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OPERATIONAL CHECK. Continued - TM-11-5820-890-30-5_334
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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_336


TM 11-5820-890-30-5 4-9. OPERATIONAL  CHECK.  Continued Step 5. REMOTE CONTROL TRANSFORMERS CHECK FOR AM-7239/VRC AND  AM-7239/VRC. Action Response a.  Set  CAL: FCTN  GEN: a.  Scope  reading  is  300  to  625  mV  p-p. MODULATION: OFF If  not,  go  to  chart  25. FREQ: 40 kHz (38 to 42 kHz) LEVEL:  500  mV  p-p (450  to  550  mV  p-p) FCTN:  SINE. Set  CAL: OFF. Set   STIMULUS:   8. Set TEST EQPT SELECTOR: SCOPE. Set   LOAD:   3. Set RESPONSE: 5.  Read  scope. b.  Disconnect  cable  at  J7  and  move  it  to  J8. b.  Scope  reading  is  300  to  625  mV  p-p. Set  RESPONSE:  4.  Read  scope. If  not,  go  to  chart  26. c.  Set  TEST  EQPT  INPUT:  EXT. c.  No  response. d.  Use  EXT  probe  to  check  voltage  from d.  Scope  reading  is  100  to  200  mV  p-p, E1A  to  E2A  (GND).  Read  scope. If  not,  go  to  chart  27. e.  Disconnect  cable  at  J8  and  move  it  to  J7. e.  No  response. f.  Use  EXT  probe  to  check  voltage  from f.  Scope  reading  is  100  to  200  mV  p-p. E2B  to  E1B  (GND).  Read  scope. If  not,  go  to  chart  28. Step 6. INTERCOM AUDIO PATH CHECK FOR AM-7239/VRC AND AM-7239B/VRC. Action Response a.  Set  STIMULUS: OFF. a.  DMM  reading  is  21.6  k  to  26.4  k  ohms. Set TEST EQPT INPUT: INT. If  DMM  reading  indicates  an  open  circuit, Disconnect  cable  at  J4  and  move  it  to  J3. go  to  chart  29.  If  not,  the  audio  amplifier Set  LOAD:  OFF. (5A2)  is  bad. Set  RESPONSE:  2. Set TEST EQPT SELECTOR: DMM. Set  RESP  SEL:  S1.  Read  DMM. b.  Disconnect  cable  at  J3  and  move  it  to  J2. b.  DMM  reading  is  21.6  k  to  26.4  k  ohms. Read  DMM. If  DMM  reading  indicates  an  open  circuit, go  to  chart  30.  If  not,  the  audio  amplifier (5A2)  is  bad. 4-12


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