Bu-150 Test Set Up And Procedure - Infinity BU-150 Service Manual

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Owner's manual (17 pages)

Table Of Contents

Table of Contents

Amplifier/Subwoofer

CD PLAYER

PRE AMP

AMPLIFIER

SPEAKER LEVEL

General Function

UUT = Unit Under Test

Connect both right and left line level inputs (RCA) to signal

generator and UUT. Use Y-cable if necessary from

mono source. VOLUME control should be full counterclockwise.

Turn on generator, adjust to 50mV, 50 Hz.

Plug in UUT; red LED should be ON. Turn VOLUME control

full clockwise. Low Pass control should be set fully clockwise (150)

LED should turn Green; immediate bass response should be

heard and felt from port tube opening.

Turn off generator, turn VOLUME control fully counterclockwise,

disconnect RCA cables.

Connect one pair of speaker cables to either high level input

terminal on UUT. Cables should be connected to

an integrated amplifier fed by the signal generator.

Turn on generator and adjust so that speaker level output is

2.0V, 50 Hz. Turn VOLUME control full clockwise.

Green LED should light, immediate bass response should be

heard and felt from the port tube opening.

Sweep Function

Follow steps 1-4 above, using a sweep generator as a signal source.

Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any

other noises. If any unusual noises are heard, remove driver and test.

Driver Function

Remove driver from cabinet; detach + and - wire clips.

Check DC resistance of driver; it should be 6.4 ohms.

Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by

a signal generator and adjust so that speaker level output is 5.0V.

4. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.