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Page Title: REPLACEMENT OF CIRCUIT BREAKER CB1
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TM 11-5820-890-30-5 4-31.  REPLACEMENT  OF  CIRCUIT Tools: 1/2-inch  open-end  wrench 1/2-inch   socket Expendable  Supplies: Cotton  swabs References: BREAKER CB1. Flat  tip  screwdriver Torque  wrench Torque   screwdriver Soldering  kit Solder Alcohol Figures  4-5  and  4-10  for  location  of  amplifier  adapter  parts. ITEM ACTION REMARKS REMOVAL a.  Mounting  adapter b.  Six  captive  screws  (13) and  front  access  cover (11) c.   Circuit   breaker   CB1   (10) d.   Wires INSTALLATION e.   Wires f. Circuit  breaker CB1 (10) Front   access g. cover  (11)  and  six captive  screws  (13) Set  on  work  surface  with  left  side toward  you. Using  flat  tip  screwdriver,  fully  loosen  six captive  screws  (13)  securing  front  access cover  (11)  to  power  control  chassis  (10). Remove  front  access  cover.  Inspect  front access  cover,  replace  if  required. Using  1/2-inch  open-end  wrench,  remove and  retain  nut,  IET  Iockwasher,  ON/OFF plate,  and  locking  ring  securing  defective circuit  breaker  CB1  (10)  to  power  control chassis  (17).  Remove  circuit  breaker  from power  control  chassis. Using  soldering  kit,  tag  and  desolder  wires from  leads  of  circuit  breaker.  Remove  and discard   circuit   breaker. Using  soldering  kit,  solder  tagged  wires to  leads  of  replacement  circuit  breaker. Remove  wire  tags. Position  circuit  breaker  CB1  (10)  into power  control  chassis  (17)  and  install retained  locking  ring,  ON/OFF  plate, Iockwasher,  and  nut.  Using  1/2-inch socket  and  torque  wrench,  secure circuit  breaker  to  power  control  chas- sis  (17).  Torque  nut  to  19  to  21  in-lb. Hold  in  place  and  tighten  six  captive screws  (13)  securing  front  access  cover (11)  to  power  control  chassis  (10). Using  torque  screwdriver,  torque  screws to  8  to  10  in-lb. See  figure  4-5. See  figure  4-10. Before  and  after  soldering, clean  wires  and  leads  with alcohol  and  cotton  swabs. These  were  removed  in step  c. See  figure  4-5. This  was  removed  in step  b. 4-125


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