshooting or alignment. Access to the
The following steps outline the procedure for unit access
low and high voltage power supply components is
and removal of power.
obtained by loosening the captive screws at the top of
1. Remove the receiver transmitter front cover; the
their respective assemblies and lowering the assemblies
high voltage interlock switch (S6) will automatically
into their service positions.
spring into a power disable position.
WARNING
Power may be restored to the unit with the cover
APPROXIMATELY
+12KV
DC
removed by pulling the interlock switch out.
(REGULATED) IS PRESENT IN THE
2. Turn the REMOTE ENABLE/OFF/STD BY/ ON
VICINITY OF THE MODULATOR, HIGH
switch to the OFF position. The switch is located on the
VOLTAGE MULTIPLIER COMPONENT
internal control panel.
BOARD AND MAGNETRON WHEN THE
3. Remove the fuses located on the control panel.
HIGH VOLTAGE POWER SUPPLY IS
4. Remove the four screws and remove the safety
OPERATING.
barrier.
5.17.1 Troubleshooting Procedure (V4)
CAUTION
Fault isolation within the Receiver Transmitter RT-1241
NON-FERROUS TOOLS SHOULD BE
is facilitated by use of Troubleshooting Charts. Figure
USED
WHEN
WORK
IS
BEING
PERFORMED INSIDE THE RECEIVER
TRANSMITTER. EXAMPLES OF NON-
high and low voltage power supplies. Instructions for
FERROUS MATERIALS ARE STAINLESS
use of the troubleshooting charts are given in
STEEL, ALUMINUM OR BERYLLIUM
COPPER.
WARNING
5.17.2.1 Modulator Tube V1.
THE HIGH AND LOW VOLTAGE POWER
WARNING
SUPPLIES CONTAINED IN RECEIVER
BEFORE TOUCHING ANY PARTS,
TRANSMITTER
RT-1241
UTILIZE
DISCHARGE
ANY
STORED
HIGH
FLOATING COMMON BUSSES WHICH
VOLTAGE USING A WELL-INSULATED
OPERATE AT APPROXIMATELY - 150 TO
GROUNDING LEAD.
-175 VDC WITH RESPECT TO CHASSIS.
1. Remove power per paragraph 5.17.2.
EXERCISE EXTREME CARE TO AVOID
CONTACT.
DO NOT GROUND THE
2. Remove the screw and washer located on the
FLOATING COMMON BUSSES EXCEPT
left-hand exterior of the cabinet support spring.
WHEN, AFTER ALL POWER HAS BEEN
3. Loosen the tube cap set screw and remove the
REMOVED FORM THE EQUIPMENT,
tube cap from the tube.
RESIDUAL DC VOLTAGE MUST BE
4. Twist the support clamp at the base of the tube.
DISCHARGED FOR TEST EQUIPMENT
5. Pull the tube from the tube assembly.
CONNECTION
OR
COMPONENT
6. Reinstall using the reverse of the above.
REMOVAL.
5.17.2.2 Magnetron Tube V2.
CAUTION
WARNING
WHEN IT IS NECESSARY TO CONNECT
BEFORE TOUCHING ANY PARTS, DIS
TEST EQUIPMENT 'WHICH OPERATES
CHARGE ANY STORED HIGH VOLTAGE
FROM SHIPS POWER AT RECEIVER
USING
A
WELL-INSULATED
TRANSMITTER RT 1241, ALWAYS USE A
GROUNDING LEAD.
GROUND ISOLATING ADAPTER ON THE
TEST EQUIPMENT POWER CORD.
1. Remove power per paragraph 5.17.2.
EXERCISE
CARE
TO
AVOID
2. Remove the two pins attached to the top of the
GROUNDING THE FLOATING COMMON
tube.
VIA
THE
TEST
EQUIPMENT
CONNECTIONS.
5-78
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