Bose BUILT-INvisible TA-1 Service Manual page 24

Music Audio Tests
1. Front Channel Audio Tests
1.1 Set up the amplifier under test as outlined
in the test setup.
1.2 Apply a 100 mV, 1 kHz signal to the left
music audio input at J6 pins 1 and 2.
1.3 Reference a dB meter to the input level.
1.4 Measure the output level at the left front
speaker output at J12 pins 3 and 4. It should
be +34.6 dB + 1.5 dB.
1.5 Apply a 100 mV, 200 Hz signal to the left
music audio input at J6 pins 1 and 2.
1.6 Reference a dB meter to the input level.
1.7 Measure the output level at the left front
speaker output at J12 pins 3 and 4. It should
be +37.1 dB + 1.5 dB.
1.8 Apply a 100 mV, 12 kHz signal to the left
music audio input at J6 pins 1 and 2.
1.9 Reference a dB meter to the input level.
1.10 Measure the output level at the left front
speaker output at J12 pins 3 and 4. It should
be +39.0 dB + 1.5 dB.
1.11 Apply a 50 mV, 1 kHz signal to the left
music audio input at J6 pins 1 and 2.
1.12 Measure the small signal distortion
level at the left front speaker output at J12
pins 3 and 4. It should be < 0.5% THD+N.
1.13 Apply a 600 mV, 1 kHz signal to the left
music audio input at J6 pins 1 and 2.
1.14 Measure the large signal distortion
level at the left front speaker output at J12
pins 3 and 4. It should be < 0.2% THD+N.
TEST PROCEDURES
24
1.15 Apply a 1.8 Vrms, 1 kHz signal to the
left music audio input at J6 pins 1 and 2.
1.16 Measure the compressor signal distor-
tion level at the left front speaker output at
J12 pins 3 and 4. It should be < 2.0%
THD+N.
1.17 Repeat steps 1.2 to 1.16 for the right
music audio input, applying the signal at J6
pins 4 and 5 and measuring the output at
the right front speaker output at J12 pins
1 and 2.
2. Center Channel Audio Tests
2.1 Set up the amplifier under test as out-
lined in the test setup.
2.2 Apply an in-phase, 100 mV, 1 kHz signal
to the left and right music audio inputs at J6.
2.3 Reference a dB meter to the input level.
2.4 Measure the output level at the center
channel speaker output at J13 pins 1 and 2.
It should be +33.7 dB + 1.5 dB.
2.5 Apply an in-phase, 100 mV, 200 Hz
signal to the left and right music audio
inputs at J6.
2.6 Reference a dB meter to the input level.
2.7 Measure the output level at the center
channel speaker output at J13 pins 1 and 2.
It should be +37.7 dB + 1.5 dB.
2.8 Apply an in-phase, 100 mV, 12 kHz
signal to the left and right music audio
inputs at J6.
2.9 Reference a dB meter to the input level.
2.10 Measure the output level at the center
channel speaker output at J13 pins 1 and 2.
It should be +39.8 dB + 1.5 dB.