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OPERATIONAL CHECK. Continued - TM-11-5820-890-30-5_332
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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_334


TM 11-5820-890-30-5 4-9. OPERATIONAL  CHECK.  Continued Step 3. AUDIO AMPLIFIER CHECK FOR AM-7239/VRC AND AM-7239B/VRC.  Continued Action Response n.  Set  PTT:  UUT.  Read  scope. o.  Set  PTT:  OFF. p.  Disconnect  cable  at  J2  and  move  it  to  J4. q.  Set  PTT:  UUT.  Read  scope. r.   Set   PTT:   OFF. s.  Set  LOGIC:  2.  Read  scope. t.  Remove  X10  probe  and  mini  probe  tip adapter  from  test  adapter  SCOPE  1. Remove  X10  probe  from  SCOPE  CH  A. Connect  cable  from  test  adapter  SCOPE  1 to  SCOPE  CH  A.  Disconnect  cable  at  J4 and  move  it  to  J5. Set  CAL:  FCTN  GEN: FREQ: 1800 Hz (1750 to 1850 Hz) LEVEL:  300  mV  p-p (250  to  350  mV  p-p) FCTN: SINE. Set  CAL:  MOD  GEN: FREQ: 600 Hz (550 to 650 Hz) MOD  AMPLITUDE:  MID-RANGE MOD FCTN : SINE MODULATION: FM: INT. Set   CAL:   OFF. Set   STIMULUS:   1. Set LOAD: 2. Set LOGIC: 4. Set TEST EQPT SELECTOR: SCOPE. Set RESPONSE: 6 Set  RESP  SEL:  S1. Set STIM SEL: HANDSET. Read scope. u.  Set  PTT:  UUT.  Read  scope. v.  Set  PTT:  OFF. w.  Set  STIM  SEL:  FCTN  GEN. Set  PIT:  UUT.  Read  scope. x.  Set  PTT:  OFF. n.  Scope  reading  is  less  than  0.5  V  p-p.  If not,  go  to  chart  15. o.  No  response. p.  No  response. q.  Same  response  as  for  step  3  n.  If  not,  the wire  from  5A3J2-C  to  5A3J4-C,  or  connec- tor  5A3J4,  is  bad. r.   No   response. s.  Scope  reading  is  less  than  0.5  V  p-p.  If not,  go  to  chart  16. t.  Scope  reading  is  -0.2  to  0.2  V  dc.  If  not, the  audio  amplifier  (5A2)  is  bad. u.  Scope  reading  is  0.8  to  1.3  V  dc  when PTT:  UUT,  then  -0.2  to  0.2  V  dc  within 1  second.  If  no  signal  is  present,  go  to chart  17.  If  a  signal  is  present  but  not correct,  the  audio  amplifier  (5A2)  is  bad. v.  No  response. w.  Scope  reading  is  0.8  to  1.3  V  dc.  If  signal is  same  as  in  step  3  u,  go  to  chart  18.  If not,  the  audio  amplifier  (5A2)  is  bad. x.  No  response. 4-10


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