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CHAPTER   2 OPERATOR  INSTRUCTIONS
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TM-11-5821-333-12 Non-ICOM Airborne Radio AN/ARC-201(V) ICOM Airborne Radio AN/ARC-201A(V) Manual
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 RT/RCU   CONTROLS,   INDICATORS,   AND   CONNECTORS.   Continued - TM-11-5821-333-12_32


TM   11-5821-333-12 2-3.  RT  SELF-TEST.  Continued place of the letter “E.” The next display is "88888.” This lets you check that all display segments do light. While the five 8’s are being displayed, the control panel (local) or the control unit (remote) tests its circuits and the link to  the  RT,  Then  the  RT  checks  its  programming,  holding  memory,  and  receive  circuitry.  The  receive  path  is checked  at  eight  frequencies  in  SC  mode  and  two  frequencies  in  FH  mode.  The  ECCM  module  performs  a separate  self-test  at  this  time.  If  the  RT  passes  all  checks,   “Good”  is  displayed.  If  "FAIL1"  is  displayed,  a  fault was found in the RT circuitry or programming. If "FAIL3" is displayed, a fault was found in the ECCM module, If "FAIL7" is displayed, the interface between RCU and RT or local control panel and RT is bad. "FAIL8" indicates failure  of  the  control  unit  or  control  panel. 2-4. RT Z-A CHECK. When the FUNCTION switch is set to Z-A, the RT checks memory as well as erasing it. "Good" will be displayed if it  passes  the  check.   "FAIL1"  or  "FAIL3"  indicates  a  failure  in  the  RT. 2-5. RT TRANSMIT CHECK. Loss  of  sidetone  in  the  headset  may  mean  a  transmitter  failure.  Amplifier-oscillator  heat  sink  temperature  is monitored. If it goes above 105°C, output power is reduced. Sidetone is disabled if RF output power drops below about  4  watts,  either  from  high  voltage  standing  wave  ratio  (VSWR)  or  high  temperature. 2-6. RT LOAD CHECKS. When fill data is loaded in the RT for FH operation, the RT checks the parity of the fill data. If not correct, "bAd" is displayed. 2-7. DATA RATE ADAPTER CHECKS. The DRA does self-test checks when its input power is applied. Upon failure, a continuous 1200-HZ tone is sent to the intercom headset. If good, a beep is heard. The 1200-Hz tone may be stopped by pushing the headset PTT. 2-8. IFM POWER AMPLIFIER. Partial  or  total  loss  of  power  in  the  power  amplifier  causes  sidetone  to  be  disabled  when  transmitting. 2-9. ECCM FILL DEVICE CHECK. The CHECK indicator on the ECCM fill device is used to check for fill data. With the function switch at OFF and the select  switch  to  a  position  with  fill  data,  the  CHECK  light  will  blink  when  the  initiate  switch  is  pressed. Section  Il.  DESCRIPTION  AND  USE  OF  OPERATOR’S  CONTROLS, INDICATORS,  AND  CONNECTORS Subject Para Page ECCM Fill Device Controls, Indicators, and Connectors . . . . . . . . . . . . . . . . . 2-11 2-8 RT/RCU Controls, Indicators, and Connectors . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 2-2 2-10.  RT/RCU  CONTROLS,  INDICATORS,  AND  CONNECTORS. Below are illustrations of units used in the SINCGARS radio sets showing the location of controls, indicators, and  connectors.  There  are  some  differences  that  should  be  noted. Non-lCOM  compared  to  ICOM Different  names  on  some  of  the  keyboard  keys.   FUNCTION switches are different. The Non–lCOM FUNCTION switch has a setting of LD-V, the ICOM does  not.  This  results  in  switch  position  locations  varying  between  Non-lCOM  and  ICOM  versions. Receiver-Transmitter  to  Radio  Set  Control No  FILL  connector  on  Radio  Set  Control IFM  RF  PWR  switch  on  upper  left  of  RT,  upper  right  of  Radio  Set  Control IFM  RF  PWR  switch  setting  positions  are  different Keyboard  centered  on  Radio  Set  Control MODE  switch  moved  up  on  Radio  Set  Control MODE  switch  setting  positions  are  different Volume  (VOL)  switch  moved  to  right  side  on  Radio  Set  Control 2-2


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