TM 10-6640-239-13 4-106 4-45.    LABORATORY OVEN. This task consists of: a. Remove b. Install c. Calibrate INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Portable Electric Drill (Appendix B, Section III, Item 2) ) Twist Drill Set, (Appendix, B, Section III, Item 2) Materials/Parts Required Lockwashers, (10) 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 Laboratory Oven.  See Figure 4-39. a. Unplug laboratory oven (1) power cord from wall receptacle. b. Open drawer H1 and remove ten screws (2), washers (3), lockwashers (4), and nuts (5) securing support brackets (6) to countertop.  Discard lockwashers. c. Remove laboratory oven (1) from countertop. d. Remove ten screws (7) and two support brackets (6) from laboratory oven (1). INSTALL Install Laboratory Oven.  See Figure 4-39. a. If necessary, using support bracket (6) as template, scribe and drill holes in laboratory oven (1). b. Install ten screws (7) securing two support brackets (6) to laboratory oven (1). c. Place laboratory oven (1) with support brackets (6) attached on countertop, and secure with ten screws (2), washers (3), lockwashers (4), and nuts (5). d. Plug power cord into convenience outlet and run operational test. CALIBRATE Refer to vendor manual for laboratory oven calibration procedures.