Bose ACOUSTIMASS 3 Service Manual page 15

C. Push down the corners of the PCB until all 4
adapter bracket snaps (not shown) engage.
Make sure that the J5 connector pins are
completely re-connected to the mating connector
housing.
D. Plug in the flat,16-pin cable (13) to the PCB.
E. Secure the PCB to the bracket with 1 screw
(6).
F. Place the connector gasket (7) over the
connector panel.
5. Adapter Bracket and Heatsink Removal
NOTE: It is only necessary to remove 3 screws
(10) to remove the adapter bracket (8). These
screws are located on the same side as the
module's labels. The bracket hooks onto a flange
that is part of the heatsink (9). If further teardown
of the unit is required,then all 6 screws (10)
should be removed.
A. Remove 6 screws (10) that secure the adapter
bracket and the heatsink to the module.
B. Pull the bracket and heatsink away from the
module.
NOTE: The Amplifier PCB Assembly (11) may be
stuck to the heatsink with thermal grease.
6. Adapter Bracket and Heatsink Replacement
A. Lower the heatsink (9) into position on top of
the Amplifier PCB (11). Make sure that the side
of the heatsink with smaller fins is aligned with
the module's label side.
B. Align the screw holes on the heatsink with
those on the transformer cup (19).
C. Hook the bracket onto the heatsink
flange.Lower the adapter bracket (8) into
position. The bracket has screw holes only on
one side. These should be aligned with the screw
holes on the module's label side.
D. Secure the heatsink and adapter bracket to
the module with 6 screws (10).
7. Amplifier PCB Assembly Removal
NOTE: It is not necesary to completely tear down
the unit to access the Amplifier PCB (11). Follow
the simplified steps A-D below if direct access to
this PCB is required and you have not already
disassembled the unit.
A. Remove the cover (3) using Procedure 1.
B. Unplug the flat,16-pin cable (13).
C. Remove 6 screws (10) which secure the
adapter bracket (8) and heatsink (9) to the
module.
D. Lift the EQ PCB (5),adapter bracket and
heatsink away from the module.
NOTE: The EQ PCB should remain connected to
the transformer primary side. It should also
remain secured to the adapter bracket with 1
screw (6).
E. Lift up the Amplifier PCB (11) and unhook
connectors J1 and J4 from the PCB. J4 is
connected to the woofer and J1 is connected to
the transformer assembly's (18) secondary side.
Pull the PCB away from the unit.
F. Remove the 2 transistor spring clips (14)
which rest on the transformer cup (19).
8. Amplifier PCB Assembly Replacement
A. Place the 2 transistor spring clips (14) on the
transformer cup (19).
B. Re-connect connector J4 to the safety-
controlled woofer cable (24) and connector J1 (5
pin) to the transformer assembly's (18)
secondary side.
NOTE: The Amplifier PCB (11) has large
capacitors which will only fit into one side of the
transformer cup (19).
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