AM-2060(*)/GRC, ANT. FREQ. CONTROL Switch S2, Removal and Replacement

TM 11-5820-498-35

Figure 3-10. AM-2060( * )/GRC, access plate and gasket.

(4) Replace the Mounting screws and nylon

strap.

c. Testing Voice Coil Polarity. When a 4.5

1.5 volt dc potential is connected to the voice

coil terminals, with the positive polarity applied

to the terminal next to the red mark, the voice

coil shall move in a direction away from the mag

net.

315.

AM-2060(*)/GRC, ANT. FREQ.

CONTROL Switch S2, Removal and

Replacement

(fig. 3-12 and 3-16)

a. Removal.

( 1 ) Remove the access plate from the top of

the AM- 2060(*)/(GRC.

( 2 ) Set the ANT. FREQ. CONTROL to

Figure 3-9. AM-2060 ( * )/GRC, plug-in assembly, test

3033 position.

points with voltage and resistance indications.

(3) Remove the knob retaining screw (A, fig.

voice coil terminals. Tag the leads (VC1 or VC2)

3-16). Remove the switch knob from the switch

to insure correct replacement. Remove LS1. See c

shaft.

below for testing the polarity of the loudspeaker

(4) Remove the nut that secures the switch

magnet.

to the front panel.

b. Replacement.

(5) Slide switch S2 back into the compart-

(1) Place the loudspeaker cover on a new

ment. Do not exert too much force or push the

LS1 by holding LS1 firmly and snapping the cover

switch back too far; the leads may break.

i n place. Check to insurc that the mounting holes

(6) Hold the replacement switch in th

in the cover align with the mounting holes in

exact position as the original switch, remove th

LS1.

connecting wires and capacitors C1 through C7

(2) Solder the leads that come from the

(fig. 3-12) from the original switch, one at a

feedthrough terminals VC1 and VC2.

time, and connect them to the corresponding con-

(3) Place LS1 in the loudspeaker cavity.

tact on the replacement switch.

Check to insure that the mounting holes in the

b. Replacement.

loudspeaker cover and LS1 align with the mount-

(1) Replace the switch shaft through the

ing holes in the front of the AM- 2060(*) /GRC.

opening in the f ront panel.

3-14