Bose ACOUSTIMASS 3 Manual page 15

C. Lower the PCB (solder side up) into place on
top of the transformer cup. There are holes in
each corner of the PCB that align with the locator
pins on the cup. The transistors (on PCB edges)
should rest lightly on the transistor spring clips
(14). Place the transformer primary connector
wires into the slot on the PCB.
NOTE: If no further servicing is required, use the
simplified steps below to reassemble the unit.
D. Replace the heatsink (9) using Procedure 6,
steps A and B.
E. Place the transformer primary into the slot on
the Amplifier PCB (11).
F. Secure the adapter bracket (8) and Main PCB
(5) using Procedure 6, step C.
G. Secure the heatsink, adapter bracket and
Main PCB to the module with 6 screws (10).
H. Replace the cover (3) using Procedure 2.
9. Transformer Assembly Removal
NOTE: If direct access to the transformer is
required and the unit has not been
disassembled, refer to the simplified steps
provided in Procedure 7, along with step A of
this procedure.
A. Remove 4 screws (15) and 4 washers (16)
using a 3/32-inch Allen wrench and lift the
transformer assembly (18) out of the transformer
cup.
NOTE: With the module's label side facing you,
the transformer's primary side is on the left and
the secondary side is on the right.
10. Transformer Assembly Replacement
NOTE: The transformer bracket (part of the
assembly) has a bent flange in one corner that
will only allow the transformer to fit in the
transformer cup (19) one way.
A. Lower the transformer assembly (18) into the
transformer cup.
B. Align the screw holes on the transformer with
those on the cup.
C. Secure the transformer to the cup with 4
screws (15) and 4 washers (16) using a 3/32-inch
Allen wrench.
NOTE: If no further servicing of the unit is
required, refer to the simplified steps provided in
Procedure 8 to reassemble the unit.
11. Transformer Cup and Gasket Removal
NOTE: To directly access the transformer cup
and gasket, follow the simplified steps provided
in Procedure 9, then proceed with steps A and
B of this procedure.
A. Remove 2 screws (10) that secure the
transformer cup (19) to the module and lift the
transformer cup away from the module.
NOTE: There might be woofer connector wires
(safety controlled cable (24)) taped over the
transformer cup gasket (20). Note the location of
the cable relative to the module. Remove the
tape and move the wires aside.
B. Remove the transformer cup gasket.
12. Transformer Cup and Gasket Replacement
NOTE: The transformer cup gasket (20) has
raised edges that should be face up when
positioned in the transformer cup. The gasket
also has a U-shaped opening that aligns
precisely with the module.
A. Place the gasket in position over the opening
of the module.
B. Lay the woofer cable (24) over the appropriate
corner of the bass module. The wires must cross
over the top of the gasket.
C. Position the transformer cup. The cup has a
locating ridge and only fits into the module one
way. The lip should be aligned with the U-shaped
opening in the module.
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