Initial Check and Adjustment of Equipment

TM 11-5830-255-14

(1) At the Remote intercom under test

check that 48V is supplied to terminals 1 and

2 of TBS.

Depress remote intercom intercom

and then MON B button, and

(2) Set VOLUME at halfway position. Set

channels can be monitored. The

LISTEN-TALK switch to LISTEN, press and

will not illuminate but will stay in until re-

release REL button, set power OFF-ON toggle

leased. Press REL button to release any of the

switch to ON and check that the panel fuse does

pushbuttons.

not indicate as blown.

(3) Depress OPER A pushbutton and RING

(8) If satisfactory TALK or LISTEN op-

eration is not obtained, the gain of the ampli-

pushbutton. Note that OPER A pushbutton il-

fiers must be readjusted or the defective ampli-

luminates and that audible alarm operates.

fier must be replaced.

(43 Depress REL pushbutton and note that

OPER A pushbutton light is estinguished and

(9) `On the central intercom set LISTEN-

the button returns to its normal position.

TALK switch to TALK, depress channels 1

through 20 pushbuttons and request the asso-

(6) Repeat steps 3 and 4

substituting chan-

ciated remote unit to speak. Set TALK switch

nel B (OPER B) instead of

A. The OPER B

to LISTEN and check that a reply can be heard.

button should illuminate, and

the alarm should

Adjust VOLUME control for a satisfactory vol-

indicate when the RING button

is pressed.

ume. Repeat this step for the associated station.

(6) Depress LISTEN-TALK switch to

(10) If satisfactory TALK or LISTEN oper-

TALK position and also depress OPER A, or

ation is not obtained the gain of amplifiers 1,

OPER B, button and request central intercom

2, or 3 must be adjusted, or the defective am-

to speak. release LISTEN-TALK switch and

plifier must be replaced.

check that a reply is heard in LISTEN position.

2-6