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OPERATIONAL CHECK. Continued - TM-11-5820-890-30-5_53
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TM-11-5820-890-30-5 Ground Non-Icom Radio Sets Consisting of: Receiver-Transmitter Radio RT-1439/VRC (NSN 5896-01-195-0827) Manual
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OPERATIONAL CHECK. Continued - TM-11-5820-890-30-5_55


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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