Bose 10.2 Stereo Everywhere Service Manual - Page 12
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102
Flush-Mount and 102 Surface-Mount
Loudspeaker Test Procedures
Note: All testing for transformer variation
units shall be done with the tap switch in
the high position. The high impedance of
the transformer allows testing with any
conventional power amplifier.
Note: The 102 Flush-Mount Loudspeakers
have input wires with the white wire being
the positive, while the 102 Surface-Mount
has input terminals that are clearly marked.
1. Rub and Tick Test
1.1 Connect the test setup as shown in
Figure 7.
1.2 Apply an 8 Volt rms, 80 Hz signal for 4
and 8 ohm units; 30 Volt rms, 80 Hz for
transformer units, to the speaker input
terminals.
1.3 Replace any driver that has a rubbing
or ticking noise. Quiet ticks are acceptable
if they cannot be heard at a distance of 1
foot.
Note: To distinguish between normal
suspension noise and rubs or ticks, remove
the grille and displace the surround of the
driver slightly with your fingers. If the noise
can be made to go away, or get worse, it is
a tick or a rub, and the driver should be
replaced. If the noise stays the same, it is
suspension noise and the driver is fine.
Suspension noises will not be heard with
program material.
TEST PROCEDURES
Audio Signal
Generator
Figure 7. Test Connections for 102F or 102S
12
+ -
102F
+
-
Loudspeaker
2. Sweep Test
2.1 Sweep the oscillator from 10 Hz to 3
kHz, using the appropriate voltage found in
the 102 Loudspeaker test signals table
below.
2.2 Reduce the output of the amplifier to
the appropriate voltage listed in the table
below and continue sweeping from 3 kHz
to 15 kHz.
2.3 If there are any loud buzzes or distor-
tion, replace the driver.
2.4 If there are any buzzes or rattles from
inside the 102 cabinet, redress the wire or
component causing the noise.
Note: The whooshing noise from the port
around 80 Hz is normal.
102 Loudspeaker Test Signals
Passive Units
8 Volts rms, 10 Hz to 3 kHz
4 Volts rms, 3 kHz to 15 kHz
8 Watt Transformer units
25 Volts rms, 10 Hz to 3 kHz
12 Volts rms, 3 kHz to 15 kHz
25 Watt Transformer units
20 Volts rms, 10 Hz to 3 kHz
16 Volts rms, 3 kHz to 15 kHz
Amplifier
Input
Output
-
-
+
+
102S
BLACK
WHITE