Disassembly Procedures - Bose 2150 Service Manual

DISASSEMBLY PROCEDURES

Note: Refer to Figure 1 for the following
procedures.
1. Top Cover Removal
1.1 Remove the three screws (3) that secure
the rack-mount ears (2) to the amplifier
chassis (7).
1.2 Remove the two screws (4) that secure
the top of the heatsink to the top cover (6).
1.3 Remove the six screws (5) along the
front edge and along the rear edge of the top
cover.
1.4 Remove the six screws (5) along the
sides of the amplifier that secure the top
cover to the amplifier chassis. Lift off the top
cover.
Note: Refer to Figure 2 for the following
procedures.
2. Input Module Removal
2.1 On the back of the amplifier, remove the
two screws (8) that secure the input module
(10) to the amplifier chassis (23).
2.2 Slide out the input module and unplug the
ribbon cable from the J1 connector on the
input module.
Re-assembly Note: Align the red stripe on
the ribbon cable with pin 1 of J1 on the input
module when re-installing.
3. Amplifier Module Removal
3.1 Perform procedures 1 and 2.
3.2 Unplug the amplifier module (2) power
connector from the power supply board at
P600. This is the large four-wire connector
located at the rear corner of the amplifier
module.
3.3 At the front of the amplifier module,
unplug the ribbon cable that runs to the
display board (26) at J700.
3.4 Unplug the ribbon cable that runs from
the interface board (12) to the amplifier
module at J800.
3.5 Unplug the ribbon cable that runs from
the power supply board (25) to the signal
processor board at P300.
3.6 Disconnect the ribbon cable that runs
from J101 on the signal processor board to
the rear corner of the amplifier in the opening
for the input module. Remove the top screw
(4) and nut (27), loosen the bottom screw
and lift the connector away from the chassis.
Be sure to retain the screw and nut for
replacement later.
3.7 Make a note of the connections and
disconnect the two two-wire harnesses that
run from the side of the amplifier module RF
housing to each of the audio transformers
(17). Each of these has a black wire and a
white wire with a black stripe, so be sure to
re-install them into the proper connector
during re-assembly.
3.8 Using a 3/16" nut driver, remove the
screw (7) that secures the rear of the ampli-
fier module RF housing to the bracket (6)
used for the input module connector. Access
to this screw is easiest through the opening
in the rear of the chassis for the input mod-
ule.
3.9 Remove the two screws (1) that secure
the amplifier module heatsink to the amplifier
bottom chassis. Slide the amplifier module
out the side of the chassis.
4. Digital Signal Processor Board
Removal
4.1 Perform procedures 1 and 2.
4.2 At the front of the DSP board, unplug the
ribbon cable that runs to the display board
(26) at J700.
4.3 Unplug the ribbon cable that runs from
the power supply board (25) to the signal
processor board at P300.
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