Bose WAVE RADIO III Manuel d'entretien - Page 5

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Audio Signal

Generator

Acoustimass

Module

Power Amplifier

Inputs

Outputs

Figure 1. Acoustimass

Setup Diagram

1. Bass Module Air Leak Test

1.1 Apply a 100 Hz, 10 Vrms sine wave to

the left and right channel inputs of the bass

module. Do not connect the satellite

speakers.

1.2 Listen carefully for air leaks from

around the terminal cup and cabinet

seams. Air leaks will be heard as a hissing

or sputtering sound. All repairs must be

hidden. Test duration should be 5 seconds

minimum.

2. Woofer Phase Test

2.1 Apply a 50 Hz, 10 Vrms sine wave to

the left and right channel inputs of the bass

module.

2.2 While the signal is being applied to the

bass module, remove the input to one of

the channels.

2.3 The sound output level should drop by

approximately half. If the sound output level

increases or stays the same, then there is a

wiring problem in the woofers.

TEST PROCEDURES

Satellite Speakers

5 Series III Test

3. Woofer Rub and Tick Test

3.1 Perform Disassembly/Assembly

procedure 5. Do not cut the wires at the

woofer assembly terminals.

3.2 Connect a signal generator directly to

the terminals of the woofer assembly

under test.

3.3 Apply a 10 Hz, 10 Vrms signal to the

woofer assembly.

3.4 Listen carefully for any extraneous

noises such as rubbing, scraping, or

ticking.

Note: To distinguish between normal

suspension 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 woofer is fine.

Suspension noise will not be heard with

program material.

4. System Sweep Test

4.1 Set up the system as shown in

Figure 1.

4.2 Apply a 10 Hz, 10 Vrms sine wave to

the left and right signal inputs.

4.3 While listening to the output of the

system, sweep the input frequency slowly

up from 10 Hz to 500 Hz.

4.4 The output should smoothly cross over

from the bass module to the satellite

speakers.

4.5 Reduce the input voltage level to

5 Vrms.

4.6 Continue sweeping from 500 Hz to 15

kHz. Replace any satellite assembly that

buzzes or sounds distorted.

Note: The Acoustimass 5 Series III satellite

assemblies are non-repairable. If you have

a defective satellite assembly, it must be

replaced.