Bose PANARAY MB4 Service-Handbuch - Seite 7

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Audio

Audio Signa

1. Air Leak Test

1.1 Set up the system for test as shown in

Figure 3.

1.2 Apply a 100 Hz, 10 Vrms sine wave to

the input connectors.

1.3 Listen carefully for any air leaks from

around the end cap, drivers and the baffle.

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. Rub and Tick Test

2.1 Perform disassembly procedure 3. It is

not necessary to unplug the wires at the

driver assembly terminals.

2.2 Connect a signal generator directly to

the terminals of the driver under test.

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

driver 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.

Test Procedures

Signal

Generator

Generato

Powe

ower Am

Ampli plifie ier

INPUT

INPU

Figure 3. Panaray

OUTPUT

OUTPU

MB4 Test Setup Diagram

If the noise stays the same, it is normal

suspension noise and the driver is fine.

Suspension noise will not be heard with

program material.

3. Phase Test

3.1 Apply 10 VDC to the loudspeaker input

connector. Apply the positive to pin "1+" and

the negative to pin "1-" of the Neutrik

connector.

3.2 When applying the DC voltage level,

observe the driver cones. They should all

move outward when the DC level is applied.

3.3 Rewire any incorrectly wired driver.

4. System Sweep Test

4.1 Set up the system for test as shown in

Figure 3.

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

loudspeaker input connector.

4.3 While listening to the output of the

system, sweep the input frequency slowly

from 10 Hz to 400 Hz.

4.4 Listen carefully for any extraneous

noises such as buzzing or ticking.