4
Note: Refer to Figure 6 for the following
procedures.
1. Grille removal
1.1 Using your fingers, grasp the grille (1)
edge nearest the port slot and gently pull
the grille away from the cabinet until it
comes free.
1.2 Grasp the opposite edge of the grille
and gently pull it away from the cabinet
until it comes free as well.
2. Grille replacement
2.1 Orient the grille (1) so that the Bose
®
logo is aligned with the print on the rear of
the cabinet.
2.2 Align the two grille posts on the curved
grille edge with the cabinet post holes and
press the grille edge in place.
2.3 Align the two grille posts at the
opposite grille edge with the grille socket
grommets (4) and press the grille in place.
The grille should be neat and flush with the
cabinet.
3. Driver removal
3.1 Remove the grille (1) using
procedure 1.
3.2 Using a phillips-head screwdriver,
remove the three screws (2) that secure the
driver (3) to the speaker cabinet.
3.3 Using your fingers, grasp the plastic
basket of the driver and pull gently. The
driver should come free.
3.4 Note the driver wiring color code, and
cut the wires as close to the terminals as
possible.
4. Driver replacement
4.1 Observing polarity, solder the wires
from the crossover assembly (8) to the
driver (3) terminals.
4.2 Orient the driver correctly into the
cabinet and secure it using the screws (2)
removed in procedure 3.2.
4.3 Replace the grille (1) using
procedure 2.
5. Crossover Assembly removal
5.1 Remove the grille (1) and angled
driver (3) using procedure 3.
5.2 Remove the batting material and retain
it for replacement later.
5.3 Using a long shaft phillips-head
screwdriver, remove the four screws that
secure the crossover assembly (8) to the
interior of the speaker cabinet.
5.4 Unsolder the driver and binding post
connector (9) wires from the crossover
assembly.
Note: Refer to Figure 3. Model 300PM
Loudspeaker driver wiring diagram, for
the following procedure.
6. Crossover Assembly replacement
6.1 Solder the driver (3) and binding post
connector (9) wires to the appropriate
locations on the crossover assembly (8).
6.2 Secure the crossover assembly to the
interior of the speaker cabinet in the
previous location using the four screws
removed in procedure 5.3.
6.3 Replace the batting material removed
in procedure 5.2.
6.4 Replace the driver and grille (1) using
procedure 4.
DISASSEMBLY/ASSEMBLY PROCEDURES
