Bose ps28 48 performance test afs

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2 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 cables 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, its a rub or tick and the woofer should be replaced. If the noise stays the same, its 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.

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3 PS28/48 Performance Verification Procedures (With AV28 Media Center Console) Test Setup Using the Lifestyle ® 28/48 systems audio input cable part number 260351-001, connect the AV28 media center to the PS28/48 bass module. 1. Sweep Test 1.1 Apply a 200 mVrms, 25 Hz signal to the left and right AUX input of the AV28 media center. Adjust the AV28 media center to full volume. Listen for any extraneous noises such as rubbing, scraping, or ticking coming from the bass module. 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, its a rub or tick and the woofer should be replaced. If the noise stays the same, its normal suspension noise and it will not be heard with regular program material. 1.2 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 AUX input of the AV28 media center. 2.2 Check for air leaks from the bass module 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. Note: Connect the positive side of the dc supply to the positive input of the cube. Con- nect the negative side of the dc supply to the negative 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 directly to the input of the satellite. Change the applied signal to 8 Vrms, 150 Hz and the 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 Adjust the volume to a comfortable level and listen for a clean undistored audio output from the bass module and cube speakers.