TM 11-6625-3025-14/ET426-AA-MMA-010/E154 VII210/T.O. 33A1-8-902-1-1
b.
Replacement. Replace any rectifier CR1 through CR4 as follows:
(1)
Install rectifier and secure with insulated washers, wire lug and nut.
(2) Solder wires to rectifier.
(3) Replace filter capacitors circuit board with two screws.
(4) Install heat sink filter assembly described in paragraph 6-25b.
6-29. Power Transistors Q1 and Q2 Removal and Replacement. Perform the following procedure to remove and
replace power transistors Q1 and Q2 (see figure FO-22).
a.
Removal. Remove power transistor Q1 or Q2 as follows:
(1) Remove heat sink filter assembly described in paragraph 6-25a.
(2) Remove two screws securing filter capacitors circuit board.
(3) Remove two screws, nylon washers, lockwashers, nylon spacers, mica insulator and nuts securing
transistor to heat sink and circuit board.
(4) Unsolder transistor terminals connected to circuit board and remove from circuit board and heat sink.
b.
Replacement. Replace transistor Q1 and Q2 as follows:
(1) Apply silicon thermal compound to base of transistor.
(2) Insert mica insulator over transistor terminals.
(3) Insert transistor with 2 screws and mica insulator into the holes in heat sink.
(4) Place nylon spacers and washers over screw threads, insert into circuit board and secure with
lockwashers and nuts.
(5) Solder transistor terminals to circuit board.
(6) Replace filter capacitors circuit board with two screws.
(7) Install heat sink filter assembly described in paragraph 6-25b.
6-30. Voltage Regulators Z1 and Z3 Removal and Replacement. Perform the following procedure to remove and
replace voltage regulators Z1 and Z3 (see figure FO-22).
6-18
