Bose 302 A Manual de serviço - Página 6

Procurar online ou descarregar pdf Manual de serviço para Altifalantes Bose 302 A. Bose 302 A 10 páginas. Loudspeaker (commercial indoor/outdoor 70v/100v distributed applications)
Também para Bose 302 A: Manual do instalador (13 páginas), Ficha de dados técnicos (2 páginas), Manual do instalador (7 páginas)

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Test setup note: Disconnect the input of the

speaker from the transformer for procedures

1-5.

1. Woofer Rub and Tick Test

1.1 Apply a 1 Vrms, 10Hz signal to the

speaker input terminal. 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 woofer with your fingers. If the

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

is a rub or tick and the woofer should be

replaced. If the noise stays the same, it is

normal suspension noise and the woofer is

okay. Suspension noise will not be heard with

program material.

2. Air Leak Test

2.1 Apply an 8 Vrms, 65Hz signal to the

speaker input terminal.

2.2 Listen for air leaks around the cabinet

seams, the Twiddler™ driver panel, and the

woofer and Twiddler driver gaskets. Reposi-

tion 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.

Note: A whooshing noise from the ports at

approximately 65Hz and 185Hz is acceptable

(port tuned frequencies).

3. Twiddler Driver Phase Test

3.1 Check the wiring of the Twiddler driver

against Figures 1 and 3.

4. Sweep Test

4.1 Apply an 8 Vrms, 10Hz signal to the

speaker input terminal.

4.2 Sweep the signal generator from 10Hz to

5 kHz and then back to 10Hz.

4.3 Apply a 3 Vrms, 5 kHz signal to the

speaker input terminal.

TEST PROCEDURES

4.4 Sweep the signal generator from 5 kHz to

15 kHz and then back to 5 kHz.

4.5 Listen for buzzes, rattles or other noises.

Redress any wire that buzzes; replace the

woofer or Twiddler driver if they are found to

be defective.

5. Woofer Phase Test

5.1 Observing polarity, momentarily apply 8

VDC to the speaker input terminal.

Note: To avoid damaging the speaker, only

momentarily apply the DC voltage.

5.2 The woofer should move outward with the

application of the DC voltage.

Green

6. Transformer Test

6.1 Connect the output of the transformer to

the speaker input terminal.

6.2 Apply a 35 Vrms, 50Hz signal to the input

of the transformer.

6.3 Sweep the signal generator from 50Hz to

5 KHz. Listen for clean undistorted audio

output.

22uF

Yellow

Woofer

15uF

Green

1.5mH

11 Ohm

Figure 3. Schematic Diagram

Yellow

Twiddler driver 1

Gray

Twiddler driver 2

Red