Bose FREESPACE BMA-125 Service Manual page 8

120V DISASSEMBLY/ASSEMBLY PROCEDURES
7.4 Remove all the wires from the pot.
Note: Make note of the wiring configura-
tion.
8. Input 1, 2, 3, 4 and Master Volume
Control Replacement.
8.1 Attach the wires to the pot.
8.2 Insert the pot's shaft into the hole in
the chassis.
8.3 Replace the nut that secures the pot's
shaft to the chassis.
8.4 Replace the control knobs by pushing
them onto the pot's shaft.
9 Driver PCB Removal
9.1 Remove the four screws that secure
the Driver PCB to the chassis.
9.2 Remove all the connectors and wires
from the PCB.
Note: Make note of the wiring configura-
tion.
9.3 Lift the Driver PCB up.
10. Driver PCB replacement
10.1 Lower the PCB into the chassis so
that the two large capacitors are located
toward the transformer. Align the screw
holes in the PCB with the standoffs on the
chassis.
10.2 Replace the four screws that secure
the driver PCB to the chassis.
10.3 Replace all the wires and connectors
to the driver PCB.
11. Equalizer PCB Removal
11.1 Remove the connector from the
equalizer PCB.
11.2 Remove the two screws that secure
the equalizer to the chassis.
11.3 Lift the equalizer PCB up.
12. Equalizer PCB Replacement
12.1 Lower the equalizer PCB into the
chassis.
12.2 Replace the two screws that secure it
to the chassis.
12.3 Connect the connector to the PCB.
13. Speaker Output Transformer Removal
13.1 Remove all the wires that connect the
transformer to the speaker output terminals
and the driver PCB.
Note: Make a note of the wiring configura-
tion.
13.2 Remove the four nuts that secure the
transformer bracket to the chassis.
13.3 Remove the four screws and nuts that
secure the transformer bracket to the
transformer.
14. Speaker Output Transformer Replace-
ment.
14.1 Replace the four screws and nuts that
secure the transformer bracket to the
transformer.
14.2 Lower the transformer into the chas-
sis and align the transformer so that the
purple and brown wires face towards the
rear of the chassis.
14.3 Replace the four screws that secure
the transformer bracket to the chassis.
14.4 Replace the transformer's wires to the
speaker output terminals and the driver
PCB.
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