OPERATIONAL PERFORMANCE TEST PROCEDURE (Cont)

TM 11-5805-451-15

TABLE 5-3. OPERATIONAL PERFORMANCE TEST PROCEDURE (Cont)

PROBABLE

CAUSE OF

NORMAL

OPERATION

TEST

TROUBLE

INDICATION

LEVEL CHECKS 2 AND 3 DIRECTION (Cont)

c. Remove oscillator and

reterminate TB1-5, 6.

(Cont)

NOTE

Perform following steps

for 3 direction only.

a. Remove termination and

apply l&Hz test tone at

-5 dBm to TB1-9 & 10.

Faulty hybrid Al

-20 dBm

b. Measure level at TB3-1

& 2.

c. Remove oscillator and re-

terminate TB1-9 & 10.

NOISE TESTS - 2 AND 3 DIRECTION

NOTE

These tests are to be performed only if

amplifier AR1 is used in the circuit under

test. Noise tests are performed on the

amplifiers only if excessive noise is

suspected, or after an amplifier has been

repaired.

a. Remove hybrid Al

from its socket (52) and

set it aside.

b. Remove amplifier board

AR1 from its socket and

insert it into 53 (normal

position of amplifier board

AR2).

5-6