TM 11-5820-890-30-4 4-53. REPLACEMENT OF TRANSISTOR Q1. Tools: Flat  tip  screwdriver Cross  tip  screwdriver Torque  screwdriver Soldering  kit Expendable Supplies: Solder References: Paragraph Alcohol Cotton swabs 4-52  for  removal  and  installation  of  access  cover. ITEM ACTION REMARKS REMOVAL a. b. c. d. e. Mounting  adapter Access  cover  (1) Two  screws  (1),  lock- washers,  flat  washers, and insulating washers Transistor Q1 (3) Mounting  pad  (4) INSTALLATION f. g. h. i. Mounting  pad  (4) Transistor Q1 (3) Two  screws  (1),  lock- washers,  flat  washers, and insulating washers Access cover (1) Set  on  work  surface  with  right  side toward  you. Remove  and  retain  access  cover  (1). Using  cross  tip  screwdriver,  remove  and retain  two  screws  (1),  Iockwashers,  flat washers,  insulating  washers,  and  terminal lug  securing  transistor  Q1  (3)  to  audio amplifier  chassis  (2). Remove  and  discard  insulation  sleeving on  transistor  leads.  Using  soldering  kit, tag  and  desolder  wires  from  transistor leads.  Remove  and  discard  defective transistor  Q1  (3). Inspect  and  replace  as  required. Install  replacement  mounting  pad  (4)  on bottom  of  transistor  Q1  (3). Install  replacement  insulation  sleeving  on transistor  leads.  Using  soldering  kit,  solder tagged  wires  to  correct  leads  of  transistor Q1  (3).  Remove  wire  tags. Using  cross  tip  screwdriver,  install  two retained  screws  (1),  Iockwashers,  flat washers,  insulating  washers,  and  terminal lug  securing  transistor  Q1  (3)  to  audio amplifier  chassis  (2). Install. See  figure  4-14.  Refer  to paragraph  4-52  for  access cover  removal  procedures. See  figure  4-15. This was removed in step  e. These  were  removed  in step  d. Before  and  after  soldering, clean wires and leads with alcohol  and  cotton  swabs. These  were  removed  in step  c. See  figure  4-14. These  were  removed  in step  b.  Refer  to  paragraph 4-52  for  access  cover installation  procedures. 4-160