Bose FREESPACE BMA-125 Service Manual page 9

120V DISASSEMBLY/ASSEMBLY PROCEDURES
15. Power Transformer Removal
15.1 Remove the wires that connect to the
AC outlet, power switch and driver PCB.
Note: Make note of the wiring configura-
tion.
15.2 Remove the four nuts that secure the
transformer bracket to the chassis.
15.3 Remove the four screws and nuts that
secure the transformer bracket to the
transformer.
16. Power Transformer Replacement
16.1 Replace the four screws and nuts that
secure the transformer bracket to the
transformer.
16.2 Lower the transformer into the chas-
sis and align the transformer so that the
wires face towards the inside of the unit.
16.3 Replace the four screws that secure
the transformer bracket to the chassis.
16.4 Replace the wires that connect to the
AC outlet, power switch and driver PCB.
17. Output Transistor and Heat sink
Removal
18.1 Remove the four screws that secure
the heat sink to the chassis.
18.2 Lift the heat sink up.
18.3 Remove the two screws that secure
the transistor to the heat sink.
18.4 With a pair of pliers, grab onto the
transistor and pull it out of the transistor
socket.
19. Output Transistor and Heat sink
Replacement.
19.1 Push the transistor into the transistor
socket.
Note: Inspect the mylar insulator for
damage. Replace if necessary. Make sure
the transistor and the transistor socket are
flush with the heat sink.
19.2 Replace the two screws that secure
the transistor to the heat sink.
19.3 Lower the heat sink into the chassis
so that the screws holes in the heat sink
align with the screw holes in the chassis.
19.4 Replace the four screws that secure
the heat sink to the chassis.
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