Bose 131 Manuale di servizio - Pagina 5

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1. Phase Test

1.1 Momentarily apply 13.3 ± 1Vdc to the

speaker input terminals. Observe polarity

when connecting the dc power supply. The

driver should move outward.

2. Air Leak Test

2.1 Apply a 6Vrms, 10-15Hz signal to the

speaker input terminal.

2.2 Listen for air leaks around the driver

and the enclosure. There should be no

audible air leaks.

3. Rub and Tick Test

3.1 Apply a 6Vrms, 10Hz signal to the

speaker input terminals.

3.2 No extraneous noise such as rubbing,

scraping or ticking should be heard.

Note: To distinguish between normal

suspension noise and rubs or ticks, dis-

place the cone of the driver slightly with

your fingers. If the noise can be made to go

away or get worse, it's a rub or tick and the

driver should be replaced. If the noise stays

the same, it's normal suspension noise and

it will not be heard with program material.

TEST PROCEDURE

4. Power Sweep Test

4.1 Apply a 6Vrms, 10-15Hz signal to the

speaker input terminals.

4.2 Sweep the speaker from 10Hz to

15kHz. The sweep rate shall be 3-5

seconds for increasing and decreasing

sweep.

Note: A whooshing noise from the port at

approximately 90Hz is acceptable.

4.3 Listen for any buzzes, rattles, or other

extraneous noises. Replace any driver that

fails, and redress any wires that might

buzz.