TM 10-6640-238-13 4-120 4-49.    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, It em 2) Materials/Parts Required Lockwashers, (12) Personnel Required Two (2) 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 4-45. a. Unplug laboratory oven (1) power cord from wall receptacle. b. Open drawer G1, H1, or J1 and remove 12 screws (2), washers (3), lockwashers (4), and nuts (5) securing support brackets (6) to countertop.  Discard lockwashers. WARNING Two people are required to remove laboratory oven because of its weight.  Failure to comply with this warning could result in serious injury to personnel or damage to equipment. c. Remove laboratory oven (1) from countertop. d. Remove 12 screws (7) and two support brackets (6) from laboratory oven (1). INSTALL Install Laboratory Ovens.  See Figure 4-45. a. If necessary, using support bracket (6) as template, scribe and drill holes in laboratory oven (1). b. Install two support brackets (6) to laboratory oven (1) and secure with 12 screws (7). c. Place laboratory oven (1) with support brackets (6) onto countertop, and secure with 12 screws (2), washers (3), lockwashers (4), and nuts (5). d. Plug power cord into convenience outlet and run operational test. NOTE For component removal refer to commercial manual. CALIBRATE Refer to vendor manual for laboratory oven calibration procedures.