TM 55-1520-240-T18-3.2 DOPPLER/GPS NAVIGATION SYSTEM VISUAL CHECKINITIAL SETUPApplicable Configurations:AllTools:Electrical Repairer’s Tool Kit,NSN 5180-00-323-4915Materials:NoneReferences:TM 55-1520-240-23Equipment Condition:TM 55-1520-240-23:Battery DisconnectedElectrical Power OffNo. 2 Access Door (Tunnel Cover)OpenPersonnel Required:68F10 Aircraft ElectricianTASKRESULT1. Check DGNS CDU (1).2. Check GPS Alert Light Indicator (2).Loosen Dzus fasteners and check rear connectors ofDGNS CDU (1). If connectors are loose or damagedtighten or replace it as required. If wiring to connectoris loose or damaged, tighten, repair, or replace it asrequired. If display screen is damaged in any wayreplace CDU (1). If knobs are loose or broken tightenor replace as required. If pushbuttons are damagedreplace CDU (1). Reinstall CDU (1) in the cantedconsole tightening the Dzus fasteners.If indicator (2) is loose or damaged tighten or replaceas 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 ConverterCV-3338A/ASN-128B (SDC) (6).If switch or cover (3) is loose or damaged tighten orreplace as required. If wiring to switch is loose orbroken tighten, repair, or replace as required.If indicator lens (4) is damaged replace.If breakers (5) are loose or damaged tighten or replaceas required. If wiring to breaker is loose or brokentighten, repair, or replace as required.If SDC (6) is loose or damaged tighten or replace asrequired. If connectors to the SDC are loose or dam-aged tighten or replace as required. If wiring or cablesto SDC are loose or damaged tighten, repair, orreplace as required.18-3.2TASKRESULT7. Check GPS Data Loader Receptacle (7).If receptacle (7) is loose or damaged tighten or replaceas required. If pushbutton is loose or damaged re-place Data Loader Receptacle. If the connector to thereceptacle is loose or damaged tighten or replace asrequired 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 replaceas required. If cable (9) to antenna is loose or brokentighten or replace as required. DO NOT REPAIRTHIS CABLE.FOLLOW-ON MAINTENANCE:Close No. 2 Access Door (Tunnel Cover)GO TO NEXT PAGEChange 1918-67
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