Bose 402 Series Manuel d'entretien - Page 7

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1. Phase Test

1.1 Observing polarity, apply 9 VDC to the

input connector. Refer to the figure below.

1.2 All driver cones should move outward.

Referring to figure 4, rewire any driver that

moves inward.

2. Crossover Test

2.1 Connect a 0.5 Ohm resistor and amplifier

to the speaker input connector as shown in

the diagram below.

Amplifier

Speaker output

2.2 Apply a 2 Vrms, 8 kHz signal to the

speaker input connector.

2.3 Measure the voltage across the 0.5 Ohm

resistor. It should be 68-90 mVrms. If the

voltage is out of range, check the crossover

components and wiring.

3. Rub and Tick Test

3.1 Apply a 9 Vrms, 10 Hz signal to the

speaker input connector.

3.2 No extraneous noises such as rubbing,

scraping or ticking should be heard.

Note: To distinguish between normal suspen-

sion noise and rubs or ticks, slightly displace

the cone of the driver with your fingers. If the

TEST PROCEDURES

Positive input

Negative input

Volt meter

Speaker

0.5 Ohm

noise can be made to go away or get worse, it

is a rub or 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.

4. Air Leak Test

4.1 Apply a 15 Vrms, 65 Hz signal to the

speaker input connector.

4.2 Listen for air leaks around the drivers and

cabinet seam. Reposition or replace any

gasket that is found to leak. Repairs made to

the cabinet seam should not be visible from

the exterior of the speaker.

5. Sweep Test

5.1 Apply a 9 Vrms, 10 Hz signal to the

speaker input connector.

5.2 Sweep the signal generator from 10 Hz to

500 Hz.

5.3 Apply a 500 Hz, 2 Vrms signal to the

speaker input connector.

5.4 Sweep the signal generator from 500 Hz

to 5 kHz.

5.5 Listen for buzzes, rattles or other noises.

Redress any wire that buzzes; replace any

driver that is found to be defective.

Note: A whooshing noise from the port at its

resonance frequency of approximately 90 Hz

is acceptable.