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DOPPLER/GPS   NAVIGATION   SYSTEM   WIRING   DIAGRAM   (Continued) - TM-55-1520-240-T-3_1136
DOPPLER/GPS   NAVIGATION   SYSTEM   VISUAL   CHECK   (Continued) - TM-55-1520-240-T-3_1138

TM-55-1520-240-T-3 CH-47D Heilcopter Manual
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TM   55-1520-240-T 18-3.2    DOPPLER/GPS    NAVIGATION    SYSTEM    VISUAL    CHECK 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 No. 2 Access Door (Tunnel Cover) Open Personnel   Required: 68F10  Aircraft  Electrician TASK RESULT 1.  Check  DGNS  CDU  (1). 2.  Check  GPS  Alert  Light  Indicator  (2). Loosen  Dzus  fasteners  and  check  rear  connectors  of DGNS  CDU  (1).  If  connectors  are  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 CDU (1). If knobs are loose or broken tighten or  replace  as  required.  If  pushbuttons  are  damaged replace CDU (1). Reinstall CDU (1) in the canted console  tightening  the  Dzus  fasteners. If indicator (2) is loose or damaged tighten or replace as required. 3.  Check  GPS  Zeroize  Switch/Cover  (3). 4.  Check  GPS/DOP  SEL  Indicator  (4). 5.  Check  DOPPLER  Circuit  Breakers  (5). 6.  Check  RADAR  Signal  Data  Converter CV-3338A/ASN-128B   (SDC)   (6). If switch or cover (3) is loose or damaged tighten or replace as required. If wiring to switch is loose or broken tighten, repair, or replace as required. If indicator lens (4) is damaged replace. If breakers (5) are loose or damaged tighten or replace as required. If wiring to breaker is loose or broken tighten, repair, or replace as required. If SDC (6) is loose or damaged tighten or replace as required. If connectors to the SDC are loose or dam- aged tighten or replace as required. If wiring or cables to SDC are loose or damaged tighten, repair, or replace as required. 18-3.2 TASK RESULT 7.  Check  GPS  Data  Loader  Receptacle  (7). If receptacle (7) is loose or damaged tighten or replace as  required.  If  pushbutton  is  loose  or  damaged  re- place  Data  Loader  Receptacle.  If  the  connector  to  the receptacle is loose or damaged tighten or replace as required If wiring to the connector is loose or dam- aged tighten, repair, or replace as required. 8.  Check  GPS  Antenna  (8). If antenna (8) is loose or damaged tighten or replace as required. If cable (9) to antenna is loose or broken tighten  or  replace  as  required.  DO  NOT  REPAIR THIS  CABLE. FOLLOW-ON   MAINTENANCE: Close No. 2 Access Door (Tunnel Cover) GO  TO  NEXT  PAGE Change   19 18-67







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