Infinity BU-2, Technical Manual

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TEST PROCEDURE
Equipment needed:
n
Function/signal generator/sweep generator
n
Integrated Amplifier
n
Multimeter
n
Cables - line level (RCA) and speaker cables
General Function
UUT = Unit Under Test
1.
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.
2.
Turn on generator, adjust to 50mV, 50 Hz.
3.
Plug in UUT; red LED should be ON. Turn VOLUME
control full clockwise.
4.
LED should turn Green; immediate bass response should
be heard and felt from port tube opening.
5.
Turn off generator, turn VOLUME control fully
counterclockwise, disconnect RCA cables.
6.
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.
7.
Turn on generator and adjust so that speaker level output
is 2.0V, 50 Hz . Turn VOLUME control full clockwise.
8.
Green LED should light, immediate bass response should
be heard and felt from port tube opening.
Sweep Function
1.
Follow steps 1 - 4 above, using a sweep generator as a
signal source.
2.
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
1.
Remove driver from cabinet; and - wire clips.
2.
Check DC resistance of driver; it should be 3.3 ohms.
3.
Connect a pair of speaker cables to driver terminals.
Cables should be connected to an integrated amplifier fed by
a signal generator. Turn on 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.
3
Powered Subwoofer BU2
BU2 TEST PROCEDURE