TM 11-5840-360-14-1-1
3. Remove the two screws and connecting nut
3. Remove the four screws, washers and
holding the local oscillator to the Mixer assembly. This
lockwashers located on the base of the magnetron
will free the harness and the local oscillator from the
shroud.
Mixer assembly.
4. Remove the six screws, washer and
4. Remove the nine slotted head screws, washers,
lockwashers attaching the magnetron tube to the
and lockwashers that hold the IF Amplifier assembly
magnetron bracket.
cover. Remove the cover.
5. Lay the shroud/bracket assembly forward.
5. Disconnect the two wires, noting connection
6. Turn the large hex nut counterclockwise to
locations, between the feed-through capacitors of the
release the magnetron tube from the microwave
Mixer assembly and the IF Amplifier PCB assembly.
assembly.
6. Remove the hex nuts on the inside of the IF
CAUTION
Amplifier assembly to separate the Mixer Assembly
PULL THE MAGNETRON FORWARD
from the IF assembly.
CAREFULLY TO PREVENT DAMAGE
7. Remove the ten hex head screws, washers,
TO THE GLASS PROBE THAT
lockwashers, and nuts that hold the Mixer assembly to
EXTENDS INTO THE HEX NUT
the T/R Cell, and remove the T/R Cell.
OPENING.
8. Reassemble using the reverse of the above,
7. Reassemble using the reverse of the above
insuring that the T/R Cell OUTPUT is in the "up"
procedure.
position.
5.17.2.3 T/R Cell.
5.17.2.7 Local Oscillator Assembly.
1. Remove power per paragraph 5.17.2.
1. Remove power per paragraph 5.17.2.
2. Perform the procedure given in paragraph
2. Tag the three grey covered red and black
twisted pair wires, noting the termination points (TUNE,
provide access needed for the replacement of the T/R
+12, and -12), then disconnect the wires from the local
Cell.
3. Remove the ten hex head screws, washers,
3. Remove the four slotted head screws, washers,
lockwashers and nuts that attach the T/R Cell to the
lockwashers and nuts to free the local oscillator from the
Microwave Assembly.
Mixer assembly.
4. Remove the ten hex head screws, washers, and
4. Reassemble using the reverse of the above,
lockwashers that attach the T/R Cell to the circulator
insuring the correct wire hook-up locations.
and remove the T/R Cell.
5.17.2.8 Microwave Assembly A8.
5. Reassemble using the reverse of the above,
1. Remove power per paragraph 5.17.2.
insuring that the T/R Cell OUTPUT is in the "up"
2. Disconnect the magnetron shroud assembly and
position.
lay forward per paragraph 5.17.2.2.
5.17.2.4 Limiter Diode.
3. Disconnect the IF Amplifier assembly per
1. Remove power per paragraph 5.17.2.
2. Remove the limiter diode located on the lower
4. Remove the exterior waveguide connection on
side of the Mixer assembly by screwing in a
the right-hand side of the cabinet.
counterclockwise direction.
5. Remove the ten hex head screws and
3. Reinstall diode using caution not to over tighten,
lockwashers located on the cabinet exterior which hold
as the diode must seat firmly, but will break if tightened
the microwave assembly.
too far into the assembly.
6. Remove the hex head screws and lockwashers
5.17.2.5 Mixer Diodes.
located at the inside rear of the cabinet which attach the
1. Remove power per paragraph 5.17.2.
Microwave Assembly and lift the Microwave Assembly
2. The mixer diodes are located on the upper side
out.
of the Mixer assembly. They may be removed by
7. Reassemble using the reverse of the above.
unscrewing the slotted caps of the enclosures.
5.17.2.9 IF Amplifier Assembly.
3. Reinstall the matched pair of diodes (part
1. Remove power per paragraph 5.17.2.
numbers 167579-7 and -8) with careful attention to the
2. Open and lower the control panel; disconnect
correct polarity as noted on the case.
the BNC connector below the IF assembly.
5.17.2.6 Mixer Assembly.
3. Disconnect the harness connector just to the
1. Remove power per paragraph 5.17.2.
right of the IF assembly on the center subchassis.
2. Remove Microwave Assembly A8 per paragraph
4. Disconnect all wires, noting and tagging hook-up
locations.
5-92
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