TM    55-1520-240-T 18-4.3 HF  LIAISON  FACILITY  OPERATIONAL  CHECK INITIAL   SETUP Applicable    Configurations: All Tools: Electrical  Repairer’s  Tool  Kit, NSN  5180-00-323-4915 Materials: None Personnel    Required: Aircraft  Electrician  (2) References: TM   11-1520-240-23 TM  11-5821-357-12 TM  55-1520-240-10 TM  55-1520-240-23 Equipment    Condition: TM   55-1520-240-23: Battery   Connected Electrical  Power  Off Hydraulic  Power  Off HF  Liaison  Facility  Visual  Check  Performed (Task   18-4.2) TASK RESULT CHECK   CIRCUIT   BREAKERS 1.  Check  that  the  following  circuit  breakers  on No. 2 pdp (1) are closed: HF  (COMM) HF KY-100 (COMM) If  any  circuit  breaker  is  open,  close  it. 2.  Start  APU.  Refer  to  task  15-1.5. APU ON capsule shall come on. CHECK   HF   CONTROL   C-12436/UR 3. Turn aircraft CTR CSL LTG control (2) clockwise   and   counterclockwise   while checking  HF  Control  (4)  panel  lighting. 4.  Turn  HF  Control  (4)  Function  Switch  (7)  to T/R and press the HF Control (4) upper and lower  brightness  switches  (6)  while checking  the  HF  Control  (4)  Display  (8) Intensity   level. CHECK   TSEC/KY-100   CONTROL   (RCU) 5.  Turn  KY-100  Control  (5)  BRT  PNL  Knob  (21) clockwise   half-way   to   full-bright.   Turn   aircraft CTR CSL LTG control (2) clockwise and counterclockwise   while   checking   KY-100 Control (5) panel lighting. Turn CTR CSL LTG Control  (2)  so  KY-100  Control  (5)  panel lighting  is  at  a  comfortable  level.  Rotate  KY- 100  Control  (5)  BRT  PNL  Knob  (21)  clockwise and  counterclockwise  while  checking  KY  -100 Control  (5)  Display  Screen  (10)  intensity  level. HF  Control  (4)  panel  light  shall  vary  with  the changing  setting  of  the  aircraft  dimmer  control (3).  If  HF  Control  (4)  panel  light  is  not  visible  or intensity  level  does  not  vary  with  aircraft  dimmer control  (3),  go  to  task  18-4.4. HF  Control  display  screen  (8)  intensity  level  shall vary  with  the  changing  setting  of  the  brightness switches  (6).  If  no  display  appears  or  intensity level  does  not  vary,  go  to  task  18-4.5. KY-100  Control  (5)  panel  light  shall  vary  with  the changing  setting  of  the  aircraft  dimmer  control (2).  If  KY-100  Control  (5)  panel  light  is  not visible  or  intensity  level  does  not  vary  with  KY- 100 Control (5) BRT PNL Knob (21), and or if intensity  level  does  not  vary  with  aircraft  dimmer control  (3)  go  to  task  18-4.6. 6.  Turn  KY-100  Control  (5)  Mode  Switch  (9)  to OFFLINE and press the HF Control (4) upper brightness   switch   (6)   and   turn   the   KY-100 Control  (5)  BRT  DISPL  knob  (24)  clockwise and   counterclockwise   while   checking   the display  screen  (10)  intensity  level. KY-100  Control  display  screen  (10)  intensity  level shall  vary  with  the  changing  setting  of  the brightness  control  knob  (8).  If  no  display  appears or  intensity  level  does  not  vary,  go  to  task  18-4.6. CHECK   HF   RECEIVER-TRANSMITTER RT-1749/URC 7.  Turn  HF  Control  (4)  Mode  Switch  (7)  to STBY. 8.  While  still  in  STBY  mode,  depress  the  line- select  switch  (3)  which  points  to  TEST  then depress  BIT  line-select  switch  (3)  to  initiate RCV BlT. 9.  Upon  successful  completion  of  RCV  BIT  and after KEY HF FOR TRANSMIT TEST or PTT FOR XMT BIT is displayed on HF Control (4) Display (8) depress and hold headset PTT switch  to  Initiate  XMT  BlT.  Release  PTT switch. 10. While still in STBY mode, press FILL line- select  switch  (3).  Use  HF  Control  (4)  VALUE switches  (12)  to  select  DATA  In  TYPE:  field on  line  1  of  HF  Control  Display  (8). 11. While still in STBY mode, press FILL line- select  switch  (3).  Use  HF  Control  (4)  VALUE switches  (12)  to  select  KEY  In  TYPE:  field  on line  1  of  HF  Control  Display  (8). After  a  30-second  warm-up  the  HF  Control  Display (5)  shall  display  SYSTEM  TESTING  while  power-up BIT  (P-BIT)  is  in  process.  After  the  test  is complete  SYSTEM-GO  is  displayed  if  all  checked good.  If  a  fault  is  detected,  SYSTEM-NO  GO  is displayed.  Go  to  task  18-4.7  if  SYSTEM-NO  GO  is displayed. Wait  90  seconds.  Upon  successful  completion  of RCV  BIT,  RCV  BIT  GO  is  displayed.  If  any  other message  is  displayed,  go  to  task  18-4.8. Wait  90  seconds.  Upon  successful  completion  of XMT  BIT,  XMT  BIT  GO  is  displayed.  If  any  other message  is  displayed,  go  to  task  18-4.8. The  HF  Receiver-Transmitter  is  now  ready  to receive data from a Data Transfer Device (DTD). Connect  DTD  to  HF  Control  (4)  DATA  connector (13)  and  initiate  datafill  from  DTD.  LOADING  is displayed  during  datafill.  LOAD  COMPLETE  is displayed  if  datafill  is  successful.  If  LOAD  FAIL  is displayed,  go  to  task  18-4.9. The  HF  Receiver-Transmitter  is  now  ready  to receive  secure  keys  from  a  Data  Transfer  Device (DTD). Connect DTD to HF Control (4) KEY connector  (20)  and  initiate  keyfill  from  DTD. LOADING  is  displayed  during  fill.  LOAD COMPLETE  is  displayed  if  keyfill  is  successful.  If LOAD  FAIL  is  displayed,  go  to  task  18-4.9. 8-4.3 GO   TO   THE   NEXT   PAGE Change 21 18-103