e. Coupler Removal.
( 4 ) Replace the indicator jewel and ro-
tate it clockwise.
(1) Remove 14 screws that secure an-
b. Replacement of Knobs,
( 2 ) Slide antenna coupler from antenna
(1) Set the control switch to its extreme
counterclockwise position or to a known refer-
( 3 ) Remove rubber gasket from antenna
(2) Loosen the two setscrews on the de-
( 4 ) Remove spring from top of vacuum
f e c t i v e knob and remove the knob from the
v a r i a b l e capacitor.
( 3 ) Replace the new knob on the shaft
f. Servoamplifier Circuit Board Al Cover
a n d align the pointer to the correct position.
R e m o v a l (on Coupler).
(4) Tighten the two setscrews on the
t h a t secure servoamplifier circuit board Al
c. Replacement of Fuses.
(1) Press in on the fuseholder cap and
Note. The two screws that pass through the
c a s t i n g are slightly longer.
rotate it counterclockwise to unlock it.
(2) Remove cover by sliding it up.
of the fuseholder.
g. Limit Switch Adjustment (on Coupler),
( 3 ) Remove the defective fuse from the
(1) Adjustment of limit switch S1 is
m a d e by adjusting the arm of the switch. If
(4) Replace the defective fuse with a new
S1 is switched before the limit is reached or
o n e with the same rating.
not at all, bend the actuator arm of the switch
(5) Insert the fuse and fuseholder cap in
very slightly so that the switching takes place
a t the limit, not before or after the limit is
and rotate it clockwise to lock it.
d. Adjustment of Microammeter.
(2) Adjustment of limit switch S2 is
(1) Remove all power from Test Set,
made by adjusting the position of the switch.
Antenna AN/ARM-115 or set the METER
If S2 is switched before the limit is reached or
F U N C T I O N switch to OFF.
not at all, loosen the two screws securing the
switch and slide the switch up or down until
( 2 ) Mechanically align the needle indi-
the switching takes place at the limit, not be-
cation at zero by turning the adjustment screw
fore or after the limit is reached. Tighten the
on the microammeter face either clockwise or
screws and recheck limit switch.