c.   Remove. (1)  Tag  and  disconnect  harness  leads  to  voltage regulator  (39). (2)  Remove  nuts  (38)  attaching  voltage  regulator from control box (57) and remove voltage regulator. d. Test, Bench (see figure 6-4). (1) Connect ac voltage regulator to test circuit and test as shown in figure 6-4. Transformers T1 and T2 are located in the control cubicle (see figure 6-3, items 34 and 37) and may be disconnected and used for this test. (2)   Perform   the   test   and   calibration   procedures shown in figure 6-4. (3) Failure of the voltage regulator to meet the test and  calibration  requirements  indicates  the  voltage  regulator should be replaced. e.  Repair.  See  voltage  regulator  schematic  diagram, figure 6-5 or 6-5.1. (I)  Repair  of  the  voltage  regulator  is  limited  to replacing defective components. Refer to the schematic fig- ure  6-5  for  proper  values. f. Installation (see figure 6-3). NOTE When  replacing  voltage  regulator,  be  sure  to remove  jumpers  from  old  voltage  regulator. Install jumpers in the same location on the new regulator.  Failure  to  install  jumpers  correctly will result in voltge regulator failure. If diftlculty occurs in reconnecting jumpers, refer to figure 1-1orl-1.l. (1) Mount serviceable voltage regulator (39) into the control box (57) using nuts (38). (2) Reconnect previously tagged and removed har- ness to the voltage regulator terminal board. 6-7.  AC  OUTPUT  CONTROL  BOX  WIRING  HARNESS. Install and repair wiring harness by replacing wires, connec- tors, and terminal lugs as necessary. See figure 6-6 and tables 6-3,6-3.1 for all necessary wiring harness assembly. 6-8. AC OUTPUT CONTROL BOX ASSEMBLY. a.  Test,  on  Equipment. (1) Resistor R3 (20, figure 6-10) must be adjusted as  follows  before  performing  any  tests. (2)  Remove  wire  D26F16  from  TB3-1  and  con- nect 0 to 1 amp ac ammeter. Connect test ammeter as shown in figure 6-7. (3) Place reconnection switch in 1200 position. TM   5-6115-585-34 NAVFACP-8-623-34 TO-35C2-3-455-2 TM-05684C/05685B-34 (4)   With   the   generator   operating   at   rated   fre- quency, apply rated load by closing circuit breaker (CB1) (9, figure 6-10). (5)  Adjust  R3  until  ammeter  previously  installed reads 0.6 amps, tighten locknut on R3. R3 is now adjusted properly. (6)  Disconnect  test  equipment  and  proceed  with testing in accordance with test schedule. NOTE Because the proper connection of certain ac out- put control box circuits can only be determined by its ability to function properly when operated in   conjunction   with   the   control   cubicle_: it is imperative that the control cubicle supplied be complete  and  is  functioning  properly  for  all tests. (7)  With  the  unit  running  normally,  test  control box assembly by measuring voltage at load terminals with the reconnection switch in each of its three positions. See table  6-4. b. Remove (see figure 6-8). Remove electrical connec- tor plugs from connectors (2) on side of control box (1). Remove two screws (3), lockwashers (4), bevel washers (5), lockwashers (6), and nuts (7). Remove four screws (8) and washers (9) attaching box to skid-base (10) and remove con- trol box(l). c.  Install.  Mount  control  box  (1)  to  skid-base  (10) using screws (8), washers (9). and screws (3), lockwashers (4), bevel washers (5), lockwashers (6), and nuts (7). Reconnect plugs  to  connectors  (2). 6-9.  AC  OUTPUT  CONTROL  BOX  (INTERNAL COMPONENTS). WARNING Before working on the load terminal board or other devices associated with the ac control box, make certain that the Generator Set is not oper- ating, all switches are in the OFF or OPEN posi- tion, and there is no input to the load. Table  6-4.  Terminal  Voltages Switch Position 120V, 1 Phase 120/240 V, 1 Phase 120/208 V, 3 Phase Measure Across L1-L3 L0-L1 L0-L3 L1-L3 L0-L1 L0-L2 L0-L3 L1 -L2 L2-L3 L1-L3 Correct Voltage 120 vac 120 vac 120 vac 240 vac 120 vac 120 vac 120 vac 208 vac 208 vac 208 vac Change  7 6-9