Bose Companion 3 Series II Manual de servicio - Página 23

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Test Equipment required:

1. Audio Signal Generator

2. Oscilloscope

3. Digital Multimeter

Test Set up

Connect the satellites to the output jacks on the bass module.

Connect the control pod to the DIN jack on the bass module.

Connect a signal generator to the audio input cable and connect the cable to the input jack on the

bass module.

1. Bass Module Air Leak test

1.1 Apply a 40 mVrms, 40 Hz signal to the input of the bass module.

1.2 Set the volume knob on the control pod to maximum (fully clockwise), and set the bass control to

the center detent (flat) position.

1.3 Listen carefully for air leaks along all glued joints, around the heat sink, connectors and at the

woofer mounting location.

1.4 Repair any air leaks around the heat sink and connectors. Replace any bass module that has air

leaks around the bass box or woofer mounting location.

2. Bass Module Sweep Test

2.1 Apply a 200 mVrms, 100 Hz signal to the input of the bass module.

2.2 Set the volume knob on the control pod to maximum (fully clockwise), and set the bass control to

the center detent (flat) position.

2.3 Listen carefully as you sweep the bass module from 100 Hz to 300 Hz, then from 300 Hz to 100

Hz.

2.4 Listen carefully for buzzes, rattles, or other extraneous noises from the woofer, cabinet, plastic

trim parts, or heat sink. A slight whooshing sound from the port at approximately 45 Hz is acceptable.

2.5 Repair any noise heard from around the heat sink and connectors. Replace the bass module if it

has noises from the woofer or cabinet area.

Test Procedures