Section VI
Paragraphs 6-24 to 6-25
so that the pick-up loop will not protrude from the
final r-f amplifier coil housing and the mounting
end of the tube and sustain possible damage during
bushing.
removal.
f. Slide the attenuator tube out of the collar and then
d. Remove the bottom cover of the r-f chassis.
carefully rotate the tube in the bushing, so that the
shaft end of the assembly will clear components when
e. Loosen the set screws (6, 7, 8, figure 6-10)
withdrawn. The nuts securing two resistor stacks
that secure the attenuator tube in the collar on the
may have to be loosened to gain clearance.
g. Carefully slide attenuator out of the bushing. Dis-
connect attenuator cable from coaxial relay. Remove
the UG-88/U connector from the cable.
h. When replacing the attenuator, reverse the above
procedure and slide the attenuator tube through the
bushing and into the collar until the panel shaft and
attenuator shaft are in exact alignment.
i. Upon completing the replacement recalibrate the
attenuator (paragraph 6-40).
j. If the MICROVOLTS dial does not operate smoothly
the panel shaft and attenuator shaft have not been ac-
curately aligned. Loosen set screws on collar and
align shafts properly, keeping the MICROVOLTS dial
at some intermediate setting to prevent damage to the
p i c k - u p loop while adjusting the attenuator tube
position.
TANK ASSEMBLIES, T1501, T1502, AND
Z1501.
a. Unsolder and label the four leads entering the as-
sembly.
b. Remove the two mounting screws accessible from
the slug rack side.
c. Gently pull the assembly straight out, taking care
not to damage the slugs as they are withdrawn from
Oscillator Switch Adjustment
the assembly.
