Bose-111-Service-Manual.pdf

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Model 151™ and 111™ ENVIRONMENTAL SPEAKER SYSTEM
SPECIFICATIONS
Transducer:
1-4.5" (11.4 cm) full-range,
environmental driver
Nominal Impedance:
4 Ohms
Cabinet:
Black or white high-impact molded
polypropylene
Speaker Dimensions:
6.1"H x 9.1"W x 5.9" D
(15.4 H x 23.0 W x 15.0 D cm)
Shipping Weight
4.0 lbs. (1.8 kg) Per Speaker
IEC Power Rating:
Min: 10 Watts Per Channel
Max: 40 Watts Per Channel
©
200 Bose Corporation
Service Manual
Test Procedures
NOTES:
In each test procedure, it is necessary to remove the grille to access the driver.
Refer to the
Grille Removal
procedure.
Polarities are not marked on the input terminals of the 151™ speaker. The red terminal is
the positive (+) terminal and the black terminal is the negative (-) terminal. See
Figure 1.
1. Rub and Tick Test
A.
Connect a sine wave oscillator to a power amplifier. Adjust the frequency of the oscillator
to
10 Hz
and the amplifier output to
6 Vrms.
Connect the amplifier output to the input
terminals of the 151 speaker (see
Figure 1).
No extraneous noises such as rubbing,
scraping or ticking should be heard.
NOTE:
To distinguish between normal suspension noise and rubs or ticks, displace the
cone on the driver slightly with your fingers. If the noise can be made to go away or get
worse, it is a rub or a tick and the driver should be replaced. If the noise stays the same, it
is normal suspension noise and the driver is fine. Suspension noises will not be heard with
program material.
2. Sweep Test
A.
Sweep the oscillator from
10 Hz
to
3 kHz
using the
6 Vrms
signal. There should not be
any loud extraneous sounds. (Note: A "whooshing" noise from the port at approximately
80
Hz
is acceptable). If there are any loud buzzes or distortion, replace the driver. (See
Disassembly/Assembly Procedures
for instructions on replacing the driver).
NOTE:
There should not be any buzzes or rattles from within the speaker cabinet. Redress
any wire or component that buzzes.
B.
Reduce the amplifier output to
3 Vrms
and continue sweeping from
3 kHz
to
15 kHz.
If
there is any buzzing or distorting,replace the driver (see
Disassembly/Assembly
Procedures
for instructions on replacing the driver).
1
Audio Signal
Generator
Power Amplifier
Input
Output
-
-
+
+
-
+
Speaker
+ -
Red (+)
Black (-)
Figure 1. Test Connections 151™ Speaker
3. Air Leak Test
A.
Using the
6 Vrms
signal,set the oscillator frequency to
10 Hz.
Block the ports. For at
least
3 seconds,
listen for air leaks around the driver and baffle. If there is a "whooshing"
noise around the driver, re-position the driver gasket behind the driver to make an airtight
seal. If there are similar noises around the baffle, make sure that it is securely fastened to
the speaker cabinet.
4. Phase Test
NOTE:
Supply voltage should only be momentarily applied to the speaker input terminals to
avoid possible damage to the speaker.
A.
Set a
DC
power supply to
10 volts.
To ensure that the driver is connected in phase,
connect the positive lead of the supply to the positive (+) speaker input terminal and the
negative lead to the negative (-) input terminal. The driver should move outwards with the
application of the supply voltage.
2
Disassembly/Assembly Procedures
NOTE:
Refer to
Figure 2
for an exploded view of the speaker assembly. Certain parts will
be referred to in these procedures. The item number which corresponds to the part will be
enclosed in parentheses-i.e.-grille
(1).
1. Grille Removal
NOTE:
The grille is made entirely of
metal.
Do not try to remove the grille by pulling on the
plastic (polypropylene) speaker enclosure.
A.
Insert the tip of a scribe or nail through one of the perforations in the grille
(1).
Hint:
Insert at one of the corners.
Carefully
work the grille out of the retaining slot.
2. Grille Replacement
A.
To install the grille
(1),
make sure that it is oriented as shown in
Figure 2.
B.
Align the grille to the speaker enclosure and push in lightly.
3. Driver Removal
A.
Remove 3 screws
(4)
which secure the driver
(3)
to the speaker baffle
(6).
B.
Carefully lift the driver out of the enclosure and cut the wires as close to the driver
terminals as possible.
4. Driver Replacement
A.
Strip the wires and connect to the replacement driver
(3).
Make sure that the
red
wire is
connected to the
positive (+)
terminal and the
black
wire is connected to the
negative (-)
terminal of the driver. Make sure that the driver terminals are centered in the speaker
enclosure. The correct orientation is shown in
Figure 2.
B.
The gasket
(5)
must also be correctly positioned behind the driver to provide an airtight
seal. Secure the driver
(3)
to the baffle
(6)
with 3 screws
(4).
Repeat the driver test
procedures.
3
5. Baffle Removal
A.
Remove 6 screws
(4)
that hold the baffle
(6)
in place. (Removing the driver is
not
necessary).
Stick your fingers in the baffle ports and pull the baffle carefully away from the enclosure. It may
take quite a bit of force to accomplish this task.
6. Baffle Replacement
A.
Align the port side of the baffle
(6)
to the side of the enclosure that has the input terminals
(9).
The baffle will only fit one way. Secure the baffle to the enclosure with 6 screws
(4).
Repeat the air
leak test.
4

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