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    TM 10-3930-664-24 2-63. BLACKOUT/SERVICE LIGHT SWITCH (MASTER SWITCH) REPLACEMENT This task covers:  Removal, cleaning, Inspection, and Installation INITIAL SETUP: Tools and Test Equipment: Equipment Condition: General Mechanics Tool Kit (1, App.  E) Batteries disconnected (para.  2-78) A. REMOVAL WARNING Electrical shock hazard.    Disconnect  battery  ground cable or power source prior to working on electrical components.    Failure  to  heed  warning  could  cause shock,  injury  or  death.    If  electrical  shock  occurs, administer   first   aid   and   seek   medical   assistance immediately. 1. Tag and disconnect electrical wiring from blackout/service light switch (1). 2. Remove    three    handles    from    blackout/service light switch (I) by removing screws (2). Handles must be removed to allow switch removal. 3. Remove   blackout/service   light   switch   (1)   from instrument panel (4) by removing screws (3). B. CLEANING Clean   blackout/service      light      switch      in  accordance with paragraph 1-24. C. INSPECTION Inspect light switch and related components in accordance with paragraph 1-24. 2-190

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