Bose BUILT-INvisible TA-1 Service Manual page 22

DISASSEMBLY/ASSEMBLY PROCEDURES
4.3 Align the power transformer (4) with the
chassis and secure it in place using the hex
head bolt (2) removed in step 3.3.
4.4 Perform procedure 2.
5. DSP Board Removal
5.1 Perform procedure 1.
5.2 Disconnect the cable that runs from the
Input/Output board (6) to the DSP board (5).
Disconnect the cable that runs from the
amplifier board (14) to the DSP board.
5.3 Using a Phillips-head screwdriver,
remove the four screws (1) that secure the
DSP board to the chassis (8). Lift the DSP
board out of the chassis.
6. DSP Board Replacement
6.1 Align the DSP board (5) with the
chassis (8) and secure it in place using
the four screws (1) removed in step 5.3.
6.2 Connect the cable that runs from the
DSP board to the input/output board (6).
Connect the cable that runs from the DSP
board to the amplifier board (14).
6.3 Perform procedure 2.
7. Amplifier Board Removal
7.1 Perform procedure 1.
7.2 Using a Phillips-head screwdriver,
remove the two screws (11) that secure the
tension clamp (12) to the amplifier board
(14). Lift the tension clamp off of the amplifier
board.
7.3 Using a nut driver, remove the two
standoffs (13) that secure the amplifier
board to the heatsink. Lift the amplifier board
out of the heatsink (16).
8. Amplifier Board Replacement
8.1 Place the thermal conducting insulating
tape strips (15) onto the heatsink (16) where
the amplifier board (14) output devices will
be located.
8.2 Align the amplifier board with the
heatsink and secure it in place using the two
standoffs (13) removed in step 7.3.
8.3 Align the tension clamp (12) with the
amplifier board and secure it in place using
the two screws (11) removed in step 7.2.
8.4 Perform procedure 2.
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