TM 11-5821-333-30
6-20. OPERATIONAL CHECK. Continued
ACTION
RESPONSE
Step 16. INTERCOMMUNICATIONS SYSTEM XMT AUDIO TEST
Presets:
SET ICS–
SET TEST ADAPTER–
SET FUNCTION GENERATOR–
1:ON
S1:3
FUNCTION: SINE
SELECTOR: 1
S3: OFF
FREQ: 1 kHz
AUX: OFF
TEST EQPT INPUT
(900 to 1100 Hz)
NAV: OFF
(S14) : EXT
LEVEL: 100 mVP-P
HOT MIKE: OFF
TEST EQUIPMENT
(90 to 110 mV P-P)
VOL: FULLY CW
SELECTOR (S15) : SCOPE
CONNECT:
TEST CABLE W14 FROM FUNCTION GENERATOR OUTPUT TO J9.
Use ext probe to check J1 -K while holding
Scope channel 1 displays sine wave:
PTT switch (S8) at REF.
1 kHz (900 to 1100 Hz)
greater than 8 V P-P level
If not, go to chart 14.
Step 17. INTERCOM SELECTOR RCV AUDIO TEST
Presets:
SET TEST ADAPTER–
SET FUNCTION GENERATOR–
TEST EQUIPMENT
FUNCTION: SINE
SELECTOR (S15) : ICS
FREQ: 1 kHz (900 to 1100 Hz)
LEVEL: 5 V P-P (4.5 to 5.5 V P-P)
REMOVE: EXT PROBE AND TEST CABLE W14.
CONNECT: -FUNCTION GENERATOR OUTPUT TO J8
-SCOPE PROBE TO SCOPE CHANNEL 1 INPUT (GND PROBE TO TP24)
Use scope probe to check J9-D.
Scope channel 1 displays sine wave:
1 kHz (900 to 1100 Hz)
5 v P-P (4.5 to 5.5 v P-P)
If not, go to chart 16.
6-176
