TM 11-6625-3053-14
h. Gently push the new DS1 back through the front panel. At the same time, force the flat spring nut onto body
of new DS1 until it is touching rear of panel as the DS1 seats against front of panel.
i.
Replace instrument dust cover (para 6-20).
6-25.
REPLACEMENT OF B1.
REMOVAL
a. Remove equipment dust cover (para 6-20).
b. Separate rear panel from instrument by performing removal procedure, stage 1 (para 6-21).
c.
Remove the 4 phillips head screws on the outside of the rear panel holding the filter cover and filter, and
attaching the blower assembly to the inside of the rear panel. Save the screws.
d. Unsolder the two leads from the blower and remove the blower. Note direction fan points.
e. On the old blower, remove the screws and lock washers holding the hexagonal spacers on each of the four
corners.
f.
Remount the hexagonal spacers on each corner of the new blower, using the original hardware from step e.
g. Resolder the leads to the terminals of the new blower, the white lead on top.
h. Use original screws from step c above to replace the filter and cover on the outside of the rear panel and the
new blower on the inside of the rear panel. Insure that blower is facing properly to provide adequate
ventilation.
i.
Replace the rear panel (reverse of step b. above).
j.
Replace the dust cover (reserve of step a. above).
6-26.
REPLACEMENT OF RK837 KLYSTRON TUBE A4V1.
REMOVAL
WARNING
Do not attempt to remove or replace the klystron tube with the instrument
energized. Disconnect the power cord from the instrument before
beginning.
a. Remove instrument dust cover (para 6-20).
b. Allow instrument to remain in a de-energized condition for at least 15 minutes before removing the klystron
tube.
c.
Loosen clamp holding klystron cover to oscillator barrel. Gently work cover off knurled nut toward rear panel
and remove the klystron socket from the tube.
d. Loose knurled klystron nut with adjustable pliers to a point where you can turn it by hand. Remove klystron
nut.
e. Pull klystron tube out gently, screwing it clockwise as you do. Keep old tube in a safe place.
f.
Remove the spacer and cylindrical spring.
6-88