Bose Personalized Amplification System Troubleshooting Manual - Page 31

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Bose Personalized Amplification System Troubleshooting Manual

Bass Module Tests

Connect the Bass Module under test to an

amplifier using the test cables described in

the appendix of this troubleshooting guide.

1. Air Leak Test

1.1 Apply a 100 Hz, 10 Vrms sine wave to

the unit under test.

1.2 Listen carefully for air leaks from around

the end cap, the transducers and the grille.

Air leaks will be heard as a hissing or sput-

tering sound. All repairs must be hidden.

Test duration should be 5 seconds minimum.

2. Transducer Rub and Tick Test

2.1 Remove the transducer you wish to test

using the disassembly procedures in this

manual. Do not unplug the wires at the

transducer assembly terminals.

2.2 Connect the transducer to an amplifier

that is driven by an audio signal generator.

Connect directly to the terminals of the

transducer assembly under test.

2.3 Apply a 10 Hz, 10 Vrms signal to the

transducer assembly.

2.4 Listen carefully for any extraneous

noises such as rubbing, scraping or ticking.

Note: To distinguish between normal sus-

pension noise and rubs or ticks, displace the

cone slightly with your fingers. If the noise

stays the same, it is normal suspension

noise and the driver is good. Suspension

noise will not be heard with program mate-

rial.

TEST PROCEDURES

3. Transducer Phase Test

3.1 Momentarily apply a DC voltage of 10V,

positive applied to the positive terminal of

the test cable and GND connected to the

GND terminal. The bass module test cable

is described in the appendix of this trouble-

shooting guide.

3.2 With the DC voltage applied, both of the

driver cones should move outward.

3.3 Rewire any incorrectly wired driver.

4. Bass Module Sweep Test

4.1 Connect the B1 bass module to an

amplifier that is driven by an audio signal

generator. Use the bass module test cable

described in the appendix of this service

manual.

4.2 Apply a 10Hz, 10Vrms sine wave to the

input of the bass module.

4.3 While listening to the output of the bass

module, sweep the input frequency slowly

from 10Hz to 400Hz. Test duration should be

5 seconds minimum.

4.4 Listen carefully for any extraneous

noises such as buzzing and ticking.