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11. Woofer Power Output Test
NOTE: Use the same test setup as Procedure
9,except remove the dB meter.
A. Connect a voltmeter across the 4
load.
NOTE: These measurements can be obtained at
120 and 240 V. Results will vary depending on the
line voltage used.
B. Adjust the oscillator to 100 Hz,555 mVrms.
C. Measure the voltage across the load. It should
be approximately 20.0 volts (100 watts). The
signal should look undistorted when viewed on an
oscilloscope.
Complete System Tests
NOTE: Use these procedures when a complete
FreeSpace™ business music system (module and
satellites) comes in to be serviced. All procedures
listed under Bass Module Test Procedures can
be used to test a complete system except as
indicated below.
1. System Phase Test
A. Use the procedures already listed for the
satellites and the module. Use Procedure #2
under Satellite Test Procedures and Procedure
#10 under Bass Module Test Procedures.
2. System Sweep Test
A. Use the procedures already given for the
satellites and the module,except use 185 mVrms
for both parts of the test. Use Procedure #1 under
Satellite Test Procedures and Procedure #1
Ω
resistive
under Bass Module Test Procedures. Make sure
that the satellites are connected to the bass
module.
3. Volume Control Test
A. Connect an oscillator to the module's L/R audio
input terminals. Adjust the oscillator to 4 kHz,185
mVrms.
B. Connect a set of satellites to either the 2 left or
the 2 right channels.
C. Attach the remote volume control to the
positive (+) and negative (-) volume control
terminals. At the 0 volume setting,the audio signal
should be faint or nonexistent,and at the
maximum volume setting,the audio signal should
be loud.
D. If there is no remote volume
control,momentarily short across the positive (+)
and negative (-) volume control terminals. The
signal should be faint or nonexistent.
22
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