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TM 11-5820-890-30-5
2-29. OPERATIONAL CHECK. Continued
Step 2. SELF-TEST. Continued
I
Action
Response
b.
Set TEST EQPT SELECTOR: SCOPE.
Set RESPONSE:
7.
Set UUT RT: FCTN:
REM.
c.
Press and hold UUT RT BATT/CALL
button.
Set PTT: UUT.
Release UUT RT BATT/CALL button.
d. Set PTT: OFF.
IF:
THEN:
Any SIG display
Display circuit card
segment does
assembly
not light.
(1A16A1A1) is bad.
No “E
d“ display.
Go to chart 4.
Any keyboard
Display circuit card
display segment
assembly
does not light.
(1A16A1A1) is bad.
No “rushing noise”. Go to chart 5.
Audio not correct or Go to chart 6.
“Good” not displayed.
No “BEEP”.
Go to chart 7.
Audio is low or
Go to chart sheet
distorted.
9 at node
b.
SIG display lights segments 9 through 0
in sequence, and then goes blank. If not,
the display circuit card assembly
(1A16A1A1) is bad.
Scope than A displays a 1.5 to 2.5 V
p-p, 2870 to 2890 Hz sine wave that goes
to zero after a few seconds. If not, go to
chart 9. If waveform is present, but not
sinusoidal, the two-wire interface (1A6) is
bad.
c.
“CALL” is displayed on RT. If not, go to
chart 9.
NOTE:
If RT is being checked for a remote
operations fault and has passed step 2,
repeat steps 2a through c, 7 or 8 times.
If display goes blank when PTT is set to
UUT, replace the exciter/power amplifier
(1A11) and repeat step 2. If UUT passes
step 2, the removed exciter/power
amplifier (1A11) is bad. If UUT fails, the
power supply (1A3) is bad.
d.
No response.
2-33
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