18-4.2 HF  LIAISON  FACILITY  VISUAL  CHECK 18-4.2 TM  55-1520-240-T INITIAL SETUP Applicable    Configurations: All Tools: Electrical  Repairer’s  Tool  Kit, NSN  5180-00-323-4915 Materials: None References: TM   55-1520-240-23 Equipment    Condition: TM    55-1520-240-23: Battery   Disconnected Electrical  Power  Off Avionics  Equipment  Rack  Cover  -  Cabin Off Personnel    Required: 68F10   Aircraft   Electrician TASK RESULT 1.  Check  HF  Control  (1). Loosen  Dzus  fasteners  and  check  connector of  HF  Control  (1).  If  connector  is  loose  or damaged  tighten  or  replace  it  as  required.  If wiring  to  connector  is  loose  or  damaged, tighten,  repair,  or  replace  it  as  required.  If display  screen  is  damaged  in  any  way  replace HF  Control  (1).  If  knobs  are  loose  or  broken tighten  or  replace  as  required.  If  pushbuttons are  damaged  replace  HF  Control  (1).  Reinstall HF  Control  (1)  in  center  console  tightening  the Dzus  fasteners. 2.  Check  KY-100  Control  (2). Loosen  Dzus  fasteners  and  check  connector of  KY-100  Control  (2).  If  connector  is  loose or  damaged  tighten  or  replace  it  as  required. If  wiring  to  connector  is  loose  or  damaged, tighten,  repair,  or  replace  it  as  required.  If display  screen  is  damaged  in  any  way  replace KY-100  Control  (2).  If  knobs  are  loose  or broken  tighten  or  replace  as  required.  If pushbuttons  are  damaged  replace  KY-100 Control  (2).  Reinstall  KY-100  Control  (2)  in center  console  tightening  the  Dzus  fasteners. 3.  Check  HF  and  KY-100  HF  COMM  Circuit Breakers (3). If breaker(s) (3) are loose or damaged tighten or  replace  as  required.  If  wiring  to  breaker(s) are  loose  or  broken  tighten,  repair,  or  replace as  required. TASK 4.  Check  HF  Receiver-Transmitter RT-1749(URC)  (4). RESULT If  receiver  (4)  is  loose  or  damaged  tighten  or replace  as  required.  If  connectors  to  the receiver are loose or damaged tighten or replace  as  required.  If  wiring  or  cables  to receiver  are  loose  or  damaged  tighten,  repair, or  replace  as  required. 5. Check  TSEC/KY-100  Processor  (5). Loosen  Dzus  fasteners  and  check  connector of  KY-100  Processor  (5).  If  connector  is loose or damaged tighten or replace it as required.  If  wiring  to  connector  is  loose  or damaged,  tighten,  repair,  or  replace  it  as required.  If  display  screen  is  damaged  in  any way  replace  KY-100  Processor  (5).  If  knobs are loose or broken tighten or replace as required.  If  pushbuttons  are  damaged  replace KY-100  Processor  (5).  Reinstall  KY-100 Processor (5) in bracket under shelf number 2 tightening  the  Dzus  fasteners. 6. Check  HF  Receiver/Transmitter  Battery If  Battery  Box  (6)  is  loose  or  damaged  tighten Box,   CY-8515/ARC-201   (6). or  replace  as  required.  If  connector  (7)  is loose or damaged tighten or replace as required.  If  wiring  to  the  connector  is  loose or damaged tighten, repair, or replace as required. 7. Check  Power  Amplifier-Coupler AM-7531/URC  (9). If Amplifier-Coupler (9) is loose or damaged tighten  or  replace  as  required.  If  connectors to  the  amplifier  are  loose  or  damaged  tighten or  replace  as  required.  If  cables  to  Amplifier- Coupler  J9724,  J9721  and  J9726  are  loose or damaged tighten, repair, or replace as required.  If  cable  to  J9725  is  loose  tighten,  if damaged replace ONLY, DO NOT REPAIR THIS CABLE GOING TO ANTENNA. FOLLOW-ON   MAINTENANCE: Replace  Avionics  Equipment  Rack  Cover  -  Cabin. GO  TO  THE  NEXT  PAGE Change 21 18-101