TM 11-5820-890-30-4 Flat  tip  screwdriver Torque  screwdriver 4-32. REPLACEMENT OF LAMP HOLDER DS1. Tools: 1/2-inch  open-end  wrench 1/2-inch  socket 9/16-inch  open-end  wrench 9/16-inch   socket Torque  wrench Soldering  kit Expendable Supplies: Cotton  swabs Solder Alcohol References: Paragraph  4-31  for  removal  and  installation  of  circuit  breaker  CB1. ITEM ACTION REMARKS REMOVAL a.   Mounting   adapter b.  Six  captive  screws  (13) and  front  access  cover (11) c.  Circuit  breaker  CB1  (10) d.  Lens  (16)  and  lamp  (15) e.   Wires f.   Lamp   holder   DS1   (11) INSTALLATION g. h. i. j. k. Lamp  holder DS1 (11) Wires Lens  (16)  and  lamp  (15) Circuit   breaker CB1 (10) Front  access 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. Remove  and  retain. Remove  and  retain  lens  (16)  and  lamp (15)  from  defective  lamp  holder  DS1  (11). Using  soldering  kit,  tag  and  desolder  wires from  defective  lamp  holder  DS1  (11). Using  9/16-inch  open-end  wrench,  remove and  retain  nut  and  Iockwasher  securing defective  lamp  holder  DS1  (11)  to  power control  chassis  (17).  Remove  lamp  holder through  front  of  chassis.  Discard  defective lamp  holder Position  lamp  holder  DS1  to  power  con- trol  chassis  (17)  and  install  retained  lock- washer  and  nut.  Using  torque  wrench  and See  figure  4-5. Refer  to  paragraph  4-31  for removal   procedures. See  figure  4-10. These  were  removed  in step  f. 9/16-inch  socket,  torque  nut  to  29  to  31  in-lb. Using  soldering  kit,  solder  tagged  wires to  leads  of  replacement  lamp  holder  DS1 (11).  Remove  wire  tags.  Replace insulation  sleeving  as  required. Install  retained  lens  (16)  and  lamp  (15) to  lamp  holder  DS1  (11). Install  retained  circuit  breaker  CB1  (10) in  power  control  chassis  (17). 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. Before  and  after  soldering, clean  wires  and  leads  with alcohol  and  cotton  swabs. These  were  removed  in step  d. Refer  to  paragraph  4-31  for installation   procedures. See  figure  4-5. This was removed in step  b. 4-127