TM 10-6640-215-13 4-24.  REMOVE/REPLACE BLACKOUT MICROSWITCH -continued. b. Position microswitch in place and install switch mounting screws. c. Install cover plate and NSN plates, using screws and flatwashers. d. Open appropriate circuit breaker and verify proper operation. ADJUSTMENT Adjust Blackout Microswitch. a. Verify that switch is activated when semi-trailer van door is closed.  If not, proceed to step b. b. Rotate plunger adjustable nut until closing semi-trailer van door activates switch. 4-25.  REMOVE/INSTALL RECEPTACLES. This task covers: a. Removal b.  Installation INITIAL SET-UP: Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 2) General Safety Instructions WARNING ELECTRICAL SHOCK Before     performing     any     maintenance     actions     on     electrical equipment, ensure all electrical power has been turned off.  Death or serious injury may occur from failure to do this. REMOVAL Remove Receptacle.  See figure 4-14. a. Open appropriate circuit breaker located in the power panel. b. Verify no electrical power to the receptacle. c. Remove receptacle cover plate screw(s) and remove cover plate. d. Remove two mounting screws and withdraw defective receptacle to gain access to wires. e. Tag for reconnection and disconnect electrical leads. f. Remove defective receptacle. 4-56