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Page Title: 2-55. Power Switch.
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TM 55-4920-400-13 g.  Adjustment    of  Brushes.  Tension   on   the brushes  is  controlled  automatically  by  the  brush springs. To adjust brush holder settings, proceed as follows: (1) Loosen setscrews. (2) Remove  safety  wire,  screw,  brush  holder screw  assembly  washer,  snap-ring,  and  brush  and spring assembly from the brush holder. (3) Position brush holder so that end of brush will be parallel to the commutator bar (brush hold- ers  should  line  up  with  each  other  when  properly set). (4)  When  brush  holder  is  properly  aligned, tighten  setscrew. (5) Replace brush and spring assembly, snap- ring, washer, and brush holder screw assembly. NOTE (Coat exposed internal threads of com - mutator  bracket  into  which  setscrew is  installled  with  chemical  film,  Mll- itary Specification MIL-C-5541. 2-55. Power Switch.  Replace the power switch in the  following  manner. a. Removal. (1)  Remove   mounting   nut   securing   power switch to tester case. Remove power switch. (2)  Unsolder  and  remove  leads  from  power switch. b. Installation.. (1) Solder  leads  on  power  switch.  Check  for continuity. (2)  insert  power  switch  into  hole  in  tester switch, with the white/black and white/red leads to ‘the front of case, and secure with mounting nut. 2-56.   Fuse.  Replace  the  cartridge  fuse  with  the Spare cartridge fuse as soon as possible. Replace the spare fuse as soon as possible. 2-57.  Indicator  Light. a.  Disassembly.   Remove  cap  from  light  base. Press lamp and turn counterclockwise to remove. b. Removal. (1)  Unsolder  leads  and  remove  from  light base. (2) Remove  mounting  nut  securing  light  base to tester case. Remove light base. c.  Installation. (1) Insert light base in tester case and secure with  mounting  nut. (2) Solder leads on light base. d. Reassembly. (1) Insert  lamp  in  light  base  and  turn  clock- wise   to   secure. (2) Install cap on light base. 2-58. Wiring Harness.  Repair the wiring harness by replacing a defective lead or replace harness as follows: a. Removal. (1) Remove chassis assembly from tester case and disconnect plug connector. (2) Unsolder  wiring  harness  leads  on  trans- former,  rectifier  and  power  switch;  identify/tag each lead removed. (3)  Remove  nut  and  screw  securing  ground leads to chassis. (4)  Remove  wiring  harness  and  grommets from chassis. b.  Installation. (1) Install  grommets  and  insert  wiring  har- ness in chassis. (2) Insert  screw,  install  ground  leads  and  se- cure with nut. (3)  Solder  wiring  harness  leads  on  trans- former  rectifier  and  power  switch  in  reverse  order as  above. (4) Attach  plug  connector  and  install  chassis assembly in tester case (para. 2-46). Check each re- soldered lead for continuity. 2-59.  Power   Cables.   The  power  cables  are  in- spected and repaired or replaced as follows: a. Inspection. (1)  Inspect  the  cable  assemblies  for  cracks, breaks, cuts, distortion, and damaged threads. (2) Test  the  cable  assemblies  for  continuity. (3)  Perform  a  high  potential  test  on  each cable  assembly.  Refer  to  Military  Specification MIL-C-5015. b. Repair or Replacement. (1)  When  replacing  wire  or  connectors,  use identical parts. (2)  Replace  a  defective  cable  assembly  that cannot be repaired. 2-17

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