ARMY TM 9-6115-670-14&P 5-60 5.22.  AUTOMATIC VOLTAGE REGULATOR. This task covers:     a. Test b. Replace INITIAL SETUP Tools General Mechanic's Tool Kit (Item 1, Appendix B) Shop Equipment, Electrical, Repair, Semitrailer Mounted (Item 3, Appendix B) 240 VAC Isolating Transformer (Item 23, Appendix B) 240 1l Transformer, Power, Autotransformer (Item 24, Appendix B) 5 Amp Fuse (Item 25, Appendix B) 2 Amp Fuse (Item 26, Appendix B) Neon Lamp (Item 27, Appendix B) Incandescent Lamp (Item 4, Appendix B) Equipment Conditions MASTER ON-OFF switch on APU control unit set to OFF. Air filter removed (para 4.45.). Materials/Parts Automatic Voltage Regulator TEST a.  Remove automatic voltage regulator (AVR) (steps a through d of "REPLACE"). b.  Set up test procedure as shown in Figure 5-16 (sheet 1), but do not apply power. c.  Turn AVR VOLTS and STABILITY controls fully ccw. d.  Ensure the autotransformer is set to minimum volts position. e.  Switch on power supply and check that neon lamp is lit. f.   Slowly turn the variable autotransformer until 5 volts AC is across AVR terminals 7 and 8. Use a separate voltmeter if necessary. WARNING Ensure that APU DC power supply is disconnected. Failure to observe this warning could result in severe injury or DEATH to personnel. WARNING Ensure that the APU is turned off and completely de- energized before opening generator housing. Failure to observe this warning could result in severe injury or DEATH to personnel.