e. Lift the handset off-hook and speak into the microphone. Listen for the sidetone level. Your
voice sidetone (if any) should be lower than the level before. Press each of the 16 keys on the keysender
pad. The sound level (if any) should be louder than the level you heard before. Place the handset on-
hook. Depress the binding posts and remove the resistors.
31. Preparation for desk use. Loosen the carrying sling by moving the slide buckles. Unhook the strap
and place the sling out of the way. Unsnap the tie-down strap. Adjust its length with the slide buckle so
the strap can reach under the case. Place the strap under the case and snap it into place. Lift the handset
and place the handset retaining spring in the latched position. Squeeze the sides of the spring and move
it back behind the two tabs. Release the pressure to keep the spring latched behind the two tabs. When
latched, the spring cannot hold the handset. (See Figure 1-19.) Place the handset on-hook.
Figure 1-19. Spring latched.
32. Preparation for vertical mounting of the telephone set. Loosen and lengthen the carrying sling.
Loosen and unsnap the handset tie-down strap. Lift up the handset off-hook. Place it under the
telephone set and snap it into place. Check the handset retaining spring to ensure it is in the unlatched
position. It should be forward past the tabs. (See Figure 1-20.) Use the carrying sling to secure the
telephone set to a pole or tree. Place handset on hook.
a. SB-3614. Set the RING VOLUME control to midrange. Make sure the MODE SELECT
switch is set to 2-WIRE DC/CB. Life the handset off-hook and listen for the dial tone. Then dial 0.
You should hear a switchboard ringback tone that pulses every two seconds. When the operator
answers, ask for a ringback. Hang up the handset. When the phone rings, adjust the VOLUME control
and then talk to the operator to ensure proper operation.