Bose Lifestyle PS48 Testverfahren - Seite 2

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PS28/48 Performance Verification Procedures

(Without AV28 Media Center Console)

Test setup procedures

Place the bass module into TAP mode using

the procedures located at the end of this

document.

Note: Place all four DIP switches into the down

position before returning the unit to the customer.

Test cable part number 264564, Figure 16, is

needed to test the bass module.

Connect the D-sub, 9 pin connector on the test

cable to the COM port on your computer.

Connect the RJ-45, 8 pin connector to the

bass module.

The bass module requires a digital audio input.

Connect the analog output of an oscillator to

the analog input of an Analog to Digital (A-D)

converter. Connect the test cable's RCA

connector to the A-D converter S/PDIF output.

1. Sweep Test

1.1 Issue the following TAP commands:

SO ALL D

(select all digital source inputs)

SP 5

(5 speaker mode)

VO CB 0

(set volume to full output, 0dB)

MU AMP OFF (unmute the amp)

1.2 Apply a 200 mVrms, 25 Hz signal to the left

and right input of the analog to digital (A-D)

converter. Listen for any extraneous noises

such as rubbing, scraping, or ticking.

Note: No extraneous noises such as rubbing,

scraping or ticking should be heard. To distin-

guish between normal suspension noise, rubs

and ticks, displace the woofer cone with your

finger. If the sound can be made to go away or

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

should be replaced. If the noise stays the

same, it's normal suspension noise and it will

not be heard with regular program material.

1.3 Sweep the bass module from 40 Hz to 300 Hz.

Listen carefully for any buzzes, rattles

or extraneous noises coming from the bass

module.

Note: Redress any wire or component that

buzzes.

2 Bass Module Air Leak Test

2.1 Apply a 200 mVrms, 40 Hz signal to the

input of the A-D converter.

2.2 Check for air leaks from the cabinet. Listen

near the areas where the plastic seals to the

wood.

3. Cube Speaker Phase Test

Note: The DC voltage should only be momen-

tarily applied to the cube speaker input to avoid

damaging the speakers.

3. 1 Observing polarity, momentarily apply 8 Vdc to

the input of the cube speaker.

3.2 The speakers should move outward with

the application of the dc voltage. Check the

cube wiring if it moves inward.

4. Cube Speaker Sweep Test

4.1 Apply an 11 Vrms, 20 Hz signal to the

input of the satellite. Change the applied signal

to 8 Vrms, 150 Hz. Sweep the oscillator from

150 Hz to 2 kHz.

4.2 Listen for rubs, ticks, air leaks, buzzes or

other extraneous noises.

Note: Defects such as rubs, ticks and air leaks

will typically be most audible during the 20 Hz

test. Defects such as buzzes will typically be

heard during the 150 Hz to 2 kHz sweep.

Note: The satellite cubes are not repairable.

The Jewel Cube

speakers are repairable.

5. Listening Test

5.1 Connect the cube speakers to the outputs

of the bass module.

5.2 Connect an audio source (i.e. CD player)

to the input of the A-D converter.

5.3 Perform procedure 1.1

5.4 Adjust the volume output of the audio

source to a comfortable level and listen for a

clean undistored audio output from the bass

module and cube speakers.