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OPERATIONAL CHECK.  Continued - TM-11-5820-890-30-5_860
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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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TROUBLESHOOTING (cont) - TM-11-5820-890-30-5_862


TM 11-5820-890-30-5 17-9. OPERATIONAL CHECK.  Continued Step 2. VOLUME CONTROL CHECK.  Continued Action e.  Set  CAL:  FCTN  GEN. FREQ: 3 kHz (2700 to 3300 Hz) LEVEL:  3.4  V  p-p  (3.2  to  3.6  V  p-p). Set  FCTN:  SINE. Set   CAL:   OFF. Read scope. f.   Set   PTT:   UUT. g.  Set  PTT:  OFF. h.  Push  speaker  VOL  control  in. i.  Set  CAL:  FCTN  GEN. FREQ: 1000 Hz (900 to 1100 Hz) LEVEL:  4  mV  p-p  (3  to  5  mV  p-p). Set  FCTN:  SINE. Set   CAL:   OFF. Set  LOAD:  OFF. Set  STIMULUS:  1. Set  RESPONSE:  3. Set  RESP  SEL:  S2. Read  scope. j.   Set   CAL:   FCTN   GEN. FREQ: 400 Hz (360 to 440 Hz) LEVEL:  4  mV  p-p  (3  to  5  mV  p-p). Set  FCTN:  SINE. Set   CAL:   OFF. Read scope. k.  Set  CAL:  FCTN  GEN. FREQ: 3 kHz (2700 to 3300 Hz) LEVEL:  4  mV  p-p  (3  to  5  mV  p-p). Set  FCTN:  SINE. Set   CAL:   OFF. Read scope. l.   Operational   Check   is   complete. Response e.  A  3-kHz  tone  is  heard  over  speaker. If  not,  go  to  chart  7. Scope CH1 displays a 3-kHz sine wave at  same  amplitude  as  in  step  c. If  not,  the  rear  cover  assembly  is  bad. f.  A  3-kHz  tone  is  NOT  heard  over speaker.  If  it  is,  go  to  chart  8. g.  No  response. h.  A  3-kHz  tone  is  NOT  heard  over speaker.  If  it  is,  go  to  chart  9. i.  Scope  CH1  displays  a  200  to 800  mV  p-p,  1-kHz  sine  wave. If  not,  go  to  chart  10. j.   Scope   CH1   displays   a   200   to 800  mV  p-p,  400-Hz  sine  wave. If  not,  the  rear  cover  assembly  is  bad. k.  Scope  CH1  displays  a  200  to 800  mV  p-p,  3-kHz  sine  wave. If  not,  the  rear  cover  assembly  is  bad. 17-6


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