Bose Acoustimass 3 Series Panduan Servis - Halaman 23
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Halaman Cetak
Frequency
20 Hz
55 Hz
100 Hz
200 Hz
400 Hz
11. Bass Channel Dynamic EQ Gain
NOTE: Use the same test setup as Procedure 10.
A. Adjust the oscillator to 100 Hz,30 mVrms. Use
this as a reference point.
B. Adjust the oscillator to 55 Hz. There should be
a boost of approximately 5 dB. (a 3.0 dB
dB difference between the 30mV and the 200 mV
input level). Refer to the chart in the previous
procedure.
12. Woofer Power Output Test
NOTE: Use the same test setup as Procedure
10,except remove the dB meter. Make sure that
any test equipment connected to the woofer
output is floated (or isolated from ground).
Ω
A. Connect a 5
resistive load to the woofer
output. Connect a voltmeter across the load.
NOTE: These measurements can be obtained at
120 and 240 V. Results will vary depending on the
line voltage used.
B. Connect an oscillator to the module's L/R audio
input terminals. Adjust the oscillator to 100 Hz,345
mVrms.
Relative Response
-18.0 dB ± 2.0 dB
+1.8 dB ± 1.5 dB
0 dB
-0.5 dB ± 1.5 dB
-10.7 dB ± 1.5 dB
±
1.0
22
C. Measure the voltage across the load. It should
be approximately 15.8 volts (50 watts). The signal
should look undistorted when viewed on an
oscilloscope.
Complete System Tests
NOTE: Use these procedures when a complete
AM-3P system (module and satellites) comes in to
be serviced.
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
#9 under Module Test Procedures.
2. System Sweep Test
A. Use the procedures already given for the
satellites and the module,except use 220 mVrms
for both parts of the test. Use Procedure #1 under
Satellite Test Procedures and Procedure #2
under Module Test Procedures. Make sure that
the satellites are connected to the bass module.
3. All Other Tests
A. All other tests listed under Module Test
Procedures can be used to test a complete
system.