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Page Title: Figure 3-42. Applying Insulating Compound on a Transistor
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TM 9-254 3-13. Using Expendables - Continued (1) Silicone   compound   is   used   as   an   insulator   and   heat   dissipator   when   replacing   surface   mounting transistors (1) in electrical circuits. (2) Remove two hex nuts (5), two insulators (6), and two machine screws (2) from the chassis (3).  Remove transistor (1) and mica washer (7) from the chassis. (3) Clean the mounting surface of chassis (3) with alcohol and a brush or a clean cloth. (4) Spread a thin even coating to the bottom surface of the replacement transistor (1) and to both sides of the replacement mica washer (7). KEY to figure 3-42: 1. Transistor 5. Nut, hex (2) 2. Screw, machine (2) 6. Insulator (2) 3. Chassis 7. Washer, mica 4. Leads, transistor Figure 3-42.  Applying Insulating Compound on a Transistor (5) Position  the  mica  washer  (7)  on  the  bottom  of  the  replacement  transistor  (1)  with  the  leads  of  the transistor protruding through the two holes in the center of the mica washer. (6) Aline the mounting holes in the mica washer (7) with the mounting holes in the replacement transistor (1) and insert two machine screws (2). (7) Aline the two machine screws (2) and the two leads (4) of the replacement transistor (1) with the holes in the chassis (3) and press in place. (8) Position  two  insulators  (6)  and  install  two  hex  nuts  (5)  onto  the  two  machine  screws  (2)  and  tighten securely. (9) Use a clean, dry cloth to wipe off any excess silicone compound from around the base of the transistor. g. Heat  Shrinkable  Sleeving  (fig.  3-43).    Heat  shrinkable  sleeving  is  used  to  cover  solder  joints  on  variable resistor terminals, relay terminals, switch terminals, transformer terminals, and connector pins.  A general  procedure  for installing heat shrinkable sleeving is described below: 3-40

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