Amplifier Adjustment Procedure; Amp Adjustment Location - Bose 550 Service Manual

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.