TM 1-1270-476-304-654-5. NIGHT SENSOR ASSEMBLY (NSA) REPAIR (cont)6. TRANSISTOR Q1 THRU Q4 REPLACEMENTNOTEThis procedure is for replacing transistor Q1 (17) and can also be used for replacing transistors Q2 (19), Q3 (20), or Q4 (21).REMOVALa. Remove postamplifier cover (1) by removing four socket head capscrews (2) and washers (3).b. Cut lacing and tying tape securing transistor assembly A38 (4) wires in bundle between transistor assembly A38 and postamplifier CCA connector A23J2 (5).c. Disconnect connector A38P1 (6) from connector A23J2 (5) by loosening two screwlocks (7).d. Remove transistor assembly A38 (4) by removing six socket head capscrews (8) and washers (9).e. Tag and unsolder wires (10) from transistor Q1 (17) emitter and base terminals.f. Remove two nuts (12), lockwashers (13), washers (14), insulator disk (15), screws (16), and terminal lug (17) securing transistor Q1 (11), and insulator plate (18) to transistor assembly A38 (4).INSTALLATIONg. Install terminal lug (17) on screw (16).h. Install transistor (11) and insulator plate (18) using two screws (16), insulator disk (15), washers (14), lockwashers (13), and nuts (12). Torque screws (16) to 6 in-lb.i.Solder wires (10) to transistor Q1 (11) emitter and base terminals and remove tags.
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