TM 10-6640-239-13 4-48 4-22.    WALL SWITCH. This task consists of: a. Remove b. Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) General Safety Instructions WARNING ELECTRICAL SHOCK Before  performing  any  maintenance  actions  on  electrical  equipment,  ensure  all electrical power has been turned off.  Failure to comply with this warning may result in serious injury or death. REMOVE Remove Wall Switch.  See Figure 4-12. a. Position Main Power Panel or Power Panel No. 2 appropriate circuit breaker(s) to OFF. (See Chapter 2, Section 1, Table 2-2 and Table 2-3). b. Turn switch to on position and verify no electrical power to switch. c. Remove six screws (1) cover (2), and extension (3). d. Remove two screws (4) and withdraw switch (5) from junction box (6) to gain access to wire. e. Tag and disconnect wires by loosening screws (7) and remove switch (5). INSTALL Install Wall Switch.  See Figure 4-12. a. Connect wires as tagged to switch (5), tighten screws (7), and remove tags. b. Install switch (5) into junction box (6). Ensure wires are not kinked or strained. c. Secure switch (5) with two screws (4). d. Install extension (3) and cover plate (2) on junction box (6) and secure with six screws (1). e. Position Main Power Panel or Power Panel No. 2 appropriate circuit breaker(s) to ON. f. Turn switch to on position and verify proper operation.