TM 11-5821-333-30
6-20. OPERATIONAL CHECK. Continued
ACTION
RESPONSE
Step 21. RF SECTION TEST
Presets:
SET REF RT–
SET TEST ADAPTER–
SET SIGNAL GENERATOR–
PRESET: 1
S1: 1
FREQ: 45 MHz
TAKE CNTL (S9) : RT
SET REF RCU–
LEVEL: -10 dBm
DC: ON
FM MODE: INT
FUNCTION: STOW
MODULATION:
1 kHz at 6 to 7 kHz deviation
LOAD: REF RT PRESET 1 WITH 45000.
SET: REF RT FUNCTION TO SQ OFF
CONNECT:
-TEST CABLE W5 FROM SIGNAL GENERATOR OUTPUT TO J3
-JUMPER W1 FROM J1O TO J11 (IF DISCONNECTED)
a. Use ext probe to check TP11.
a. Scope channel 1 displays an 8.0 V P-P (5 to
11 V P-P) sine wave. If not, go to chart 20.
b. Set test adapter switch S1 to 2.
b. No response.
c. Use ext probe to check TP11.
c. Scope channel 1 displays distorted sine wave
or noise at 8.0 V P-P (5 to 11 VP–P). If not, go
to chart 21.
d. No response.
d. Set signal generator–
FREQ: 30 MHz
LEVEL: +10 dBm
FM MODE: OFF
e. Connect X10 probe to scope channel 1. Use
probe tip adapter to connect to J12.
f.
Set test adapter–
TEST EQPT INPUT (S14) - INTL
TEST EQUIPMENT SELECT (S15) -
FREQ CNTR
g. Set signal generator–
RF OUTPUT: OFF
h. Disconnect cable W5 from J3.
i.
Use DMM to measure resistance between
J12 and J19.
e. Scope channel 1 displays a 160 to 240 mVP-P
signal. If not go to chart 22.
f.
No response.
g. No response.
h. No response.
i.
DMM reads 130 Ohms (115 to 145 Ohms), If
not, go to chart 23.
6-180
