Bose LIFESTYLE 550 Service-Handbuch - Seite 14

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Bose LIFESTYLE 550 Service-Handbuch
7.3 Reference a dB meter to the output.
7.4 Check the response using the chart
below.
®
901
Response Chart
Frequency
Output
40Hz
+16dB
250Hz
0dB
Reference
700Hz
-7.0dB
10kHz
+16dB
14kHz
+21dB
TEST PROCEDURES
Tolerence
±2dB
----
±2dB
±2dB
±2dB
Figure 3. Amp Adjustment Location
14

8. Amplifier Adjustment Procedure

Note: Preheat the unit for about 20 minutes
prior to performing the following procedure.
8.1 Connect a DC voltmeter to the test
points TP 501-502 (across R536) for the
right channel and at TP 503-504 (across
R537) for the left channel see Figure3. for
the TP locations.
8.2 Connect the output to an 8 ohm load,
volume set to the minimum position, with no
signal applied.
8.3 Adjust VR452 for the right channel and
VR451 for the left channel to a setting of
7mV at the test points.